Climate change continues to disrupt ecosystem function and human communities globally, threatening biodiversity as well as food supply and economic security (IPCC, 2021). There is a clear need to quantify the current state of marine ecosystems, so as to define a present-day baseline and improve understanding of how ecosystems are responding to climate variability and climate change. This includes considering new forms of knowledge production and accounting for epistemologies when conducting integrative marine research (Moon et al.). The first theme to emerge from this Research Topic focused on understanding and quantifying the state and variability of marine ecosystems. Topics ranged across disciplines, from the need for improved marine biosphere observations, over the role of ecosystem services, to the vulnerability of ecosystems to climate extremes and variability.

The importance of improving modelling scenarios, predictions and projections at multiple scales was one of the themes that emerged from the articles in this Research Topic, and highlighted that the accuracy of these approaches is key to preparing and adapting to change. For instance, Franco et al. showed how deep warming hotspots of the southwest South Atlantic Ocean extend in the water column, particularly in the mid-water and bottom layers, where species of different ecological and economic importance inhabit. Their findings aimed to draw the attention of stakeholders and decision-makers to develop better management approaches for marine biota in the context of climate change. Tonelli et al. used a suite of Earth System Model projections to indicate a loss of bacterial and archaeal diversity in surface waters of the Southern Ocean, with potentially large negative implications for key biogeochemical processes, such as carbon, nitrogen, and sulphur cycling. Levine et al. studied the water-column response to major storms using a simplified data mining technique and concluded that establishing a community of practice for early career scientists in oceanography can enhance their skills, promote collaborations and potentially create meaningful scientific innovations.

Saldívar-Lucio et al. discussed the importance of identifying climate risks and responses at the local level and how psycho-social factors and local attributes might operate and enhance climate resilience. The importance of spatial scales was highlighted by Magel et al., who assessed risk as a combination of exposure, where Dungeness crab reliance and social vulnerability indices demonstrated that communities along the US west coast showed different degrees of susceptibility to a decline in catch. In a similar focus on spatiotemporal resolution, Lawson et al. demonstrated the sensitivity of bioenergetic models to spatial, temporal, and ontogenetic variability in predator diets. Other studies identified how interdisciplinary approaches can help improve adaptive capacity and strengthen management. For instance, Gammage and Jarre describe how using scenario-based approaches (i.e structured decision-making tools) in a research process with marginalised stakeholders can enhance adaptive capacity at the local level. Quintana et al. examined how a short-term, inclusive and adaptive area-based conservation model can help achieve both social and ecological objectives given that area design is ecologically sound and supported by integrated social-ecological theory.

Marine governance is critical to ensuring biodiversity conservation and the sustainable use of coastal and marine resources. In the context of fisheries, Mackay et al. examined evidence for the possible connection between illegal, unreported, and unregulated (IUU) fishing and organised crime, and the links among illegal fishing and other crimes with the aim to protect those working in the marine fisheries industry and to support the sustainability of global fisheries. Relatedly, Mackay et al. explored what psycho-social characteristics of individuals were associated with the responses to management incentives in recreational fisheries, and identified that ecological values and personality types were important factors for certain compliance groups. Understanding the behavioural characteristics of fisheries compliance will help to progress innovative fisheries management.

Ortega-Cisneros et al. urged the inclusion of climate change and adaptation approaches into relevant fisheries management documents in South Africa, since the inclusion of both approaches is limited for the marine aquaculture and fisheries sector. In the aquaculture sector, Selim at al. examined ways to ensure equitable development, so that the most marginalised coastal communities impacted by increasing salinity are able to benefit from new livelihoods that are adapted to climate change.

This topic also highlights the relevance of introducing significant changes in management tools to those which facilitate participatory modes of governance, which can also serve genuine knowledge co-production (Breckwoldt et al.), avoid exclusionary processes in underrepresented groups, and recognise the access, rights, and cultural values of marine social-ecological communities, with the aim to promote social equity and ecological conservation (Muhl et al.; Okafor-Yarwood et al.; Pennino et al.). Uffman-Kirsch et al. further argues that public participation in marine-based decision-making can offer legitimacy to governance decisions, whilst also bolstering marine actors to use and sustain their social licence. This is further evidenced by Cvitanovic et al. who found visitors to a marine World Heritage Area had a limited understanding of the rules and regulations in place to support its management. They highlight future considerations for managers when developing visitor-focused communication and engagement strategies.

The fourth theme to emerge from this special issue highlights perspectives on the role of ECRs in solving contemporary coastal and ocean challenges. Contributed papers highlight the unique challenges faced by marine ECRs, many of which have been exacerbated by the COVID-19 pandemic (Pardo et al.). These include the availability of paid work within the marine biology and conservation market (Osiecka et al.), and the need for ECRs to understand and employ interdisciplinary research approaches and develop a broader set of skills beyond those traditionally taught as part of ECR training. Cosentino and Souviron-Priego discuss the expectations placed on ECRs to have a wide range of skills beyond their focal research discipline, particularly in relation to communication and collaboration across disciplines. In addition to scientific endeavours, papers within this Research Topic highlight that ECRs are increasingly working to navigate the science-policy interface to ensure that the outcomes of their research have real world tangible impacts. For example, Ferrer et al. describe their view of participating in the UN climate negotiations as ECRs, summarising the key themes of the negotiations and encouraging other young scientists to familiarise themselves with the negotiation processes to facilitate ECR representation.

In highlighting the challenges faced by ECRs, contributed papers also identify opportunities, actions and solutions to overcome these barriers. Wilson et al. reflect on the experiences of graduate students who successfully completed the NSF-funded Research Traineeship Program in the USA and discuss the importance of developing relationships to overcome disciplinary differences. Building on this, Deininger et al. suggest that senior researchers are key enablers for the success of ECRs. For example, senior researchers can include ECRs in their long-term funding and project planning, expose them to their research networks, and implement steps to share experimental knowledge both within and amongst institutions.

The papers in this Research Topic highlight the wide-reaching and interdisciplinary nature of ECRs in identifying and developing innovative solutions to successfully navigate marine sustainability challenges. Supporting ECRs to undertake successful interdisciplinary research necessitates institutional reform and support (Kelly et al., 2019). Measures to achieve these goals include the development of impact-based performance metrics (i.e. those that go beyond traditional measures of academic performance to acknowledge the broader set of activities that comprise interdisciplinary research practice), building effective interdisciplinary institutional capacity including the support of female leadership (as identified and outlined in Blythe and Cvitanovic), and promoting inclusive metrics of success to dismantle a discriminatory reward system in science and improve diversity, equity and inclusion across all scientific spaces (Brodie et al., 2021; Davies et al., 2021). Similarly, global research networks such as the Integrated Marine Biosphere Research Project (IMBeR), and in particular its ECR network the Interdisciplinary Marine Early Career Network (IMECaN), of which all the authors are members of, can help to strengthen global research networks and provide important pathways to help ECRs to undertake collaborative interdisciplinary research (Hobday et al., 2020; van Putten et al., 2021) Through these, and other steps, we can unlock the full potential of ECRs to become the future ocean leaders that are needed both now as we enter the UN Ocean Decade, and into the future, to safeguard the future of global marine environments for all of society and nature.

SB, CC, AF, JL, SM, KO-C, MP, SS, and NV were topic editors for the Research Topic. All authors contributed to the review and synthesis of articles, as well as writing and editing of the manuscript. All authors contributed to the article and approved the submitted version.

This publication resulted in part from support from the US National Science Foundation (grant OCE-1840868) to the Scientific Committee on Oceanic Research (SCOR).

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.

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