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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. For. Glob. Change</journal-id>
<journal-title>Frontiers in Forests and Global Change</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. For. Glob. Change</abbrev-journal-title>
<issn pub-type="epub">2624-893X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/ffgc.2025.1648754</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Forests and Global Change</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Shields of the shore: mangrove ecosystem shifts and climate vulnerability in Mozambique</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Foggia</surname>
<given-names>Camilla</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="corresp" rid="c001"><sup>&#x002A;</sup></xref>
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<contrib contrib-type="author">
<name>
<surname>Attorre</surname>
<given-names>Fabio</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
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<contrib contrib-type="author">
<name>
<surname>Bourgeois</surname>
<given-names>Carine</given-names>
</name>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
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<contrib contrib-type="author">
<name>
<surname>Candeago</surname>
<given-names>Elisabetta</given-names>
</name>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
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<contrib contrib-type="author">
<name>
<surname>Ramoni-Perazzi</surname>
<given-names>Paolo</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
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<contrib contrib-type="author">
<name>
<surname>Malatesta</surname>
<given-names>Luca</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
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<aff id="aff1"><sup>1</sup><institution>Department of Environmental Biology, University of Rome Sapienza</institution>, <addr-line>Rome</addr-line>, <country>Italy</country></aff>
<aff id="aff2"><sup>2</sup><institution>U.S. Forest Service International Programs and Trade</institution>, <addr-line>Kinshasa</addr-line>, <country>Democratic Republic of the Congo</country></aff>
<aff id="aff3"><sup>3</sup><institution>Department of Agriculture, Food, Environment and Forestry (DAGRI) University of Florence</institution>, <addr-line>Florence</addr-line>, <country>Italy</country></aff>
<aff id="aff4"><sup>4</sup><institution>Center of Simulation and Modeling, Engineering Faculty, University of the Andes</institution>, <addr-line>M&#x00E9;rida</addr-line>, <country>Venezuela</country></aff>
<author-notes>
<fn fn-type="edited-by" id="fn0001"><p>Edited by: <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/736320/overview">Soumendra Bhanja</ext-link>, Oak Ridge National Laboratory (DOE), United States</p></fn>
<fn fn-type="edited-by" id="fn0002"><p>Reviewed by: <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2647079/overview">Youssef M. Youssef</ext-link>, Suez University, Egypt</p><p><ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2989382/overview">Anselme Muzirafuti</ext-link>, University of Messina, Italy</p><p><ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/3133706/overview">Peter Gitau</ext-link>, Max Planck Institute of Geoanthropology, Germany</p>
</fn>
<corresp id="c001">&#x002A;Correspondence: Camilla Foggia, <email>camilla.foggia1998@gmail.com</email></corresp>
</author-notes>
<pub-date pub-type="epub">
<day>06</day>
<month>10</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="collection">
<year>2025</year>
</pub-date>
<volume>8</volume>
<elocation-id>1648754</elocation-id>
<history>
<date date-type="received">
<day>17</day>
<month>06</month>
<year>2025</year>
</date>
<date date-type="accepted">
<day>04</day>
<month>09</month>
<year>2025</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x00A9; 2025 Foggia, Attorre, Bourgeois, Candeago, Ramoni-Perazzi and Malatesta.</copyright-statement>
<copyright-year>2025</copyright-year>
<copyright-holder>Foggia, Attorre, Bourgeois, Candeago, Ramoni-Perazzi and Malatesta</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<sec>
<title>Introduction</title>
<p>Due to its vulnerability to climate-driven floods and storms, Mozambique faces significant challenges in coastal planning due to limited reliable data. In this context, studying mangrove cover and dynamics could provide valuable insights to enhance coastal area management.</p>
</sec>
<sec>
<title>Methods</title>
<p>This study introduces an innovative framework that assesses mangrove extent and coastal vulnerability by integrating the Mangrove Vegetation Index (MVI) with the InVEST Coastal Vulnerability model to accurately identify areas of highest priority for intervention. Using MVI applied to Landsat-8 (30 m) and Sentinel-2 (2023, resampled from 10 m to 30 m) imagery, we mapped mangrove cover for 2013 and 2023, refining accuracy by excluding pixels beyond 1.2 km inland and above 10 m elevation. A cloud-based workflow leveraging Google Earth Engine and QGIS enabled scalable, efficient analysis.</p>
</sec>
<sec>
<title>Results</title>
<p>The mangrove area declined from 2,116 km<sup>2</sup> in 2013 to 1,739 km<sup>2</sup> in 2023&#x2014;a 18% loss, equivalent to 1.8% annually. The results of the Coastal Vulnerability Model, applied to the entire coast of Mozambique, produced an Exposure Index (EI) for flooding and erosion events. Each point along the coast was classified with values from 1 to 5 at a distance of 100 m from each other: the highest values indicating greater exposure. It emerged that 16.2% of the 11,768.11 km of coastline were classified with an EI as &#x2018;Very Low&#x2019;, 42% as &#x2018;Low&#x2019;, 32% as &#x2018;Intermediate&#x2019;, 9.4% as &#x2018;High&#x2019; and 0.1% as &#x2018;Very High&#x2019;. Considering the points classified with a &#x2018;High&#x2019; and &#x2018;Very High&#x2019; EI, approximately 1,117.97 km of coastline is highly vulnerable and in need of intervention. Analysis of the impact of Cyclone Idai (2018&#x2013;2019) on the P&#x00FA;ngu&#x00E8; and Buzi River delta revealed a 69% reduction in mangrove cover, from 76&#x202F;km<sup>2</sup> to 23&#x202F;km<sup>2</sup>.</p>
</sec>
<sec>
<title>Discussion</title>
<p>These findings underscore the urgent need for targeted interventions, prioritizing Sofala and Zambezia for mangrove restoration and nature-based solutions to bolster coastal resilience. This scalable approach advances global mangrove monitoring and supports data-driven coastal management in climate-vulnerable regions.</p>
</sec>
</abstract>
<kwd-group>
<kwd>mangrove cover change</kwd>
<kwd>coastal vulnerability</kwd>
<kwd>cyclone impact</kwd>
<kwd>remote sensing</kwd>
<kwd>InVEST model</kwd>
</kwd-group>
<counts>
<fig-count count="6"/>
<table-count count="4"/>
<equation-count count="1"/>
<ref-count count="74"/>
<page-count count="16"/>
<word-count count="10879"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Tropical Forests</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="sec1">
<label>1</label>
<title>Introduction</title>
<p>Salt-tolerant mangrove ferns, palms and woody plants, thrive in tropical and subtropical intertidal zones and form vital interfaces between land and sea along sheltered coastlines, estuaries, and deltas (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>; <xref ref-type="bibr" rid="ref60">Saenger and Saenger, 2002</xref>; <xref ref-type="bibr" rid="ref23">FAO, 2007</xref>). Their unique adaptations such as prop roots and pneumatophores for structural support and gas exchange, porous tissues for efficient oxygen diffusion, salt-exclusion mechanisms, and buoyant propagules for water dispersal, are key to their survival in saline, waterlogged, and tidal environments (<xref ref-type="bibr" rid="ref48">Lugo and Snedaker, 1974</xref>; <xref ref-type="bibr" rid="ref58">Rabinowitz, 1978</xref>; <xref ref-type="bibr" rid="ref72">Wang et al., 2011</xref>; <xref ref-type="bibr" rid="ref22">Duke and Schmitt, 2015</xref>). These traits also shape clear zonation patterns across intertidal gradients, which in turn support ecosystem resilience and functional diversity (<xref ref-type="bibr" rid="ref47">Lugo et al., 1975</xref>; <xref ref-type="bibr" rid="ref20">Duke et al., 1998</xref>).</p>
<fig position="float" id="fig1">
<label>Figure 1</label>
<caption>
<p>Map of Mozambique showing the main hydrographic network. The map shows the administrative division of the country into provinces, outlined in black, and the network of main waterways (blue lines). The altimetry is represented by a 30-meter resolution SRTM Digital Elevation Model (DEM). The countries bordering Mozambique and the Indian Ocean to the east are also shown. The map is georeferenced with geographic coordinates in decimal degrees (WGS 84).</p>
</caption>
<graphic xlink:href="ffgc-08-1648754-g001.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">Map of Mozambique showing provincial boundaries, major rivers, and surrounding countries. Provinces include Niassa, Cabo Delgado, Nampula, Zambezia, Tete, Manica, Sofala, Inhambane, Gaza, and Maputo. Elevation is color-coded, with higher elevations in orange and lower elevations in yellow. Surrounding countries are Zambia, Malawi, Tanzania, Zimbabwe, South Africa, and Eswatini. The Indian Ocean is east of Mozambique.</alt-text>
</graphic>
</fig>
<fig position="float" id="fig2">
<label>Figure 2</label>
<caption>
<p>Workflow for generating MVI-based mangrove maps from Sentinel-2 and Landsat-8 imagery. The process uses atmospherically corrected images as inputs, combining the green, SWIR1, and NIR bands to produce the MVI output in Google Earth Engine. A thresholding step separates mangrove pixels from other land cover classes. The resulting mangrove layer is then exported to QGIS for noise removal, map layout preparation, and statistical analysis.</p>
</caption>
<graphic xlink:href="ffgc-08-1648754-g002.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">Flowchart illustrating the selection and processing of Sentinel-2 images for mapping mangrove extents in Mozambique. It starts with the Selection of AOI, moves to image correction and MVI generation. A threshold filters mangrove from non-mangrove pixels. Distance to coast and DEM are used to further classify non-mangrove and mangrove areas. Results are exported in QGIS to create final maps.</alt-text>
</graphic>
</fig>
<fig position="float" id="fig3">
<label>Figure 3</label>
<caption>
<p>Mangrove cover distribution along Mozambique coastline in 2013 <bold>(a)</bold> and in 2023 <bold>(b)</bold>.</p>
</caption>
<graphic xlink:href="ffgc-08-1648754-g003.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">Two maps of Mozambique show mangrove distribution. The left map depicts mangroves in 2013 with orange lines along the coast. The right map shows mangroves in 2023 with green lines. Mangroves are primarily along the eastern coast from Cabo Delgado to Maputo City, indicating changes over the decade.</alt-text>
</graphic>
</fig>
<fig position="float" id="fig4">
<label>Figure 4</label>
<caption>
<p>Variation in the EI along the coast of Mozambique in 2023. Values generated using the Coastal Vulnerability Model (available in InVEST software). The higher the EI values, the greater the exposure of that portion of the coastline to flooding and erosion events.</p>
</caption>
<graphic xlink:href="ffgc-08-1648754-g004.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">Map of Mozambique showing coastal vulnerability. The coastline is color-coded by exposure index: very low (purple), low (blue), intermediate (green), high (yellow), and very high (red). Regions labeled include Niassa, Cabo Delgado, Nampula, Zambezia, Tete, Manica, Sofala, Inhambane, Gaza, and Maputo. An arrow indicates north.</alt-text>
</graphic>
</fig>
<fig position="float" id="fig5">
<label>Figure 5</label>
<caption>
<p>Percentages of the total Mozambican coastline under different levels of EI in 2023. Values generated using the coastal vulnerability model, available in the InVEST software.</p>
</caption>
<graphic xlink:href="ffgc-08-1648754-g005.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">Bar chart showing the distribution of Exposure Index (EI) groups in Mozambique. The largest group, 1.8 to 2.6, is 42.2 percent. The next largest, 2.6 to 3.4, is 32 percent. Groups 1.0 to 1.8, 3.4 to 4.2, and 4.2 to 5.0 are 16.2 percent, 9.4 percent, and 0.1 percent, respectively.</alt-text>
</graphic>
</fig>
<fig position="float" id="fig6">
<label>Figure 6</label>
<caption>
<p>Mangrove cover distribution <bold>(a)</bold> before and <bold>(b)</bold> after the passage of Cyclone Idai, illustrating the cyclone&#x2019;s impact.</p>
</caption>
<graphic xlink:href="ffgc-08-1648754-g006.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">Two maps compare mangrove cover along the Buzi River in Mozambique before and after Cyclone Idai. Map (a) from 2018 shows extensive mangrove coverage in cyan. Map (b) from 2019 shows reduced mangrove coverage in magenta.</alt-text>
</graphic>
</fig>
<table-wrap position="float" id="tab1">
<label>Table 1</label>
<caption>
<p>MVI formulas used for Sentinel-2 and Landsat-8 OLI imagery (after <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>).</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">Type of MVI formula</th>
<th align="left" valign="top">Formula</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">Generic Formula</td>
<td align="left" valign="top">
<inline-formula>
<mml:math id="M1">
<mml:mi mathvariant="italic">MVI</mml:mi>
<mml:mo>=</mml:mo>
<mml:mo stretchy="true">(</mml:mo>
<mml:mi mathvariant="italic">NIR</mml:mi>
<mml:mo>&#x2212;</mml:mo>
<mml:mtext mathvariant="italic">Green</mml:mtext>
<mml:mo stretchy="true">)</mml:mo>
<mml:mo>/</mml:mo>
<mml:mo stretchy="true">(</mml:mo>
<mml:mtext mathvariant="italic">SWIR</mml:mtext>
<mml:mo>&#x2212;</mml:mo>
<mml:mtext mathvariant="italic">Green</mml:mtext>
<mml:mo stretchy="true">)</mml:mo>
</mml:math>
</inline-formula>
</td>
</tr>
<tr>
<td align="left" valign="top">Applied to Sentinel-2 images</td>
<td align="left" valign="top">
<inline-formula>
<mml:math id="M2">
<mml:mtext mathvariant="italic">Sentinel</mml:mtext>
<mml:mn>2</mml:mn>
<mml:mi mathvariant="italic">MVI</mml:mi>
<mml:mo>=</mml:mo>
<mml:mo stretchy="true">(</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>8</mml:mn>
<mml:mo>&#x2212;</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>3</mml:mn>
<mml:mo stretchy="true">)</mml:mo>
<mml:mo>/</mml:mo>
<mml:mo stretchy="true">(</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>11</mml:mn>
<mml:mo>&#x2212;</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>3</mml:mn>
<mml:mo stretchy="true">)</mml:mo>
</mml:math>
</inline-formula>
</td>
</tr>
<tr>
<td align="left" valign="top">Applied to Landsat-8 OLI images</td>
<td align="left" valign="top">
<inline-formula>
<mml:math id="M3">
<mml:mtext mathvariant="italic">Landsat</mml:mtext>
<mml:mn>8</mml:mn>
<mml:mi mathvariant="italic">MVI</mml:mi>
<mml:mo>=</mml:mo>
<mml:mo stretchy="true">(</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>5</mml:mn>
<mml:mo>&#x2212;</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>3</mml:mn>
<mml:mo stretchy="true">)</mml:mo>
<mml:mo>/</mml:mo>
<mml:mo stretchy="true">(</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>6</mml:mn>
<mml:mo>&#x2212;</mml:mo>
<mml:mi>B</mml:mi>
<mml:mn>3</mml:mn>
<mml:mo stretchy="true">)</mml:mo>
</mml:math>
</inline-formula>
</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<p>For Sentinel-2, the MVI uses Band 3 (green, 560&#x202F;nm), Band 8 (near-infrared, 842&#x202F;nm), and Band 11 (shortwave infrared 1, 1,610&#x202F;nm). For Landsat-8 OLI, it uses Band 3 (green, 533&#x2013;590&#x202F;nm), Band 5 (near-infrared, 851&#x2013;879&#x202F;nm), and Band 6 (shortwave infrared 1, 1,566&#x2013;1,651&#x202F;nm). The green band captures vegetation reflectance, the NIR band highlights vegetation vigor, and the SWIR1 band provides information on vegetation moisture content, enabling effective discrimination of mangrove forests.</p>
</table-wrap-foot>
</table-wrap>
<table-wrap position="float" id="tab2">
<label>Table 2</label>
<caption>
<p>Description of datasets used in this study to calculate the coastal vulnerability model.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">Dataset</th>
<th align="left" valign="top">Type</th>
<th align="left" valign="top">Source</th>
<th align="left" valign="top">Processed data</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">Mangrove</td>
<td align="left" valign="top">Raster</td>
<td align="left" valign="top">Mangrove cover in 2023 at 10&#x202F;m resolution, previously calculated through MVI formula.</td>
<td align="left" valign="top" rowspan="2">From this dataset it was extracted both the coral reef shapefile and the seagrass<break/>shapefile.</td>
</tr>
<tr>
<td align="left" valign="top">Coral Reef</td>
<td align="left" valign="top">Shapefile</td>
<td align="left" valign="top">
<ext-link xlink:href="http://geoportal.rcmrd.org/layers/servir%3Amozambique_seagrass" ext-link-type="uri">http://geoportal.rcmrd.org/layers/servir%3Amozambique_seagrass</ext-link>
</td>
</tr>
<tr>
<td align="left" valign="top">AOI</td>
<td align="left" valign="top">Shapefile</td>
<td align="left" valign="top" rowspan="2">
<ext-link xlink:href="https://data.humdata.org/dataset" ext-link-type="uri">https://data.humdata.org/dataset/cod-ab-moz?#</ext-link>
</td>
<td align="left" valign="top" rowspan="2">From the dataset of Mozambique administrative boundaries of level 1 (provinces), it was extracted the Area for Interest of each Province, the landmasses and the coastal buffer that was used to extract the coastal forests.<break/>For the original level 1 administrative boundary file, the boundaries toward the coast were redrawn with QGIS software, delineating the coastline accurately and entering the rivers.</td>
</tr>
<tr>
<td align="left" valign="top">Landmasses</td>
<td align="left" valign="top">Shapefile</td>
</tr>
<tr>
<td align="left" valign="top">Continental Shelf Polyline</td>
<td align="left" valign="top">Shapefile</td>
<td align="left" valign="top">Provided by InVEST sample data</td>
<td align="left" valign="top">/</td>
</tr>
<tr>
<td align="left" valign="top">WAWEWATCHIII</td>
<td align="left" valign="top">Shapefile</td>
<td align="left" valign="top">Provided by InVEST sample data</td>
<td align="left" valign="top">/</td>
</tr>
<tr>
<td align="left" valign="top">Population</td>
<td align="left" valign="top">Raster</td>
<td align="left" valign="top">WorldPop Global Project Population Data: Estimated Residential Population per<break/>100x100m Grid Square</td>
<td align="left" valign="top">Raster at 100&#x202F;m resolution, downloaded from Google Earth Engine.</td>
</tr>
<tr>
<td align="left" valign="top">DEM</td>
<td align="left" valign="top">Raster</td>
<td align="left" valign="top">Copernicus DEM GLO-30: Global 30&#x202F;m Digital Elevation Model</td>
<td align="left" valign="top">Raster at 30&#x202F;m resolution, downloaded from Google Earth Engine.</td>
</tr>
<tr>
<td align="left" valign="top">Bathymetry</td>
<td align="left" valign="top">Raster</td>
<td align="left" valign="top">
<ext-link xlink:href="https://www.gebco.net/data_and_products/gridded_bathymetry_data/" ext-link-type="uri">https://www.gebco.net/data_and_products/gridded_bathymetry_data/</ext-link>
</td>
<td align="left" valign="top">/</td>
</tr>
<tr>
<td align="left" valign="top">Coastal Forests</td>
<td align="left" valign="top">Raster</td>
<td align="left" valign="top">
<ext-link xlink:href="https://dynamicworld.app/" ext-link-type="uri">https://dynamicworld.app/</ext-link>
</td>
<td align="left" valign="top">From this file it was extracted the class &#x201C;trees.&#x201D; After that, using the DEM were selected the trees under 100&#x202F;m altitude. In the end,using a coastal buffer of 500&#x202F;m, was finally clipped the raster of trees to create a file with the coastal forests.</td>
</tr>
</tbody>
</table>
</table-wrap>
<table-wrap position="float" id="tab3">
<label>Table 3</label>
<caption>
<p>Range of EI values calculated through the InVEST coastal vulnerability model (Natural Capital Project, 2025) used in Mozambique&#x2019;s coastal vulnerability classification.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top" colspan="3">Exposure index</th>
<th align="center" valign="top">HTML notation</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">
<inline-graphic xlink:href="ffgc-08-1648754-i001.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">A small, solid dark purple circle on a white background.</alt-text>
</inline-graphic>
</td>
<td align="center" valign="top">1.0&#x2013;1.8</td>
<td align="center" valign="top"><italic>Very low</italic></td>
<td align="center" valign="top"><italic>#440154</italic></td>
</tr>
<tr>
<td align="left" valign="top">
<inline-graphic xlink:href="ffgc-08-1648754-i002.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">A solid blue circle.</alt-text>
</inline-graphic>
</td>
<td align="center" valign="top">1.8&#x2013;2.6</td>
<td align="center" valign="top"><italic>Low</italic></td>
<td align="center" valign="top"><italic>#3b528b</italic></td>
</tr>
<tr>
<td align="left" valign="top">
<inline-graphic xlink:href="ffgc-08-1648754-i003.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">A small, solid green circle against a white background.</alt-text>
</inline-graphic>
</td>
<td align="center" valign="top">2.6&#x2013;3.4</td>
<td align="center" valign="top"><italic>Intermediate</italic></td>
<td align="center" valign="top"><italic>#21908d</italic></td>
</tr>
<tr>
<td align="left" valign="top">
<inline-graphic xlink:href="ffgc-08-1648754-i004.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">A small bright green circle on a white background.</alt-text>
</inline-graphic>
</td>
<td align="center" valign="top">3.4&#x2013;4.2</td>
<td align="center" valign="top"><italic>High</italic></td>
<td align="center" valign="top"><italic>#5&#x202F;dc963</italic></td>
</tr>
<tr>
<td align="left" valign="top">
<inline-graphic xlink:href="ffgc-08-1648754-i005.tif" mimetype="image" mime-subtype="tiff">
<alt-text content-type="machine-generated">Yellow circle on a white background.</alt-text>
</inline-graphic>
</td>
<td align="center" valign="top">4.2&#x2013;5</td>
<td align="center" valign="top"><italic>Very High</italic></td>
<td align="center" valign="top"><italic>#fde725</italic></td>
</tr>
</tbody>
</table>
</table-wrap>
<table-wrap position="float" id="tab4">
<label>Table 4</label>
<caption>
<p>Changes in mangrove cover (km<sup>2</sup>) in Mozambique between 2013 and 2023.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">Province</th>
<th align="center" valign="top">Year 2013</th>
<th align="center" valign="top">Year 2023</th>
<th align="center" valign="top">Difference between years</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">Maputo</td>
<td align="center" valign="top">41.39 Km<sup>2</sup></td>
<td align="center" valign="top">36.38 Km<sup>2</sup></td>
<td align="center" valign="top">&#x2013;5.01 Km<sup>2</sup></td>
</tr>
<tr>
<td align="left" valign="top">Gaza</td>
<td align="center" valign="top">2.75 Km<sup>2</sup></td>
<td align="center" valign="top">3.23 Km<sup>2</sup></td>
<td align="center" valign="top">+ 0.48 Km<sup>2</sup></td>
</tr>
<tr>
<td align="left" valign="top">Inhambane</td>
<td align="center" valign="top">156.21 Km<sup>2</sup></td>
<td align="center" valign="top">152.75 Km<sup>2</sup></td>
<td align="center" valign="top">&#x2013;3.46 Km<sup>2</sup></td>
</tr>
<tr>
<td align="left" valign="top">Sofala</td>
<td align="center" valign="top">450.89 Km<sup>2</sup></td>
<td align="center" valign="top">366.49 Km<sup>2</sup></td>
<td align="center" valign="top">&#x2013;84.4 Km<sup>2</sup></td>
</tr>
<tr>
<td align="left" valign="top">Zambezia</td>
<td align="center" valign="top">812.56 Km<sup>2</sup></td>
<td align="center" valign="top">554.19 Km<sup>2</sup></td>
<td align="center" valign="top">&#x2013;258.37 Km<sup>2</sup></td>
</tr>
<tr>
<td align="left" valign="top">Nampula</td>
<td align="center" valign="top">369.61 Km<sup>2</sup></td>
<td align="center" valign="top">338.29 Km<sup>2</sup></td>
<td align="center" valign="top">&#x2013;31.32 Km<sup>2</sup></td>
</tr>
<tr>
<td align="left" valign="top">Cabo Delgado</td>
<td align="center" valign="top">280.89 Km<sup>2</sup></td>
<td align="center" valign="top">287.23 Km<sup>2</sup></td>
<td align="center" valign="top">+ 6.34 Km<sup>2</sup></td>
</tr>
<tr>
<td align="left" valign="top">Total</td>
<td align="center" valign="top">2,114.30 Km<sup>2</sup></td>
<td align="center" valign="top">1,738.56 Km<sup>2</sup></td>
<td align="center" valign="top">&#x2013;375.74 Km<sup>2</sup></td>
</tr>
</tbody>
</table>
</table-wrap>
<p>As one of the planet&#x2019;s most productive ecosystems, mangroves support exceptional biodiversity, by serving as critical nursery habitats for countless marine species, and providing critical habitat for migratory birds (<xref ref-type="bibr" rid="ref21">Duke et al., 2007</xref>; <xref ref-type="bibr" rid="ref23">FAO, 2007</xref>; <xref ref-type="bibr" rid="ref65">Spalding and Leal, 2024</xref>). Moreover, mangroves trap sediments, organic matter, and pollutants through dense canopies and root networks (<xref ref-type="bibr" rid="ref67">Tam and Wong, 1993</xref>), contributing significantly to carbon sequestration, averaging 394 tons per hectare, with peaks of 650 tons in high-density areas (<xref ref-type="bibr" rid="ref65">Spalding and Leal, 2024</xref>). Socioeconomically, mangroves provide vital resources for coastal communities, valued between USD 200,000 and 900,000 per km<sup>2</sup> annually (<xref ref-type="bibr" rid="ref68">UNEP-WCMC, 2006</xref>; <xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>). They also offer seafood, fuelwood, fibers, construction materials, honey, edible leaves, medicinal plants, and even ground for ecotourism, thereby supporting food security, livelihoods, and local economies (<xref ref-type="bibr" rid="ref59">R&#x00F6;nnb&#x00E4;ck, 1999</xref>; <xref ref-type="bibr" rid="ref6">Barbier, 2000</xref>; <xref ref-type="bibr" rid="ref68">UNEP-WCMC, 2006</xref>; <xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>; <xref ref-type="bibr" rid="ref43">Lee et al., 2014</xref>; <xref ref-type="bibr" rid="ref26">Friess, 2017</xref>; <xref ref-type="bibr" rid="ref31">Goldberg et al., 2020</xref>).</p>
<p>Mangroves are fundamental to coastal protection, particularly as climate change intensifies storm activity (<xref ref-type="bibr" rid="ref51">McIvor et al., 2015</xref>). Their structural complexity slows water flow, reduces wave energy, and mitigates storm surge impacts, lessening flood and erosion risks across tropical shorelines (<xref ref-type="bibr" rid="ref49">Massel et al., 1999</xref>; <xref ref-type="bibr" rid="ref50">Mazda et al., 2006</xref>; <xref ref-type="bibr" rid="ref8">Barbier et al., 2011</xref>; <xref ref-type="bibr" rid="ref10">Blankespoor et al., 2017</xref>). Broad mangrove belts spanning several kilometers buffer wave energy and floodwater, while even smaller stands provide measurable protection to nearby areas (<xref ref-type="bibr" rid="ref65">Spalding and Leal, 2024</xref>).</p>
<p>Mozambique hosts Africa&#x2019;s second-largest mangrove coverage, approximately 54.6% of its 11,768 km coastline, offering vital protective functions and supporting high species diversity, with 9&#x2013;10 species recorded (<xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>; <xref ref-type="bibr" rid="ref30">Global Mangrove Watch, 2024</xref>; <xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>). However, besides the significant degradation driven by aquaculture, urban expansion, land reclamation, and unsustainable logging, mangrove loss is further aggravated by sea level rise, cyclones, and extreme rainfall (<xref ref-type="bibr" rid="ref24">Farnsworth and Ellison, 1997</xref>; <xref ref-type="bibr" rid="ref29">Giri et al., 2008</xref>; <xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). Globally, mangrove cover has declined by roughly one-third over the past five decades, with Mozambique experiencing sharp losses&#x2014;particularly after Cyclone Idai (2019), a Category 4 storm that caused widespread ecological and human devastation (<xref ref-type="bibr" rid="ref64">Spalding et al., 1997</xref>; <xref ref-type="bibr" rid="ref46">Lovelock et al., 2015</xref>; <xref ref-type="bibr" rid="ref19">Devi, 2019</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>). With tropical cyclones accounting for 45% of global mangrove mortality in the last 60&#x202F;years, and projections indicating increased frequency and intensity, growing risks to both ecosystems and human settlements are anticipated (<xref ref-type="bibr" rid="ref39">Hoque et al., 2018</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>; <xref ref-type="bibr" rid="ref55">Phiri et al., 2021</xref>). The intrusion of salt water inland is a direct consequence of climate change, mainly linked to rising sea levels. In this context, it has been documented that mangroves have the ability to migrate inland when conditions are favorable in terms of ecological timing and availability of suitable soil (<xref ref-type="bibr" rid="ref71">Visschers et al., 2022</xref>). In addition, while mangroves are threatened by seawater intrusion (flooding and sea level rise), they are also often threatened by altered freshwater inflows from inland areas (e.g., dam construction that alters water flow and pollutants).</p>
<p>The conservation of these ecosystems is imperative; deforestation or natural erosion not only put these carbon stocks at risk, but also risk releasing significant amounts of greenhouse gases into the atmosphere, thus aggravating climate change. Protecting mangroves is essential to sustain their role in global carbon sequestration and to prevent further acceleration of climate impacts (<xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>; <xref ref-type="bibr" rid="ref12">Bourgeois et al., 2024</xref>).</p>
<p>Accelerating mangrove loss and intensifying climate threats highlight the urgent need for research to guide conservation and restoration efforts. Nature-based Solutions that restore ecosystem function and enhance coastal resilience are essential, particularly as coastal regions face growing erosion and flooding risks from storms and sea-level rise. Understanding and preserving the protective role of natural habitats is critical for sustainable coastal management, aligning with global goals like the SDGs and regional initiatives under the UNEP-Nairobi Convention (<xref ref-type="bibr" rid="ref11">Bosire et al., 2015</xref>; <xref ref-type="bibr" rid="ref66">Tallis et al., 2015</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>).</p>
<p>In the present study we examine the spatial and temporal dynamics of degradation, evaluate mangroves&#x2019; protective capacity against floods and erosion, and explore strategies to maintain their ecological and socioeconomic value. Through this work, we aim to support Mozambique&#x2019;s efforts to protect vulnerable coastlines and strengthen coastal communities facing increasing climate-related challenges.</p>
<p>Several studies have assessed the extent and condition of Mozambique&#x2019;s mangroves over the past three decades, using diverse methods ranging from aerial surveys (<xref ref-type="bibr" rid="ref61">Saket and Matusse, 1994</xref>) and field-based inventories (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>) to satellite remote sensing (<xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>) combined Landsat ETM&#x202F;+&#x202F;and Shuttle Radar Topography Mission data to estimate mangrove extent, height, and biomass, while <xref ref-type="bibr" rid="ref14">Charrua et al. (2020)</xref> used field data and environmental parameters to model the distribution of mangrove forests and an EI to climate hazards and erosion. <xref ref-type="bibr" rid="ref15">Charrua et al. (2021)</xref> used Landsat time-series analysis to analyze temporal changes in Land Use and Land Cover (LULC) after the passage of Cyclone Idai across Sofala Province. More recently, the <xref ref-type="bibr" rid="ref30">Global Mangrove Watch (2024)</xref> has produced global baseline maps at 30&#x202F;m resolution. Although these studies provide valuable insights into mangrove dynamics, they differ in scale, resolution, and methodological consistency, limiting their utility for long-term, standardized national monitoring. Moreover GIS and remote sensing have been effectively used for produce datasets used multi-criteria decision analyses (MCDA) in the context of land use planning, such as forest fire (<xref ref-type="bibr" rid="ref2">Akay and Erdo&#x011F;an, 2017</xref>), protected areas management (<xref ref-type="bibr" rid="ref53">Nelson and Burnside, 2019</xref>), evaluation of environmental hazards (<xref ref-type="bibr" rid="ref4">Arabameri et al., 2019</xref>; <xref ref-type="bibr" rid="ref17">Darwish, 2023</xref>). However this approach is never been applied in mangroves ecosystems in Mozambique, as highlighted by <xref ref-type="bibr" rid="ref27">Frosi et al. (2025)</xref>. By integrating the Mangrove MVI with the InVEST (see <xref rid="app1" ref-type="app">Appendix</xref>) Coastal Vulnerability Model, our study addresses these gaps, offering a novel framework to assess both mangrove cover change and coastal vulnerability in Mozambique at high spatial resolution.</p>
</sec>
<sec sec-type="materials|methods" id="sec2">
<label>2</label>
<title>Materials and methods</title>
<sec id="sec3">
<label>2.1</label>
<title>Study area</title>
<sec id="sec4">
<label>2.1.1</label>
<title>Geography and socio-economic context</title>
<p>Mozambique, located in southeast Africa and bordering six countries and the Indian Ocean, between 10&#x00B0;20&#x2019;S and 26&#x00B0;50&#x2019;S, spans 800,000 km<sup>2</sup> across 11 provinces (<xref ref-type="fig" rid="fig1">Figure 1</xref>). Approximately 70% of the population lives in rural areas, with 40% concentrated in Nampula and Zamb&#x00E9;zia provinces (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). Coastal resources (fisheries, agriculture, and forestry) support ~66% of coastal populations and contribute significantly to the national economy (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>).</p>
<p>Mozambique features 11 major rivers, including the Zambezi and Limpopo, and contains ~104 river basins that support mangrove ecosystems (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). The country has Africa&#x2019;s third-longest coastline, with diverse habitats including beaches, dunes, coral reefs, and mangroves forests (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>; <xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>). The climate is tropical (subtropical in the south), with a rainy season (November&#x2013;March) and dry season (April&#x2013;October; <xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>). The northern climate is influenced by equatorial low-pressure systems, the southern by subtropical anticyclones, and the central by the Intertropical Convergence Zone (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). Wind patterns vary regionally, with monsoons in the north and southeasterly trade winds in the south (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). Tropical cyclones occur from November to April, peaking in January&#x2013;February, with an average of 1.16 landfalls per year (1980&#x2013;2007) and increasing intensity since 1993 (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>).</p>
</sec>
<sec id="sec5">
<label>2.1.2</label>
<title>Mangroves in Mozambique</title>
<p>Mozambique&#x2019;s coastline harbors a mangrove forests with estimated extents ranging from approximately 2,909&#x202F;km<sup>2</sup> (<xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>) to 3,960.80 Km<sup>2</sup> (<xref ref-type="bibr" rid="ref61">Saket and Matusse, 1994</xref>), likely due to differences in estimation methods. The most recent estimate of mangrove coverage in Mozambique is 3,380.27&#x202F;km<sup>2</sup> as of 2020, reported by the <xref ref-type="bibr" rid="ref30">Global Mangrove Watch (2024)</xref>. These mangroves occur along three main coastal regions (<xref ref-type="bibr" rid="ref38">Hoguane and Armando, 2015</xref>). First, the Northern Rocky Coast (Ruvuma River, 10&#x00B0;S, 40&#x00B0;27&#x2019;E to Angoche River, 16&#x00B0;12&#x2019;S, 39&#x00B0;54&#x2019;E) features shallow reefs with hermatypic corals and mangroves in sheltered bays and estuaries. Second, the Central Swampy Coast (Angoche to Save River, 20&#x00B0;52&#x2019;S, 35&#x00B0;30&#x2019;E) encompasses the Sofala Bank&#x2014;a key fishing area&#x2014;supports extensive, well-preserved mangrove forests growing on organic mud and freshwater inflows. These include the tallest mangroves in Mozambique (<xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>). Finally, the Southern Sandy Dune Coast (Save River to Ponta do Ouro, 26&#x00B0;30&#x2019;S, 32&#x00B0;24&#x2032;E) includes cooler sandy dunes, the Bazaruto Archipelago, and Maputo Bay, a major mangrove area fed by four large rivers (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>).</p>
<p>In Mozambique, mangroves provide essential ecological, economic, and environmental benefits. They act as natural coastal buffers against erosion, storms, and tides, and support commercially important fish and shrimp species (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>; <xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>). Mangrove-associated fishing contributes around 40% of Mozambique&#x2019;s GDP, with shrimp fishing alone generating $55.4 million annually (<xref ref-type="bibr" rid="ref52">MICOA, 1998</xref>). Coastal areas are also attracting growing interest for development in agriculture, aquaculture, bioenergy, tourism and related infrastructures (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>).</p>
<p>However, mangroves face both anthropogenic and natural threats: overharvesting for fuel and construction materials, clearing for agriculture and salt production, pollution, reduced freshwater inflow due to dams (e.g., Cahora Bassa), hurricanes, industrial development, and population influx (<xref ref-type="bibr" rid="ref61">Saket and Matusse, 1994</xref>; <xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>; <xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>). In urban areas such as Maputo and Beira, approximately 1,821 hectares are lost annually, with reports of oil spills and heavy metal contamination (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>). In Mossuril, 50% of mangroves have been converted to salt pans (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>). Dams exacerbate saltwater intrusion and erosion, while unsustainable tourism and high coastal population density further drive mangrove degradation (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>).</p>
</sec>
<sec id="sec6">
<label>2.1.3</label>
<title>Mozambican legislation about mangroves</title>
<p>Mangrove governance in Mozambique is regulated by more than 20 legal instruments, creating a fragmented and sometimes contradictory framework. While mangroves benefit from direct and indirect protection, legislation simultaneously allows industrial and extractive activities under special licenses or &#x201C;national interest,&#x201D; often undermining conservation goals. Weak enforcement of Environmental Management Plans and overlapping institutional mandates further add to governance confusion. Recent reforms mark important progress: the 2023 Forest Law reclassifies mangroves as conservation forests (<xref ref-type="bibr" rid="ref35">Government of Mozambique, 2023</xref>), and the Maritime Law (<xref ref-type="bibr" rid="ref33">Government of Mozambique, 2019</xref>) criminalizes unauthorized destruction. The 2020&#x2013;2024 Mangrove Management Strategy and community-based mechanisms also strengthen participatory governance (<xref ref-type="bibr" rid="ref34">Government of Mozambique, 2020</xref>). Nonetheless, limited institutional capacity and fragmented policies continue to constrain effective conservation, highlighting the need for legal coherence and stronger community rights in line with international commitments (<xref ref-type="bibr" rid="ref73">WWF, 2024</xref>).</p>
</sec>
<sec id="sec7">
<label>2.1.4</label>
<title>Climate risks and coastal vulnerability</title>
<p>An increasing number of people live in coastal areas characterized by high geophysical and biophysical vulnerability (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). It is therefore essential to equip coastal planners with tools to develop effective management plans that mitigate the growing risks posed by coastal climate hazards to both life and infrastructure (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>).</p>
<p>Mozambique&#x2019;s extensive coastline and mangroves are particularly vulnerable to climate risks such as cyclones and flooding (<xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>), due to both its geographical location and low coastal elevation in some areas. The central region (Sofala) is the most cyclone-prone, featuring a wide tidal range and vast plains (<xref ref-type="bibr" rid="ref15">Charrua et al., 2021</xref>). The cyclone season (November&#x2013;April) sees 3&#x2013;12 cyclones annually in the Mozambique Channel, with landfall frequency rising since the 2000s (<xref ref-type="bibr" rid="ref15">Charrua et al., 2021</xref>; <xref ref-type="bibr" rid="ref16">Chichava et al., 2024</xref>). Notable cyclones include Idai (2019) caused over 1,000 deaths, more than 1,600 injuries, and $3.2 billion in damages (<xref ref-type="bibr" rid="ref15">Charrua et al., 2021</xref>; <xref ref-type="bibr" rid="ref55">Phiri et al., 2021</xref>). With about 60% of the population lives along the coast, Mozambique ranks 10th globally and 3rd in Africa in terms of climate vulnerability (<xref ref-type="bibr" rid="ref16">Chichava et al., 2024</xref>). Improved disaster management&#x2014;including mapping and early warning systems&#x2014;is critical for reducing the impacts of such events (<xref ref-type="bibr" rid="ref55">Phiri et al., 2021</xref>; <xref ref-type="bibr" rid="ref42">Lee et al., 2019</xref>).</p>
</sec>
</sec>
<sec id="sec8">
<label>2.2</label>
<title>Mangrove vegetation index</title>
<p>Recent mangrove declines highlight the critical need to map and monitor these ecosystems to understand their historical and current distributions, identify threats, and guide territorial planning (<xref ref-type="bibr" rid="ref45">Liu et al., 2008</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). Remote sensing offers significant advantages over traditional field surveys, which are time-consuming, costly, and spatially limited (<xref ref-type="bibr" rid="ref45">Liu et al., 2008</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>).</p>
<p>Advances in sensor technologies have transformed land cover mapping, significantly improving mangrove monitoring (<xref ref-type="bibr" rid="ref28">Giri et al., 2011</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). Medium-resolution multispectral data (10&#x2013;30&#x202F;m) provide reliable regional-scale information (<xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>). Researchers have used diverse methods, including visual interpretation, semi-automatic pixel- and object-based classification, and machine learning algorithms using vegetation indices (<xref ref-type="bibr" rid="ref45">Liu et al., 2008</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). However, conventional indices like NDVI often misclassify mangroves due to spectral similarities with other vegetation types (<xref ref-type="bibr" rid="ref45">Liu et al., 2008</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>).</p>
<p>To address this, <xref ref-type="bibr" rid="ref5">Baloloy et al. (2020)</xref> developed the Mangrove Vegetation Index (MVI), which enhances mangrove detection and minimizes post-classification corrections. The MVI, calculated as |NIR&#x2013;Green|/|SWIR&#x2013;Green| using Sentinel-2 and Landsat-8 bands, leverages the distinctive greenness and moisture properties of mangroves to differentiate them from terrestrial vegetation and non-vegetated surfaces (<xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>; <xref ref-type="bibr" rid="ref41">Kumar et al., 2019</xref>). Specifically, the |NIR-Green| component of the index captures the differences in greenness between mangrove forests and terrestrial vegetation, while the |SWIR-Green| component reflects the distinct humidity of mangroves due to their environment&#x2014;without requiring additional intertidal data and water indices.</p>
<p>Higher MVI values indicate a greater likelihood of mangrove presence (<xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). However, tidal fluctuations can affect spectral reflectance and reduce classification accuracy; in such cases, multi-temporal imagery has proven more effective than single-date acquisitions (<xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>).</p>
<p>We mapped mangrove extent in Mozambique for 2023 (Sentinel-2) and 2013 (Landsat-8) to evaluate decadal changes. Cloud-free images were selected, and Sentinel-2 data were resampled from 10&#x202F;m to 30&#x202F;m to match Landsat-8 resolution. To account for latitudinal bioclimatic variations across the country, we adjusted MVI thresholds and image acquisition dates. The MVI was calculated using green, NIR, and SWIR1 bands: B3 (green), B8 (NIR), and B11 (SWIR1) for Sentinel-2; and B3 (green), B5 (NIR), and B6 (SWIR1) for Landsat-8 (<xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). The formulas for the generic MVI, applied to Sentinel-2 and Landsat-8 OLI sensors are shown in <xref ref-type="table" rid="tab1">Table 1</xref>.</p>
<p><xref ref-type="bibr" rid="ref5">Baloloy et al. (2020)</xref> reported that higher MVI values correspond to an increased probability of a pixel representing mangrove cover. They identified an optimal MVI threshold range between 4.5 and 20 to distinguish mangroves but noted that threshold values may require adjustment depending on canopy density and local coastal conditions. In our case study, we set the lower threshold at 3.5 to better capture mangrove pixels. Additionally, while in some areas the maximum MVI values remained within the expected range (&#x003C;20) reported by <xref ref-type="bibr" rid="ref5">Baloloy et al. (2020)</xref>, other regions exhibited considerably higher maximum values (&#x003E;200), likely reflecting site-specific biophysical variations.</p>
<p>To map mangroves in Mozambique, we developed a workflow (<xref ref-type="fig" rid="fig2">Figure 2</xref>) based on a standardized set of rules for MVI calculation and post-processing. The use of rules and steps set in the workflow made it possible to replicate the calculation many times to cover the entire coastal area of Mozambique, avoiding classification errors between one area and another. This workflow therefore allows temporal data to be comparable (as in this case, 2013 and 2023). We applied this workflow to both 2013 and 2023 datasets to assess decadal changes in mangrove cover. The workflow was supported by two platforms: (i) Google Earth Engine (see <xref rid="app1" ref-type="app">Appendix</xref>) for automated retrieval, atmospheric correction, and processing of Sentinel-2 and Landsat-8 imagery; and (ii) QGIS (version 3.28.11) for post-processing, noise removal, mapping, and area calculation. The workflow comprised the following steps:</p>
<p>Step 1&#x2014;Selection of Areas of Interest. Mozambique&#x2019;s coastal provinces (Cabo Delgado, Nampula, Zambezia, Sofala, Inhambane, Gaza, and Maputo) have been selected, allowing for flexible adaptation of acquisition dates and MVI thresholds to local conditions.</p>
<p>Step 2&#x2014;Image Acquisition. For each province, atmospherically corrected Sentinel-2 (2023) and Landsat-8 (2013) images have been acquired. To minimize cloud disturbances and classification errors, images from the dry season (March&#x2013;September) and carefully tested acquisition dates have been prioritized, also applying a filter to discard images with a higher percentage of cloud cover. For each province, the acquisition dates were tested to capture the fewest number of noise pixels. In many cases, the time range was extended to calculate the MVI average over a longer period (March&#x2013;December). For more details on the dates of acquisition of the satellite images, see <xref ref-type="supplementary-material" rid="SM1">Supplementary Table 5</xref>.</p>
<p>Step 3&#x2014;MVI Calculation. The MVI formula was applied in Google Earth Engine, extracting mangrove pixels within a range of 3.5&#x202F;&#x003C;&#x202F;MVI&#x202F;&#x003C;&#x202F;700. In some provinces (e.g., Gaza), maximum MVI values aligned with literature thresholds (&#x003C;20; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>), whereas in others (e.g., Cabo Delgado), dense mangroves produced much higher values (&#x003E;200), consistent with independent mangrove distribution maps (<xref ref-type="bibr" rid="ref65">Spalding and Leal, 2024</xref>).</p>
<p>Step 4&#x2014;Resampling The 2023 outputs have been resampled from 10&#x202F;m to 30&#x202F;m resolution to match the 2013 data for comparison.</p>
<p>Step 5&#x2014;Cyclone Idai Impact Analysis. In Sofala province, it was been conducted a focused analysis of mangrove degradation along the Buzi River. Sentinel-2 images were used before (acquisition dates: April 2018 to February 2019) and after the passage of the cyclone (April 2019 to December 2019). For more details on the dates of acquisition of the satellite images, see <xref ref-type="supplementary-material" rid="SM1">Supplementary Table 6</xref>.</p>
<p>Step 6&#x2014;Export to GIS. The processed rasters have been exported to QGIS for further refinement, mapping, and mangrove area calculations.</p>
<p>Step 7&#x2014;Post-processing and Noise Removal. To improve classification accuracy, elevation and distance-based rules have been adapted from <xref ref-type="bibr" rid="ref45">Liu et al. (2008)</xref>. Using a DEM, pixels above 10&#x202F;m elevation have been excluded. To remove pixels unlikely to represent mangroves, a national coastline shapefile has been refined and after that, it was been applied a 1,200&#x202F;m inland and 200&#x202F;m ocean-side buffer. In river delta regions, the buffer based on historical mangrove presence (mangrove distribution map developed by Professor Hugo Mabilana from Eduardo Mondlane University) has been modified and adapteddata to account for coastline discrepancies.</p>
<p>Step 8&#x2014;Mangrove Area Estimation. Mangrove areas for 2013 and 2023 at 30&#x202F;m resolution have been calculated to assess trends in spatial extent.</p>
<p>Step 9&#x2014;Mapping Outputs. Finally, mangrove maps have been produced for 2013 and 2023 at provincial, regional, and national scales. In addition, loss and gain maps have been created (see <xref ref-type="supplementary-material" rid="SM1">Supplementary materials</xref>) to better visualize the differences between mangrove coverage extent in 2013 and 2023.</p>
</sec>
<sec id="sec9">
<label>2.3</label>
<title>Coastal vulnerability model</title>
<p>Coastal areas are exposed to increasing risks due to climate change (such as sea level rise and increased frequency of cyclones causing flooding) and increased anthropogenic pressures along these areas (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). In this context, exposure is defined as the presence of people, assets, or systems in hazard-prone areas subject to potential losses, while vulnerability reflects their susceptibility to harm from hazardous events (<xref ref-type="bibr" rid="ref69">United Nations International Strategy for Disaster Reduction (UNISDR), 2009</xref>; <xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>). Vulnerability encompasses social factors and the built environment, while exposure includes biophysical site conditions (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>).</p>
<p>We applied the InVEST Coastal Vulnerability Model, a free, open-source tool from the Natural Capital Project (2025), to assess coastal exposure to erosion and flooding in Mozambique at a 100-m resolution&#x2014;an improvement over previous studies using 1&#x2013;2&#x202F;km resolution (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). Designed for data-scarce regions, the model provides a qualitative exposure estimate, identifying high-risk coastal areas and evaluating the protective role of natural habitats (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). Its accessibility, low data requirements, and spatially explicit outputs make it well-suited for coastal management (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). The model supports adaptive coastal management by highlighting vulnerable areas, informing policy decisions, and promoting habitat conservation to reduce climate risks (<xref ref-type="bibr" rid="ref66">Tallis et al., 2015</xref>).</p>
<p>The InVEST Coastal Vulnerability Model generates an EI at 100&#x202F;m intervals along the coastline, assessing relative exposure to erosion and flooding. By integrating population data, it identifies high-risk human settlements. Outputs include geospatial points and EI maps, providing interpretable results for stakeholders prioritize intervention areas (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). The model uses the following bio-geo-physical variables:</p>
<list list-type="bullet">
<list-item><p>Landmass: Coastal boundaries of Mozambique&#x2019;s provinces (Cabo Delgado, Nampula, Zambezia, Sofala, Inhambane, Gaza, Maputo) were manually redrawn for accuracy.</p></list-item>
<list-item><p>Area of Interest (AOI): Encompasses the shoreline, enabling EI calculations at 100-m intervals.</p></list-item>
<list-item><p>Habitats: Mangroves (10-m resolution), coral reefs, seagrass beds, and coastal forests (extracted from DynamicWorld, &#x003C;100&#x202F;m altitude, within 500&#x202F;m of the coast) were included, with assigned protection distances and grades (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>; <xref ref-type="bibr" rid="ref18">Das and Cr&#x00E9;pin, 2013</xref>).</p></list-item>
<list-item><p>WAWEWATCHIII: Global dataset for wind and wave exposure during storms.</p></list-item>
<list-item><p>Continental Shelf Polyline: Estimates storm surge exposure based on shelf distance.</p></list-item>
<list-item><p>Population: Density near each coastal point.</p></list-item>
<list-item><p>DEM: Altitude above sea level.</p></list-item>
<list-item><p>Bathymetry: Depth data.</p></list-item>
</list>
<p>Further information on the datasets used are available in <xref ref-type="table" rid="tab2">Table 2</xref>.</p>
<p>We excluded sea level rise and geomorphology due to data unavailability. We calculated the EI as the geometric mean of bio-geo-physical variable rankings (1&#x202F;=&#x202F;very low, 5&#x202F;=&#x202F;very high), following <xref ref-type="bibr" rid="ref32">Gornitz (1990)</xref> and <xref ref-type="bibr" rid="ref37">Hammar-Klose and Thieler (2001)</xref>:</p>
<disp-formula id="E1">
<mml:math id="M4"><mml:mi mathvariant="italic">EI</mml:mi><mml:mo>=</mml:mo>
<mml:msup>
<mml:mrow>
<mml:mo stretchy="true">(</mml:mo>
<mml:msubsup>
<mml:mo>&#x220F;</mml:mo>
<mml:mrow>
<mml:mi>i</mml:mi>
<mml:mo>=</mml:mo>
<mml:mn>1</mml:mn>
</mml:mrow>
<mml:mi>n</mml:mi>
</mml:msubsup>
<mml:msub>
<mml:mi>R</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo stretchy="true">)</mml:mo>
</mml:mrow>
<mml:mfrac>
<mml:mn>1</mml:mn>
<mml:mi>n</mml:mi>
</mml:mfrac>
</mml:msup>
</mml:math>
</disp-formula>
<p>Where <italic>R<sub>i</sub></italic> represents the ranking of the <italic>i<sup>th</sup></italic> biogeophysical variable (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). For this study, we used an equal interval with an increment of 0.8 (<xref ref-type="table" rid="tab3">Table 3</xref>). For a complete list of the data source and software used in this study, see <xref rid="app1" ref-type="app">Appendix</xref>.</p>
</sec>
</sec>
<sec sec-type="results" id="sec10">
<label>3</label>
<title>Results</title>
<p>The MVI analysis revealed that Mozambique&#x2019;s mangrove cover decreased from 2,114&#x202F;km<sup>2</sup> in 2013 to 1,739 km<sup>2</sup> in 2023 (<xref ref-type="fig" rid="fig3">Figure 3</xref>; <xref ref-type="table" rid="tab4">Table 4</xref>), reflecting a net loss of 376 km<sup>2</sup> (&#x2212;18%) over the decade. The InVEST Coastal Vulnerability model classified the entire Mozambican coastline using the EI (<xref ref-type="fig" rid="fig4">Figure 4</xref>), ranging from 1 (low vulnerability) to 5 (high vulnerability; <xref ref-type="table" rid="tab3">Table 3</xref>). Quantile-based grouping (0.8 increments) indicated that 42% of the coastline (1,150&#x202F;km out of 11,768 km) exhibits intermediate to high vulnerability to flooding and erosion (<xref ref-type="fig" rid="fig5">Figure 5</xref>). This underscores the need for disaster prevention measures, particularly in areas affected by cyclone landfall. All coastal provinces are impacted, with Maputo (including Maputo City), Sofala, and Zambezia identified as the most vulnerable. Detailed results for the seven coastal provinces, ordered by mangrove loss (from highest to lowest), are presented below. For clarity, Maputo Province and Maputo City are combined. Province-specific maps are provided in the <xref ref-type="supplementary-material" rid="SM1">Supplementary materials</xref>.</p>
<p>The analyses showed that the most vulnerable provinces are also those that have experienced the greatest mangrove loss&#x2014;namely, Zambezia, Sofala, Maputo.</p>
<p>MVI analysis indicated that Zambezia suffered the larger mangrove area decrease in Mozambique, from 813&#x202F;km<sup>2</sup> in 2013 to 554 km<sup>2</sup> in 2023&#x2014;a loss of 258 km<sup>2</sup> (&#x2212;32%). The Coastal Vulnerability Model showed that 46% of Zambezia&#x2019;s coastline (classified from &#x201C;Intermediate&#x201D; to &#x201C;Very High&#x201D;) is highly exposed to flooding events and would therefore need intervention. Namacurra District exhibited the highest vulnerability, with coastal segments classified as EI &#x201C;Very High&#x201D; (see <xref ref-type="supplementary-material" rid="SM1">Supplementary Figure 15</xref>).</p>
<p>The province with the next highest mangrove surface loss is Sofala, where mangrove area shrank from 451&#x202F;km<sup>2</sup> in 2013 to 366 km<sup>2</sup> in 2023&#x2014;a loss of 84 km<sup>2</sup> (&#x2212;19%). EI values range from 1.1 to 5, with a mean value of 2.5. The Coastal Vulnerability Model showed that 40% of Sofala&#x2019;s coastline (classified from &#x201C;Intermediate&#x201D; to &#x201C;Very High&#x201D;) is highly exposed to flooding event. Cidade da Beira District displayed the highest vulnerability, with coastal segments ranked as &#x201C;High&#x201D; and &#x201C;Very High&#x201D; EI. Notably, Cyclone Idai severely impacted Beira, and the MVI analysis of the Buzi River area revealed a mangrove cover reduction from 76 km<sup>2</sup> pre-cyclone (2018) to 23 km<sup>2</sup> post-cyclone (2019)&#x2014;a loss of 53&#x202F;km<sup>2</sup> (&#x2212;69%; <xref ref-type="fig" rid="fig6">Figure 6</xref>). This underscores the cyclone&#x2019;s significant impact on mangrove ecosystems, as well as on human life and infrastructe.</p>
<p>In Nampula Province, MVI analysis indicated a mangrove area decrease from 370&#x202F;km<sup>2</sup> in 2013 to 338 km<sup>2</sup> in 2023&#x2014;a loss of 31 km<sup>2</sup> (&#x2212;8%). EI values range from 1.1 to 4.8, with a mean value of 2.4. The Coastal Vulnerability Model showed that 39% of Napula&#x2019;s coastline (classified from &#x201C;Intermediate&#x201D; to &#x201C;Very High&#x201D;) is highly exposed to flooding. Moma and Angoche Districts showed the highest vulnerability, with coastal segments classified as EI &#x201C;Very High&#x201D; (see <xref ref-type="supplementary-material" rid="SM1">Supplementary Figure 18</xref>).</p>
<p>In Maputo Province, MVI analysis revealed that mangrove area decreased from 41 km<sup>2</sup> in 2013 to 36 km<sup>2</sup> in 2023&#x2014;a loss of 5 km<sup>2</sup> (&#x2212;12%), equating to approximately 0.5 km<sup>2</sup> per year. EI values range from 1 to 4.5 (mean: 2.6). The Coastal Vulnerability Model showed that 46% of Maputo&#x2019;s coastline (classified from &#x201C;Intermediate&#x201D; to &#x201C;Very High&#x201D;) is highly exposed to flooding events. Marracuene and Manhi&#x00E7;a Districts exhibited the most &#x201C;Intermediate-High&#x201D; EI values, while Cidade de Maputo had &#x201C;Very High&#x201D; EI segments.</p>
<p>In Inhambane Province, the MVI analysis showed a slight decrease in mangrove area&#x2014;from 156 km<sup>2</sup> in 2013 to 153&#x202F;km<sup>2</sup> in 2023&#x2014;a loss of 3 km<sup>2</sup> (&#x2212;2%). EI values range from 1 to 4.2 (mean: 2.4). The Coastal Vulnerability Model showed that 38% of the coastline of Inhambane Province (values ranging from &#x201C;Intermediate&#x201D; to &#x201C;High&#x201D; - no &#x201C;Very High&#x201D; values were recorded) is found to be highly exposed to flooding. Zavala District exhibited the most &#x201C;Intermediate-High&#x201D; EI values.</p>
<p>Conversely, Cabo Delgado Province experienced a mangrove area increase, from 281&#x202F;km<sup>2</sup> in 2013 to 287 km<sup>2</sup> in 2023&#x2014;a gain of 6 km<sup>2</sup> (+2%). EI values range from 1 to 4.6 (mean: 2.4). The Coastal Vulnerability Model showed that 39% of the coastline of Cabo Delgado Province (values ranging from &#x201C;Intermediate&#x201D; to &#x201C;Very High&#x201D;) is highly exposed to flooding. Palma District exhibited the highest vulnerability, with &#x201C;Very High&#x201D; EI coastal segments, followed by Moc&#x00ED;mboa da Praia.</p>
<p>Similarly, MVI analysis revealed a mangrove area increase in Gaza Province from 2.8&#x202F;km<sup>2</sup> in 2013 to 3.2 km<sup>2</sup> in 2023&#x2014;a gain of 0.5&#x202F;km<sup>2</sup> (+15%). These mangroves, located primarily in the protected Limpopo River delta, showed no significant disturbance. EI values range from 1.4 to 4 (mean: 2.6). The Coastal Vulnerability Model showed that 50.7% of the coastline of Gaza Province (values ranging from &#x201C;Intermediate&#x201D; to &#x201C;High&#x201D;; no &#x201C;Very High&#x201D; values recorded) is highly exposed to flooding. Mandlakaze District exhibited the most &#x201C;Intermediate-High&#x201D; EI values, indicating higher vulnerability.</p>
<p>For more details on the results for each coastal province, see <xref ref-type="supplementary-material" rid="SM1">Supplementary materials section B</xref>. In addition, maps showing mangrove loss and gain for certain areas of Mozambique are available in <xref ref-type="supplementary-material" rid="SM1">Supplementary materials section C</xref>.</p>
</sec>
<sec sec-type="discussion" id="sec11">
<label>4</label>
<title>Discussion</title>
<p>This study presents a robust framework for evaluating the dynamics of mangrove ecosystems and the vulnerability of the coastline in Mozambique, an area that is particularly vulnerable to the effects of climate change, such as intensifying cyclones and rising sea levels (<xref ref-type="bibr" rid="ref16">Chichava et al., 2024</xref>). Our approach enhances the precision of mangrove monitoring and coastal exposure analysis by integrating the MVI with the InVEST Coastal Vulnerability Model at a 100&#x202F;m resolution. The standardized, cloud-based workflow utilizing Google Earth Engine and QGIS offers a scalable alternative to traditional field surveys, enabling the efficient identification of priority areas for conservation and restoration. This methodology strengthens Mozambique&#x2019;s disaster risk management framework and makes a significant contribution to global research on coastal resilience in regions vulnerable to climate change.</p>
<p>This study rigorously quantifies mangrove loss in Mozambique from 2013 to 2023, documenting a 18% reduction (377 km<sup>2</sup>), which aligns with global mangrove decline rates of 1&#x2013;2% annually (<xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>). By applying the MVI within Google Earth Engine, we effectively mapped mangroves at 10&#x202F;m and 30&#x202F;m resolutions, leveraging its ability to distinguish mangroves from other vegetation types (<xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). The MVI&#x2019;s simplicity and automation potential position it as a scalable tool for rapid, cloud-based monitoring, surpassing labor-intensive field surveys (<xref ref-type="bibr" rid="ref45">Liu et al., 2008</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). However, the MVI&#x2019;s upper limit in Mozambique exceeds reported thresholds, suggesting denser mangrove stands and highlighting the need for region-specific calibration to optimize classification accuracy (<xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>).</p>
<p>The provinces of Zambezia and Sofala, in addition to being the provinces with the highest mangrove coverage in the country, are also those that have suffered the greatest losses. In the case of Zambezia province, we are talking about a 32% (&#x2212;259&#x202F;km<sup>2</sup>) reduction in 10&#x202F;years, concentrated mainly in the districts of Maquival and Namacurra. It is believed that among the main causes of this loss are the construction of the Kariba Dam in 1960 and the Cahora Bassa Dam in 1975 on the Zambezi River, which over the years have altered both the total flow of fresh water into the delta and the cyclical flooding of the floodplain (<xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>). Those districts also result in high coastal vulnerability to flooding and erosion, as assessed by the InVEST Coastal Vulnerability Model (<xref ref-type="bibr" rid="ref66">Tallis et al., 2015</xref>). About 14% of Zambezia&#x2019;s coastline is classified as highly or very highly vulnerable, due to its geomorphology like low-lying land and large estuaries (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>; <xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>).</p>
<p>As for the province of Sofala, there has been an 18% (&#x2212;85&#x202F;km<sup>2</sup>) loss in 10&#x202F;years, with the greatest losses concentrated along the Buzi and P&#x00FA;ngu&#x00E8; rivers (hit in 2019 by Cyclone Idai). The cyclone reduced Buzi and P&#x00FA;ngu&#x00E8; River mangrove cover by 69.33% (54&#x202F;km<sup>2</sup>), highlighting the destructive impact of extreme weather events (<xref ref-type="bibr" rid="ref15">Charrua et al., 2021</xref>; <xref ref-type="bibr" rid="ref55">Phiri et al., 2021</xref>). This is an area highly prone to cyclones, which cause severe flooding (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). While mangroves have the ability to protect coastlines from storm surges&#x2014;reducing wave speed thanks to their dense system of aerial roots (<xref ref-type="bibr" rid="ref57">Quartel et al., 2007</xref>; <xref ref-type="bibr" rid="ref74">Zhang et al., 2012</xref>; <xref ref-type="bibr" rid="ref56">Pinsky et al., 2013</xref>; <xref ref-type="bibr" rid="ref65">Spalding and Leal, 2024</xref>)&#x2014;these events can also pose a serious threat, leading to extensive destruction of trunks and roots (<xref ref-type="bibr" rid="ref15">Charrua et al., 2021</xref>; <xref ref-type="bibr" rid="ref55">Phiri et al., 2021</xref>). This study quantitatively assessed the degradation of mangroves after Cyclone Idai struck the Beira area (in Sofala province), but further research on estimating the recovery time of these plants is needed. It should be noted that the greater the frequency of these extreme weather events, the less time these plants have to grow and recolonize areas, and the less ecosystem services they can provide to coastal populations. Timely intervention to promote restoration in degraded areas that are highly susceptible to cyclones could be an effective strategy for maintaining active coastal protection ecosystem services to limit damage to people and infrastructure in preparation for the next flood. In addition to being an area highly prone to this type of event, mangroves are also threatened by deforestation (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>).</p>
<p>In contrast, Gaza and Cabo Delgado provinces showed modest mangrove gains (14 and 2%, respectively), possibly due to favorable riverine conditions and lower anthropogenic pressures (<xref ref-type="bibr" rid="ref25">Fatoyinbo et al., 2008</xref>). In particular, with regard to the province of Cabo Delgado, this area is known to be sparsely populated and to have security problems. We believe that this may have contributed to both a better EI (despite being an area highly prone to cyclones) and less mangrove loss (due to less human influence).</p>
<p>Maputo Province, despite pollution from oil spills and urban waste (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>; <xref ref-type="bibr" rid="ref63">Simbine, 2023</xref>), experienced a moderate loss of 18%, which may suggest localized resilience or restoration efforts. Notably, initiatives such as the Italian Agency for Development Cooperation&#x2019;s project in the Maputo Baia (<xref ref-type="bibr" rid="ref1">AICS, 2022</xref>) and recent ecological assessments on the mangroves of Matola District (<xref ref-type="bibr" rid="ref63">Simbine, 2023</xref>; <xref ref-type="bibr" rid="ref44">Litulo et al., 2023</xref>) reflect a growing institutional focus on conservation and rehabilitation. These provincial variations underscore the interplay of local ecological conditions and human activities in shaping mangrove dynamics. The main threats to mangroves reported in the literature for Maputo Bay are firstly that Maputo City hosts one of the major ports in Southeast Africa, increasing the risk of oil spills (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). A total of 14 minor and two major crude oil spills involving mangroves have occurred in Maputo Harbor, including one in 1992 involving the tanker Katina P (<xref ref-type="bibr" rid="ref9">Barbosa et al., 2001</xref>). In addition, five rivers, some of which are international, flow into the bay and are used for agricultural purposes in the upper part of the riviera, and thus there is an influx of pollutants and reduced river flow in the lower part of the riviera (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). Another problem is that the existence of mangroves and the high level of nutrients from the rivers encourages the development of commercially valuable fisheries, such as shallow-water shrimp and small pelagic species (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). Moreover, Maputo City, which is connected to the bay, is overpopulated, with about 2 million people, without adequate treatment of domestic waste. The country&#x2019;s major industries are located in Maputo and Matola and dump their waste into the bay (<xref ref-type="bibr" rid="ref62">Sete et al., 2002</xref>). All these factors contribute to the possible pollution of the bay through domestic, industrial, and agricultural wastes, which, in turn, can affect water quality and thus ecosystem productivity. Finally, regarding the main causes of mangrove destruction in Maputo Bay, <xref ref-type="bibr" rid="ref14">Charrua et al. (2020)</xref> include deforestation and urban expansion.</p>
<p>Mangroves play a critical role in mitigating coastal hazards by reducing wave energy and storm surge impacts, as evidenced by modeling studies (<xref ref-type="bibr" rid="ref49">Massel et al., 1999</xref>; <xref ref-type="bibr" rid="ref50">Mazda et al., 2006</xref>; <xref ref-type="bibr" rid="ref7">Barbier, 2008</xref>; <xref ref-type="bibr" rid="ref10">Blankespoor et al., 2017</xref>). Their protective capacity depends on forest width, density, and coastal topography (<xref ref-type="bibr" rid="ref65">Spalding and Leal, 2024</xref>). In Mozambique, 9.5% of the 11,768.11&#x202F;km coastline is highly or very highly vulnerable, with Zambezia, Sofala, and Maputo facing elevated risks (<xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>). The severe mangrove loss in these provinces likely amplifies coastal exposure, as mangroves provide critical stabilization and flood protection (<xref ref-type="bibr" rid="ref3">Alongi, 2008</xref>; <xref ref-type="bibr" rid="ref68">UNEP-WCMC, 2006</xref>).</p>
<p>The combined use of the MVI and InVEST models offers a robust framework for identifying priority areas for mangrove management. High-vulnerability districts, such as Buzi and Cidade da Beira (Sofala) and Maquival and Namacurra (Zambezia), which also experience significant mangrove loss and population pressures, warrant urgent intervention (<xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>). Restoration projects, prioritizing flood-tolerant species like <italic>Avicennia marina</italic> (<xref ref-type="bibr" rid="ref3">Alongi, 2008</xref>), could enhance coastal resilience in these areas. Moreover, stakeholder engagement and enforced regulations are essential to ensure community development, biodiversity conservation, and social equity in mangrove management (<xref ref-type="bibr" rid="ref14">Charrua et al., 2020</xref>).</p>
<p>The mangrove loss rate observed in Mozambique from 2013 to 2023 (&#x2212;18%) is consistent with values found in other tropical and subtropical regions but slightly exceeds the global annual average of 0.16&#x2013;2% (<xref ref-type="bibr" rid="ref36">Hamilton and Casey, 2016</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>). The <xref ref-type="bibr" rid="ref30">Global Mangrove Watch (2024)</xref> reports that, among the countries with the highest mangrove coverage, Mozambique ranks eighth among the top 10 mangrove-holding countries in terms of loss between 1996 and 2020. Globally, the most severe recent declines have occurred in Indonesia, Australia, Mexico, Myanmar, and Cuba (<xref ref-type="bibr" rid="ref36">Hamilton and Casey, 2016</xref>; <xref ref-type="bibr" rid="ref30">Global Mangrove Watch, 2024</xref>). Despite these trends, our findings suggest that the rate of mangrove loss in Mozambique is higher than the global average, indicating a particularly critical situation.</p>
<p>Despite its strengths, this study does not include accuracy estimates for the MVI, limiting confidence in its precision. The discrepancy between our 2023 mangrove estimate (1,739.44&#x202F;km<sup>2</sup>) and GMW&#x2019;s 2020 estimate (3,380.27&#x202F;km<sup>2</sup>) likely reflects methodological or resolution differences, which should be further investigated (<xref ref-type="bibr" rid="ref30">Global Mangrove Watch, 2024</xref>). Future research should focus on validating MVI performance across ecosystems, incorporating time-series analyses (e.g., NDVI) to detect flooding events, and assess restoration outcomes. Additionally, investigating cyclone impacts under climate change scenarios is critical for designing Nature-based Solutions, particularly in under-studied regions such as Sofala (<xref ref-type="bibr" rid="ref15">Charrua et al., 2021</xref>).</p>
<p>The choice to resample Sentinel-2 imagery from 10&#x202F;m to 30&#x202F;m resolution was made to ensure direct comparability with Landsat-8 data, allowing consistent application of the MVI across both time periods. Although alternative approaches such as pan-sharpening Landsat imagery to 15&#x202F;m using the panchromatic band have been applied in other land cover studies, this option was not suitable for our analysis. The Landsat panchromatic band does not include the shortwave infrared (SWIR) wavelengths that are essential for MVI calculation, and pan-sharpening can introduce spectral distortions that may reduce the reliability of vegetation indices in complex coastal environments. For these reasons, we prioritized spectral integrity and methodological consistency. Nevertheless, future studies could explore pan-sharpened datasets as complementary inputs, particularly for object-based classifications or fine-scale land cover mapping.</p>
<p>The InVEST Coastal Vulnerability Model simplifies the EI calculation by using a geometric mean and does not incorporate habitat quality and conservation status (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>). Data unavailability for sea level rise and geomorphology limited the analysis. Furthermore, the model does not account for cyclone damage occurring inland&#x2014;a significant omission in Mozambique, where lightweight housing often results in severe impacts hundreds of kilometers from the coast (<xref ref-type="bibr" rid="ref13">Cabral et al., 2017</xref>).</p>
<p>Mozambique&#x2019;s multi-tiered disaster management system&#x2014;led by the National Institute for Disaster Management (INGC) and supported by regional centers and community committees&#x2014;is reinforced by anticipatory action protocols and early warning systems (<xref ref-type="bibr" rid="ref40">IFRC, 2013</xref>). This article strengthens that framework by providing a spatially explicit assessment of mangrove loss and cyclone vulnerability using MVI and the InVEST model. The findings support targeted intervention, mangrove restoration, and integration of Nature-based Solutions into national disaster preparedness and coastal adaptation strategies.</p>
<p>Mozambique has developed a comprehensive, multi-level approach to cyclone preparedness and response, combining strong national coordination through the National Institute for Disaster Management (INGC), regional specialization via emergency operation centers (CENOE) in Vilankulos, Caia, and Nacala, and grassroots engagement through local Disaster Risk Management Committees. This system is complemented by community-based early warning mechanisms and anticipatory action frameworks, including the Early Action Protocol (EAP) for cyclones and forecast-based financing supported by the Mozambique Red Cross Society and the World Food Program (<xref ref-type="bibr" rid="ref40">IFRC, 2013</xref>). Within this framework, the present article provides a timely and valuable contribution by delivering a spatially explicit assessment of mangrove loss and cyclone vulnerability. It strengthens Mozambique&#x2019;s national DRR planning, aligning closely with the objectives of the Plano Director para a Redu&#x00E7;&#x00E3;o do Risco de Desastres 2017&#x2013;2030 (PDRRD), which emphasizes integrated risk management, territorial planning, and ecosystem-based adaptation (<xref ref-type="bibr" rid="ref54">PDRRD, 2017</xref>).</p>
<p>The combined use of the MVI and the InVEST Coastal Vulnerability Model offers operational decision support for implementing Nature-based Solutions (NbS), identifying restoration priorities, and mainstreaming resilience into development strategies. By identifying priority zones for mangrove restoration and highlighting high-risk coastal segments, this study supports both defense and environmental institutions in proactively reducing cyclone-related impacts. It also serves broader cross-sectoral goals&#x2014;from blue economy development to land-use planning&#x2014;ultimately strengthening Mozambique&#x2019;s resilience in the face of escalating climate risks.</p>
<p>Despite its strengths, this study does not include accuracy estimates for the MVI, limiting confidence in its precision, a common limitation in large-scale mangrove remote sensing studies, where logistical and financial constraints often hinder systematic ground data collection (<xref ref-type="bibr" rid="ref28">Giri et al., 2011</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>). Future research should focus on validating MVI performance across ecosystems, incorporating time-series analyses, and targeted field validation.</p>
<p>In conclusion, this study advances mangrove monitoring by combining MVI mapping with coastal vulnerability modeling, emphasizing the urgent need for conservation in Mozambique&#x2019;s most at-risk provinces. By providing a scalable, data-driven approach, our workflow supports global mangrove management efforts and contributes to safeguarding ecosystem services that are vital to coastal communities (<xref ref-type="bibr" rid="ref45">Liu et al., 2008</xref>; <xref ref-type="bibr" rid="ref75">Zhang et al., 2017</xref>; <xref ref-type="bibr" rid="ref5">Baloloy et al., 2020</xref>).</p>
</sec>
<sec sec-type="conclusions" id="sec12">
<label>5</label>
<title>Conclusion</title>
<p>This study provides the first national-scale analysis combining mangrove cover change and coastal vulnerability in Mozambique using the MVI and the InVEST Coastal Vulnerability Model. Results reveal a significant decline in mangrove extent between 2013 and 2023, with a 18% national loss and more severe reductions in provinces facing the highest exposure to coastal hazards. This spatial correlation underscores the urgent need to integrate mangrove conservation into coastal risk management strategies.</p>
<p>The MVI proved effective for rapid, large-scale mangrove monitoring, while the InVEST model highlighted areas where natural habitats play a critical role in mitigating erosion and flooding. However, both tools have limitations. The MVI requires further validation, and the InVEST model excludes important variables such as inland cyclone impacts and habitat condition. These gaps call for targeted field validation and the integration of additional data layers, including sea-level rise and geomorphology, to enhance future assessments.</p>
<p>Given Mozambique&#x2019;s high vulnerability to climate extremes and rapid coastal development, the findings support the prioritization of Nature-based Solutions, particularly mangrove restoration, in spatial planning. Protecting and rehabilitating mangroves in high-risk areas such as Zambezia, Sofala, and Maputo provinces will be essential to safeguard ecosystems, livelihoods, and infrastructure in the face of escalating climate threats.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="sec13">
<title>Data availability statement</title>
<p>Data on mangrove cover at 30 m resolution (as of 2013 and 2023) are available at this link in GeoTIFF format: <ext-link xlink:href="https://doi.org/10.6084/m9.figshare.29249738.v2" ext-link-type="uri">https://doi.org/10.6084/m9.figshare.29249738.v2</ext-link>. For data at 10 m resolution, please contact the authors. Raster data on mangrove loss and gain between 2013 and 2023 are available in GeoTIFF format at the following link: <ext-link xlink:href="https://doi.org/10.6084/m9.figshare.30011083.v1" ext-link-type="uri">https://doi.org/10.6084/m9.figshare.30011083.v1</ext-link>.</p>
</sec>
<sec sec-type="author-contributions" id="sec14">
<title>Author contributions</title>
<p>CF: Data curation, Resources, Validation, Conceptualization, Visualization, Formal analysis, Supervision, Methodology, Writing &#x2013; review &#x0026; editing, Software, Writing &#x2013; original draft, Investigation. FA: Visualization, Methodology, Supervision, Funding acquisition, Software, Project administration, Resources, Writing &#x2013; review &#x0026; editing, Validation. CB: Supervision, Data curation, Conceptualization, Investigation, Validation, Resources, Writing &#x2013; review &#x0026; editing, Visualization. EC: Visualization, Supervision, Writing &#x2013; review &#x0026; editing. PR-P: Formal analysis, Resources, Visualization, Funding acquisition, Project administration, Supervision, Data curation, Writing &#x2013; review &#x0026; editing, Conceptualization, Validation. LM: Writing &#x2013; review &#x0026; editing, Software, Formal analysis, Visualization, Validation, Conceptualization, Supervision, Methodology, Data curation, Investigation.</p>
</sec>
<sec sec-type="funding-information" id="sec15">
<title>Funding</title>
<p>The author(s) declare that financial support was received for the research and/or publication of this article. This research was funded by the project &#x201C;ManGrowth &#x2013; Preservation of Ecosystems for Sustainable Development&#x201D; (AID 12432), an international cooperation project between Sapienza University of Rome and University Eduardo Mondlane of Maputo, funded by AICS (Italian Agency for Development Cooperation).</p>
</sec>
<ack>
<p>The authors would like to thank Pierluca Nazari for his technical support in GIS applications during the conduct of this study.</p>
</ack>
<sec sec-type="COI-statement" id="sec16">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="ai-statement" id="sec17">
<title>Generative AI statement</title>
<p>The author(s) declare that no Gen AI was used in the creation of this manuscript.</p>
<p>Any alternative text (alt text) provided alongside figures in this article has been generated by Frontiers with the support of artificial intelligence and reasonable efforts have been made to ensure accuracy, including review by the authors wherever possible. If you identify any issues, please contact us.</p>
</sec>
<sec sec-type="disclaimer" id="sec18">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<sec sec-type="supplementary-material" id="sec19">
<title>Supplementary material</title>
<p>The Supplementary material for this article can be found online at: <ext-link xlink:href="https://www.frontiersin.org/articles/10.3389/ffgc.2025.1648754/full#supplementary-material" ext-link-type="uri">https://www.frontiersin.org/articles/10.3389/ffgc.2025.1648754/full#supplementary-material</ext-link></p>
<supplementary-material xlink:href="Data_Sheet_1.docx" id="SM1" mimetype="application/vnd.openxmlformats-officedocument.wordprocessingml.document" xmlns:xlink="http://www.w3.org/1999/xlink"/>
<supplementary-material xlink:href="Table_1.DOCX" id="SM2" mimetype="application/vnd.openxmlformats-officedocument.wordprocessingml.document" xmlns:xlink="http://www.w3.org/1999/xlink"/>
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</ref-list>
<app-group>
<app id="app1">
<title>Appendix</title>
<p>Data and software</p>
<list list-type="bullet">
<list-item><p>Natural Capital Project. (2025). InVEST coastal vulnerability model [Computer software]. Stanford University. <ext-link xlink:href="https://naturalcapitalproject.stanford.edu/software/invest" ext-link-type="uri">https://naturalcapitalproject.stanford.edu/software/invest</ext-link></p></list-item>
<list-item><p><ext-link xlink:href="http://QGIS.org" ext-link-type="uri">QGIS.org</ext-link>. (2024). <italic>QGIS Geographic Information System</italic> (Version 3.28.11) [Software]. QGIS Association. <ext-link xlink:href="https://qgis.org/" ext-link-type="uri">https://qgis.org</ext-link>.</p></list-item>
<list-item><p>Gorelick et al. (2017). Google Earth Engine: Planetary-scale geospatial analysis for everyone. <italic>Remote Sensing of Environment, 202</italic>, 18&#x2013;27. <ext-link xlink:href="https://doi.org/10.1016/j.rse.2017.06.031" ext-link-type="uri">https://doi.org/10.1016/j.rse.2017.06.031</ext-link>. <ext-link xlink:href="https://earthengine.google.com/" ext-link-type="uri">https://earthengine.google.com</ext-link>.</p></list-item>
<list-item><p>R Core Team. (2024). <italic>R: A Language and Environment for Statistical Computing</italic> (Version 4.3.1) [Software]. R Foundation for Statistical Computing. <ext-link xlink:href="https://www.r-project.org/" ext-link-type="uri">https://www.R-project.org</ext-link>.</p></list-item>
<list-item><p>Coral reef and seagrass: <ext-link xlink:href="http://geoportal.rcmrd.org/layers/servir%3Amozambique_seagrass" ext-link-type="uri">http://geoportal.rcmrd.org/layers/servir%3Amozambique_seagrass</ext-link>.</p></list-item>
<list-item><p>Coastal Forests: <ext-link xlink:href="https://dynamicworld.app/" ext-link-type="uri">https://dynamicworld.app/</ext-link>.</p></list-item>
<list-item><p>Landmass and AOI: <ext-link xlink:href="https://data.humdata.org/dataset/cod-ab-moz?#" ext-link-type="uri">https://data.humdata.org/dataset/cod-ab-moz?#</ext-link>.</p></list-item>
<list-item><p>DEM: Copernicus DEM GLO-30: Global 30&#x202F;m Digital Elevation Model.</p></list-item>
<list-item><p>Bathymetry: <ext-link xlink:href="https://www.gebco.net/data_and_products/gridded_bathymetry_data/" ext-link-type="uri">https://www.gebco.net/data_and_products/gridded_bathymetry_data/</ext-link>.</p></list-item>
<list-item><p>Population: WorldPop Global Project Population Data: Estimated Residential Population per 100x100m Grid Square.</p></list-item>
<list-item><p>WAVEWATCH III<sup>&#x00AE;</sup>: <ext-link xlink:href="https://polar.ncep.noaa.gov/waves/wavewatch/" ext-link-type="uri">https://polar.ncep.noaa.gov/waves/wavewatch/</ext-link>.</p></list-item>
<list-item><p>Mozambique Administrative Boundaries: <ext-link xlink:href="https://data.humdata.org/dataset/cod-ab-moz?#" ext-link-type="uri">https://data.humdata.org/dataset/cod-ab-moz?#</ext-link></p></list-item>
<list-item><p>USGS Landsat 8 Level 2, Collection 2, Tier 1.</p></list-item>
<list-item><p>Harmonized Sentinel-2 MSI: MultiSpectral Instrument, Level 2A.</p></list-item>
<list-item><p>Mozambique waterways: <ext-link xlink:href="https://data.humdata.org/dataset/hotosm_moz_waterways" ext-link-type="uri">https://data.humdata.org/dataset/hotosm_moz_waterways</ext-link>.</p></list-item>
</list>
</app>
</app-group>
</back>
</article>