Research priorities for the sustainability of coral-rich western Pacific seascapes

Nearly a billion people depend on tropical seascapes. The need to ensure sustainable use of these vital areas is recognised, as one of 17 policy commitments made by world leaders, in Sustainable Development Goal (SDG) 14 (‘Life below Water’) of the United Nations. SDG 14 seeks to secure marine sustainability by 2030. In a time of increasing social-ecological unpredictability and risk, scientists and policymakers working towards SDG 14 in the Asia–Pacific region need to know: (1) How are seascapes changing? (2) What can global society do about these changes? and (3) How can science and society together achieve sustainable seascape futures? Through a horizon scan, we identified nine emerging research priorities that clarify potential research contributions to marine sustainability in locations with high coral reef abundance. They include research on seascape geological and biological evolution and adaptation; elucidating drivers and mechanisms of change; understanding how seascape functions and services are produced, and how people depend on them; costs, benefits, and trade-offs to people in changing seascapes; improving seascape technologies and practices; learning to govern and manage seascapes for all; sustainable use, justice, and human well-being; bridging communities and epistemologies for innovative, equitable, and scale-crossing solutions; and informing resilient seascape futures through modelling and synthesis. Researchers can contribute to the sustainability of tropical seascapes by co-developing transdisciplinary understandings of people and ecosystems, emphasising the importance of equity and justice, and improving knowledge of key cross-scale and cross-level processes, feedbacks, and thresholds.


Introduction
The well-being, prosperity, and security of over nearly a billion coastal people living in 117 countries are already at risk from degradation in marine and coastal environments (Sing Wong et al. 2022). Projections suggest that unless environmental instability and social inequity in seascapes are addressed, more than 1.3 billion people will be at risk by 2050 (Lam et al. 2020). As the marine environment is degraded, declines in regulatory services will increase human exposure to storms, flooding, and pathogens; and the supply of key provisioning and cultural ecosystem services, such as food production and tourism, will become lower and less reliable (Karki et al. 2018;Sing Wong et al. 2022).
In 2015, world leaders under the United Nations agreed on a set of 17 global commitments to secure a sustainable future for humanity. Among these Sustainable Development Goals (SDGs), SDG 14 ('Life below water') seeks explicitly to 'conserve and sustainably use the oceans, seas, and marine resources for sustainable development'.
Although key milestones were intended to be achieved by 2030, many targets of SDG 14 appear unlikely to be met Communicated by Wolfgang Cramer. (Jouffray et al. 2020). The gap between reality and SDG 14 is particularly pronounced in the tropics, where accelerating ecological degradation and increasing global demand for marine resources are placing increasingly more people at risk and the condition of marine ecosystems appears to be diverging rather than converging with the objectives of SDG 14.
In this paper, we consider how research can contribute towards achieving SDG 14, particularly in relation to the tropical, coral-rich marine seascapes in the western Asia-Pacific region where we live and work. We define a seascape as a geographically bounded, heterogeneous space encompassing coastal and marine ecosystems and societies (Fig. 1;Pittman (2017); Turner et al. (2001)). As ecological, socioeconomic, and political units, seascapes typically incorporate multiple interconnected uses, sectors, property rights systems, and governance mechanisms in addition to their biophysical and ecological dynamics. The presence of social-ecological feedbacks and human-moderated tradeoffs between different ecosystem services create a series of complex interactions between different seascape elements, making it challenging to predict their dynamics and to develop robust policy for sustainable development.
In trying to make progress towards SDG 14, we identified three overarching questions as being critical for framing future research: (1) How and why are seascapes changing?
(2) What can and should society do about these changes? and (3) How can science and society together achieve sustainable seascape futures? While these questions are applicable to many ecosystems and landscapes around the world, they are particularly important for tropical seascapes, which are less documented and less researched than most temperate marine or terrestrial systems (Bernard et al. 2021;Feeley et al. 2017;Menegotto and Rangel 2018). Drivers of change in tropical marine ecosystems are often poorly established; human impacts are harder to demonstrate and there is less baseline data; and marine tenure and ownership (and hence, responsibility) may be harder to demarcate. Achieving the goals of SGD14 will be impossible without understanding what 'conserve and sustainably use' means for fast-changing marine ecosystems and embedding or co-producing this understanding in a context of traditional knowledge and local needs. Broad-scale biodiversity conservation, for example, demands the reduction or elimination of harmful influences, the protection of areas and networks of ecologically functional habitat, and the restoration of degraded areas (Fischer Poiani et al. 2000). These activities depend on understanding both the drivers of ecosystem change and the ways in which societies can successfully intervene to influence them. Achieving SDG14 will only be possible through the adoption of deliberate management actions; and consistent with adaptive management principles, these should ideally be iteratively guided, monitored, and improved through social-ecological research (e.g. Gormley et al. 2015;Nickols et al. 2019). Thus, in this article, we present a vision for a series of interlinked research programmes, embedded in societies, that can directly interface with social, economic, and political elements of Asia-Pacific seascapes through a series of interactive feedbacks between science, policy, and practice.
Challenge 1: How and why are tropical seascapes changing? The increasing rate and magnitude of climate change, coastal development, land use change, and marine exploitation are in combination causing escalating, unpredictable, and often undesirable changes in tropical seascapes (Hughes et al. 2017a;Murray et al. 2019). For instance, the capacity of coral reefs to provide ecosystem services has declined by half since the 1950s (Eddy et al. 2021). Loss of seagrass meadows, driven by coastal development and poor water quality, has been widespread and substantial (Dunic et al. 2021); land-use change has led to the loss of 20-35% of global mangrove extent since 1970 (Friess et al. 2019); and a large majority of global coastal and marine fish stock are now fully exploited, overexploited, or depleted (FAO 2020). Nutrient discharges from the land remain problematic in many areas despite global efforts to reduce eutrophication and benthic hypoxia (Duarte and Krause-Jensen 2018).
The cumulative effects of multiple stressors on key processes that link individual ecosystems are unclear; and the influence of seascape change on fundamental longer-term biological processes, such as evolution and extinction, threatens the persistence of marine biodiversity. Moreover, as some habitats benefit at the expense of others, new processes and feedbacks are altering the provision of ecosystem goods and services and providing new opportunities and risks for society. For instance, regime shifts from coral to macroalgal dominated reefs diminish ecosystem service provision by corals and pose risks to human health, but may enhance blue carbon storage and benefit some fisheries (Hill et al. 2015;Wilson et al. 2022). More and better data, and an improved understanding of system dynamics, are needed about the nature and causes of seascape change before these different trends and interactions can be managed to achieve the sustainable conservation and use targets of SDG 14.
Challenge 2: What can and should society do about seascape change? Increasingly novel and unpredictable feedbacks between ecosystems and society are developing. Seascapes in the Western Pacific contain dynamic and complex interactions among organisms including humans, systems, and places, across diverse scales (Pittman et al. 2021;Saunders et al. 2014). Key interconnections include, for example, how 'telecoupling' links distant places through globalisation, supply chains, and markets , how changes in species composition affect human health in direct and indirect ways, and how different political jurisdictions interact to resolve the challenges of seascape management (Spijkers et al. 2018).
Governmental policies and actions are often inadequate to address SDG 14. In many countries, land and sea are governed under separate agencies, and conservation and exploitation of the same ecosystem are separated (e.g. in Australia, marine parks and fisheries management are in different governmental departments). Different policies may be poorly aligned or in conflict with one another and with SDG 14, as in the case of guidelines for small-scale fisheries within the EU (e.g. Said and Chuenpagdee (2019); noting also that EU policy and law directly affect many island territories in the Pacific, such as French Polynesia and New Caledonia). Coordination of policy and management at appropriate scales is another importance governance challenge. For example, in the Philippines, efforts to coordinate localised seascape management by 'Local Governmental Units' through broader-scale 'Bay Management Councils' had to be abandoned due to self-interest and a lack of cooperation (Pomeroy et al. 2010). SDG 14-related solutions proposed by governments to meet the needs of particular beneficiaries, such as tourism operators or commercial fishers, often ignore tradeoffs, feedbacks, and synergies among sectors and across scales (Charles 2012); and policy intended to increase the delivery of one ecosystem service can undercut the provision of others (Hodgson et al. 2019;Liu et al. 2015). For example, food provisioning involves removing fish from the sea, but reducing the abundance of fish can impact other services they provide (e.g. the regulation of algal growth on corals).
Challenge 3: How can science and society together achieve sustainable seascape futures? Deficiencies and injustices that result in reduced social-ecological sustainability can arise from past or present marine governance (Kelly et al. 2019;Nunan et al. 2020). Marine governance systems frequently marginalise specific resource users and exacerbate inequalities, which can create unjust and unsustainable outcomes and undermine the legitimacy and efficacy of policy (Engler 2020), impeding efforts towards SDG14. However, new approaches to governance that delegate management authority and decision-making to local communities or embrace new technologies (e.g. reef restoration using genetically modified corals that are heatresistant) can also displace some resource users and create winners and losers (Bennett et al. 2021;Cinner et al. 2014). Developing approaches to marine governance that fairly and efficiently address problems, while coping with rapid change and external pressures (Morrison et al. 2020), will be key for SDG 14. By adopting a more action-focused, socially aware agenda and integrating more deliberately into the wider community of policy and practice, we argue that researchers can become agents of positive change rather than merely observers of social or ecological declines.

Addressing the challenges
Each of these three challenges to achieving SDG 14 has both independent and inter-dependent aspects. Marine and coastal changes are embedded in feedback loops of anthropogenic action; climate change, overfishing, and deforestation, for example, can be seen as both cause and consequence of governance and market failures. As cascading effects ramify through social-ecological systems, they create their own dynamics that present new obstacles to effective, sustainable, and equitable governance (Rocha et al. 2018;Song et al. 2018). Thus, addressing all three challenges simultaneously and in an integrated manner is critical. Achieving SGD 14 will require revised research and policy priorities, supported by novel processes of impact-focused knowledge generation and broad consensus and collaboration across funding agencies and the research community. Research that advances progress towards SDG 14 must not only combine understandings of ecological and socioeconomic change, but also link different approaches for collecting, analysing, and integrating knowledge and data (Opdam et al. 2018). This article addresses the first piece of this problem, the question of how to focus research and enhance its contributions to social-ecological outcomes, presenting the results of a horizon scan which seeks to highlight key research priorities to help navigate the three challenges and support SDG 14. We do not seek to directly make policy recommendations in this article; our focus is deliberately on the role of researchers and the ways in which improved integration of research into practice and policy can produce improved outcomes.

Methodology and participants
We conducted a series of horizon scanning workshops run under the auspices of the ARC Centre of Excellence in Coral Reef Studies, a global consortium of universities and partners in tropical coastal and marine science and practice. We used a group collaborative process of discussion and debate to explore and synthesise our views on the future of tropical marine science, and identify research priorities. Through the process we followed the three broad aims of horizon scanning (Könnölä et al. 2012;Sutherland and Woodroof 2009) to (1) articulate credible observations about current or imminent changes in marine social-ecological systems; (2) identify new and emerging issues that may have received insufficient attention; and (3) develop ideas that could be meaningfully shared, elaborated, and discussed by the participants. Unlike more typical horizon scans, which seek to identify emerging perturbations, the agenda of our workshops was specifically focused on research and its role in the future of reef-dominated seascapes.
Participants included a diverse, gender-balanced range of leading scientists covering a wide range of marine science expertise (e.g. including experts in social, economic, ecological, and evolutionary fields) and career stages. While the majority of participants were based at Australian institutions due to COVID-19 restrictions and the preference that we meet in person, the group was considerably more diverse than institutional affiliations would suggest; it included individuals of seven different nationalities with extensive experience working in locations beyond Australia (e.g. Fiji, Indonesia, Japan, Malaysia, Papua New Guinea, Solomon Islands, East Africa, South Africa), with Indigenous communities, and with societal partners (e.g. the Great Barrier Reef Marine Park Authority, various protected area agencies, and WorldFish).
Our initial scoping process identified the three challenges discussed above as being of direct relevance to both national and local decision-makers (e.g. policy makers, governmental agencies, urban planners, protected area managers). After a series of smaller-group discussions, we collated suggestions and reduced our list of candidate research priorities to the nine summarised in this manuscript through a process of debate and discussion. Although identifying specific pathways to achieve desirable outcomes was beyond the scope of this manuscript, we compared our findings to future-oriented global frameworks (i.e. international science policy processes, many of which map out pathways to achieving their goals). This was done after, rather than before or during, the process to maintain a level of creativity and independence from existing paradigms during the process and to evaluate external validity after the process.

Research priorities
Realising the full potential of research and adaptive management in fostering and co-creating sustainable seascape futures will require a cohesive approach that addresses all three challenges. We identified nine distinct but interlocking research priorities (RPs) that capture what we perceive to be the primary ingredients of the solution. These priorities explicitly consider strategies for navigating the complexity of geographic connections, feedbacks between cause and effect, and cross-scale processes ( Fig. 2 and Table 1). They span the full range of relevant disciplines and should in theory produce knowledge at each level (or within each discipline) that is critical for addressing questions at other levels and through other disciplines. For example, an understanding of how fishing impacts fish communities (RP2) is critical for projecting food security (RP3) and clarifying the tradeoffs between other industries and fisheries (RP4); these in turn can be better regulated and modified by governance and management if they are well understood (RP6), and should provide greater and more lasting benefits to people if they are designed to be sustainable and just (RP7).
Addressing the first challenge (changing seascapes) will require new understandings of seascape dynamics and continual updates of knowledge. We identified two key research priorities that help address this: seascape evolution and adaptation (RP1), and elucidating drivers and mechanisms of change (RP2; Table 1). Instead of merely sharing reports of individually degraded coastal ecosystems (Dunic et al. 2021;Friess et al. 2019;Hughes et al. 2017b;Murray et al. 2019), a coherent approach is needed to interpret the meaning of ongoing social and ecological changes for human wellbeing (Box 1) and ecological processes across diverse scales. Coherence emerges from both short-and long-term analyses of marine social-ecological change, requiring a synthesis of evolutionary, ecological, and societal perspectives. Given the immediacy of environmental change, rapid evolutionary responses and their interactions with human influences are a particular research priority. Open questions remain about the causes and relevance of shorter-term variation in organismal physical structure, physiology or behaviour that is not due to the genome, the degree to which this variation can be transmitted between generations, and the implications of short-term responses for population genetics (Donelson et al. 2019). Successful adaptation is supported by larger population sizes; but trade-offs between relevant traits (e.g. environmental tolerance vs. growth rate) and spatial variation in the environment may limit adaptation (Coleman and Wernberg 2020;Walsh and Blows 2009). Similarly, many details of marine dispersal and connectivity and their impact on evolutionary processes remain unclear (Sanford and Kelly 2011); and little is known about how biotic interactions will further compound the complexity of these processes. For example, rapid ecological adaptation may be enabled by interspecific hybridisation (Oziolor et al. 2019) or hindered by emerging marine pathogens (Burge et al. 2014).

Box 1 Human wellbeing
Seascape condition shapes human well-being in diverse ways, including material processes that influence work and income from industries such as fishing and tourism; affective and cognitive responses to changes in important places, species, and landscapes; and changes in the composition and roles of local human communities, policies, and strategies (Gibson et al. 2019). Well-being can be understood broadly as living a life that is comfortable, secure, healthy, and happy. In addition to its material dimensions, well-being is also a function of subjective psycho-physiological processes and social relations, which are in turn influenced by individual characteristics (e.g. age, class, culture, gender, and livelihood) and social-ecological location and context (Warr 2012). Understanding human well-being is critical for achieving ecological sustainability because well-being is a dominant influence on decisions about how to use and manage seascapes, it influences self-efficacy, and it is a desired outcome of effective governance Analysis of tropical marine ecosystems and people has often concentrated on a few locations that do not always correspond to the distribution of ecological values and threats (Fisher et al. 2011;Partelow et al. 2018). However, if scientific findings are to help societies to anticipate and respond more proactively to new or emerging environmental problems (Hughes et al. 2005;Liu et al. 2007), research  Table 1 Summary of the nine critical research priorities, the challenges and focal questions they address, the minimum set of kind(s) of co-production they require, and the contributions they can make to enhancing global seascape sustainability. Three research priorities are universal to all three critical challenges; the other six priorities are more specific, but all are interconnected. Note that this table identifies research needs but does not attempt to define pathways to achieving these outcomes (which would require a larger and more inclusive exercise) Resolve key basic knowledge gaps (externalities, distal drivers, unidentified global and macro-economic, geo-political and health risks) and practical challenges (engagement, equity, legitimacy, and efficacy) with important lessons for policy and management 7. Sustainable use, justice, and human well-being 1, 2, 3 (crosscutting) • How do seascape-dependent societies prioritise risks and assess plausible futures? • What are the benefits and trade-offs associated with different responses to sustaining seascapes, and how are they distributed within and across social groups?
Advance knowledge of how environmental and social drivers in seascapes (e.g. changes in mangrove or seagrass habitats (Friess et al. 2019)) affect human wellbeing, including food security, cultural identity, livelihoods, and physical and mental health • Where and when do tipping points, feedbacks, synergies, and cascading effects (e.g. impacts of coral reef state shifts on food security for island communities) occur in seascapes? • How will emerging global trends influence the resilience of social-ecological states in seascapes?
New methods for evaluating and simulating, from diverse perspectives, transformation and fundamental systemic change; cross-scale approaches that bridge from molecules to global politics (e.g. linking the adaptive capacity of coral symbionts via sustainability of fisheries to action limiting CO 2 emissions); and a diverse ensemble of social-ecological models that can be used to explore potential implications and impacts of relevant changes at different scales will need to consider both remote and heavily peopled seascapes and explain how increasing ecological change affects human values and well-being: e.g. are there feedbacks between changes in marine habitat structure and attitudes to resource use? What are the socioeconomic implications of the potential degradation of small-scale fisheries for users of other resources in impacted seascapes? How do demographic trends influence the use of marine ecosystems? For example, Lapointe et al. (2020) found that urbanisation in the Solomon Islands affected people's ecosystem services preferences, changing the nature of their interaction with marine ecosystems. Disturbance regimes in the West Pacific are changing, and the loss and fragmentation of habitats is altering the connectivity and composition of both habitat-forming and habitat-associated taxa (Saunders et al. 2014). Integrative research is particularly needed to extend and connect understandings of the different pieces of chains of causality and make their broader relevance to people and broad-scale sustainability concerns explicit. For example, while we know that shifts in marine habitats will impact fish populations, the magnitude and relative importance of these impacts for the livelihoods and nutritional status of seascape populations remain unclear (Mellin et al. 2022). Efforts under SDG-14 to conserve and sustainably use marine resources, such as the creation of new protected areas or imposing new restrictions on fisheries, will have to take into account the changing, dynamic nature of both social-ecological relationships and the perturbations they experience (Cumming et al. 2005). Addressing the second challenge (what can and should society do) requires clarifying the complex interactions among different system components, including, for example, cross-scale interactions, feedbacks, knock-on effects, and interacting thresholds . We identified two key research priorities: understanding how seascape functions and services are produced, and how people depend on them (RP3); and costs, benefits, and trade-offs to people in changing seascapes (RP4; Table 1). Current scientific understanding cannot definitively state how changes in marine habitats (e.g. seagrass, mangroves, coral reefs) and their connections will influence broad-scale patterns in the abundance and ecological functions of marine organisms. Analysis of ecosystem functions in many marine and coastal systems has been held back by an inability to directly measure the storage or movement of energy or material ). Several recent community-level estimates of material fluxes across ecosystem boundaries reveal an extensive contribution of spatial subsidies to fish productivity (Graham et al. 2018;Morais and Bellwood 2019), but the generality of these results is unclear and improvements in both methods and underlying theory for exploring material fluxes are needed. Conversely, threats such as terrestrial sediments and climate change may impede marine ecosystem functions; preliminary studies offer surprising insights and suggest new areas for research. For example, a collapse of both algal and fish production on coral reefs can follow chronic sediment increases (Tebbett et al. 2021), while extensive coral loss may have unexpectedly small effects on fish productivity (Morais et al. 2020) and fisheries .
Changes in coastal and marine ecosystems are expected to have a profound influence on human societies, but understanding of how societies might respond is still rudimentary (Barnes et al. 2020). Seascape ecosystem services provide benefits, such as food production, shoreline stabilisation, recreation, or storm protection, to people (Díaz et al. 2015;La Notte et al. 2017). The receipt of benefits is moderated by people's needs, values, access, and sociocultural background (Daw et al. 2016;Lau et al. 2019), but how these societal variables influence benefits is little-researched. Benefits from ecosystems may also change seasonally in ways that are poorly understood and seldom incorporated in management strategies, despite their potential implications for gender equity and household well-being (Grantham et al. 2021). Research on this challenge in the Pacific region will seek to identify emerging concerns and opportunities, their impacts on equity and well-being, and possible societal responses. For example, awareness of a possible future shortfall in small-scale fisheries led to the introduction of the marine snail Rochia nilotica to Western Samoa during the period 2003-2006, resulting in the successful creation of a new fishery with substantial benefits and improved livelihood diversification for the local community (Purcell et al. 2021).
Understanding of the costs and benefits resulting from management interventions in seascapes is however still crude and is often divorced from broader decision-making. Key decisions are often made in the absence of publicly available cost-benefits analyses. When these are available, they generally do not account adequately for non-market values (Akter et al. 2014). Tradeoffs between sectors are insufficiently documented, particularly where they link land and sea; and better understandings of the underlying values at stake, and the causes and social and ecological effects of decisions over space and time, are needed to inform policies that create fewer losers. For example, public subsidies for agriculture, mining, and forestry in catchments draining into Australia's Great Barrier Reef (GBR) increase sediment and pollutant loads, reducing the quality of the natural environment and affecting tourism and fisheries (Brodie and Pearson 2016). An improved understanding of the complex interactions that underpin systemic responses, and how these interactions enhance or reduce desirable system resilience, will be essential for informed comparisons of alternative management strategies (Grafton et al. 2019).
Addressing the third challenge (how science and society can together improve sustainability) requires research that identifies which capacities must be developed and what actions undertaken at different scales, and by whom, to ensure a just and sustainable future for seascapes. We identified two key research priorities: improving seascape technologies and practices (RP5), and learning to govern and manage seascapes for all (RP6; Table 1). Sustainability solutions can arise at a local level -through the actions of individuals, communities, and industries -and at regional, national, and global levels, through the creation and negotiation of norms, laws, policies, and economic systems that incentivise and support responsible and sustainable interactions between people and ecosystems (Charles 2012;Orach et al. 2017). Research that identifies and tests novel, sustainable interventions that help populations to adapt while continuing to enjoy key needs and values is increasingly necessary. At present, for example, seawalls are the dominant response to erosion on coral coasts, while nature-based solutions that may entail far fewer costs and risks remain neglected due to a lack of knowledge about their technical and social feasibility. Implementation of such solutions requires intensive, coordinated engagement with local communities and real-time, high-resolution monitoring, mapping, and modelling to identify biophysical causes of seascape changes and their solutions (Hickey et al. 2020). Research that develops observing tools and technologies, information systems, analysis, and forecasts can be further supported by coordination and leadership from intergovernmental initiatives such as the Global Ocean Observing System (GOOS; https:// www. gooso cean. org/).
Addressing uncertainty about changes and interactions, as well as about effective and fair responses, requires knowledge creation from diverse sources to be integrated throughout seascape governance processes so that research can iteratively learn from, respond to, and inform governance (and vice versa). Policymakers, managers, and communities continue to struggle with designing institutions and making decisions that reflect the environmental complexity and human diversity of seascapes. Government departments are often siloed; cumulative assessment, strategic and adaptive planning tools are not always implemented well (Foley et al. 2017); and novel solutions are undermined when influential actors are not engaged in decision-making (Turner et al. 2016). Integration across the relevant communities of researchers, policy makers, managers, and residents should ideally follow procedural, professional, evaluative, judicial, instrumental, and external controls that support scientific and decision-making integrity by individuals and agencies (Colloff et al. 2021). The question of how to identify and assist keystone actors to modify their behaviours (e.g. through diplomacy, supply chains, diffusion of information and technology, and/or niche behaviours), and embed them in stable routines and practices, is a critical research frontier that is essential to navigating emerging seascape conflicts and avoiding potentially maladaptive interventions (Abbott et al. 2016;Österblom et al. 2017). Similarly, rapidly developing bioprospecting and energy proposals (energy, minerals, chemicals, and pharmaceuticals) and adaptive interventions (restoration, geo-engineering, and bioengineering) in tropical seascapes are raising important questions about governance, power, ethics, ownership, and equity that require urgent resolution .
Research is also needed to understand how change in governance systems is influenced by entrenched power asymmetries within and across national, regional, and global levels; by similarly path-dependent systems of economic production and distribution; by systemic risks; and by assumptions about change and resilience (Cumming and Peterson 2017;Morrison et al. 2019). These influences on governance are further modulated by 'bad faith' actors (e.g. lobby campaigns, groups with vested interests in particular sectors), disinformation, and self-interest. By evaluating alternatives and projecting outcomes, and by engaging directly with key actors, research can support SDG 14 by spanning the gap between powerful actors in the mainstream and weak and marginal actors in the margins to help both sets of actors identify new and alternative pathways to desirable futures (Tomich et al. 1998).
In addition to priorities that fall mainly under individual challenges, we identified three cross-cutting priorities that address all three challenges: sustainable use, justice, and human well-being (RP7); bridging communities and epistemologies (world views) for innovative, equitable, and scalecrossing solutions (RP8); and informing resilient seascape futures, primarily by using models and related methods (e.g. scenario planning) to understand seascape dynamics and provide decision support (RP9). As explained in Table 1, RP7 and RP8 are integral to the process of transdisciplinary research in each of the other priority areas and understanding their role in sustainability will be critical for achieving SDG14. The use of a diverse range of models and methods (RP9), across a gradient from the fully quantitative through to primarily qualitative, will be vital for explaining and developing approaches for testing and refining hypotheses about interactions, feedbacks, and other complex phenomena that occur over broad extents and long time periods (Lenton 2020).
The experience of well-being and its dependence on seascapes varies significantly across individuals and societies. Further research is needed to understand what constitutes well-being; how it changes over time; and how different aspects of human well-being and anthropogenic impacts on ecosystems are inter-related. Both exposure to disturbance and human response capacity are intricately connected to access to resources (Finkbeiner et al. 2018), which at a community level is fundamentally a question of equity and justice. Thus, research on how equity influences decisionmaking is fundamental to understanding societal responses to ecological change. An increasing amount of research is showing that research process is critical for successful outcomes. Knowledge co-production research and practice hold potential for innovative, equitable, and effective sustainability solutions (Chambers et al. 2021;Zurba et al. 2021), but many unanswered questions remain about how to most effectively engage diverse stakeholders, recognise unique knowledge (Aminpour et al. 2021;Zurba et al. 2021), and build adaptable knowledge networks, institutional support, and resourcing to ensure a meaningful and Indigenous community-led translation of research into action (Austin et al. 2019;Thornton and Scheer 2012). Gaps remain between high-level commitments and policy and practice that meaningfully bridge diverse epistemologies ('ways of knowing') (Witter and Satterfield 2019), suggesting a lack of attention to the roles of power and politics in co-production outcomes, including failures (Turnhout et al. 2020). Meaningful coproduction remains nascent in marine science (Hedge et al. 2020) and ocean commons (Vierros et al. 2020).
The interdisciplinary, social-ecological science needed to proactively build sustainable seascapes requires an interplay of empirical data, models, and theory that connect specific systems and locations at different scales and different levels of generality Meyfroidt et al. 2018). Ecosystem models are widely used to support management decisions; for example, data for larval dispersal (Paris et al. 2013) have been extended to understand the fisheries benefits of Marine Protected Areas from larval spillover (Krueck et al. 2017), but these models do not generally incorporate human decision-making.
The contributions of explicitly social-ecological models to seascape sustainability range from stringent but highly specific prediction through to simpler but very general conceptual aids and tests of heuristics. Kasperski et al. (2021) grouped social-ecological fisheries models into seven categories: end-to-end models, conceptual models, bioeconomic models, management strategy evaluations, fisher behaviour models, integrated social vulnerability models, and regional economic impact models. Other models of relevant social and socioeconomic processes include (for example) models of the influence of learning on the effectiveness of different management styles (Lindkvist and Norberg 2014), and decision-making in multi-agent systems (Müller et al. 2013). However, linking biophysical ecosystem functions and social drivers of human behaviour to one another, and to social outcomes, remains a significant research challenge.
Taken as a group, there remain many questions about how these research priorities could be addressed in practice, in part because they are context dependent. We regard identification of shared research questions as a critical step towards understanding how existing research initiatives can contribute to the SDGs, where priority areas fall for future research, and where diverse teams and disciplines can work together. Our research priorities for the future contribute key insights in support of the holistic vision of the UN SDGs (Lynch et al. 2020), including addressing whole of system knowledge gaps critical to the goals of Sustainable Cities and Communities (SDG 11), Climate Action (SDG 13), and Life Below Water (SDG 14). They also relate closely to other global initiatives and assessments. This is not an appropriate place for a full listing of such initiatives, but some well-known examples with high relevance for tropical seascapes include the International Panel on Biodiversity and Ecosystem Services (IPBES, Fig. 3), the Program on Ecosystem Change and Society (PECS), and the Coral Triangle Initiative (CTI). IPBES seeks to generate information to monitor and promote both biodiversity conservation and sustainable use of ecosystem services; PECS shares the same goal, but through a more place-focused approach; and the CTI was intended to stimulate improved management of natural resources for sustainable livelihoods across one of the ocean's most biodiverse regions, the Coral Triangle. Our findings can help these initiatives to understand and frame how research can contribute more effectively to a desirable future. We acknowledge that identifying pathways to impact requires a much larger and more inclusive exercise that is beyond the scope of this synthesis.

Discussion and conclusions
While a concerted global effort to sustain life below water (SDG 14) is urgently needed, many nations have limited power and capacity to respond effectively to current environmental trends (Barlow et al. 2018;Morrison et al. 2020). By highlighting issues of environmental-social justice and equity and the critical role that they play in seascape sustainability, and engaging deeply with partners on the ground, researchers have the potential to create new ideas, networks, practices, norms, and solutions for the sustainability of tropical seascapes. Solving emerging problems in seascape conservation and management will require intensive learning processes that generate new knowledge and partnerships across a wide diversity of knowledge systems, and that build effective processes for transforming knowledge into action (Clark et al. 2016). For example, Marine Protected Areas (MPAs) have long been considered a critical element of effective seascape conservation, with a considerable body of research demonstrating how MPAs can support both conservation and livelihood objectives of SDG 14 (Di Lorenzo et al. 2020;Edgar et al. 2014;Fox et al. 2014). With increasing criticism by stakeholders and researchers of decisions about MPA location, creation, and management (Hogg et al. 2017;O'Leary et al. 2018), research has also contributed usefully to innovative co-management solutions that benefit both people and ecosystems (Smallhorn-West et al. 2020).
We have described nine inter-related research priorities that we regard as central to ensuring the future sustainability of seascapes around the world. These priorities are linked by many important cross-cutting research themes. For example, understanding the interplay of local and regional influences on ecological communities, and the feedbacks between local and regional social, ecological, and social-ecological dynamics, will be critical for efforts to build local resilience to ongoing threats such as anthropogenic climate change, over-fishing, and pollution (Hughes et al. 2017a). Similarly, changes in human wealth and lifestyles, and related demands for marine resources, will affect not only patterns of marine resource consumption and pollution but also the nature of ecosystem service demands placed on marine ecosystems and the ways in which societies evaluate and resolve the tradeoffs between different ecosystem services (Crona et al. 2020;Lapointe et al. 2019). Against a backdrop of increasing urbanisation and coastal settlement, research focusing on SDG 14 must anticipate future knowledge needs and the potential for rapid changes in marine access and resource requirements as well as the creation of new forms of social injustice (Bennett et al. 2021). Modified from Díaz et al. (2015) and a recent summary of knowledge gaps (Mastrángelo et al. 2019). Numbers correspond to research priority numbers in Table 1; arrows highlighting the importance of space and scale are not intended as axes Research agendas are created by people who are embedded within particular cultures and social strata, including both researchers and funders, and the questions that individuals and groups consider to be important or interesting strongly reflect their own values, background, and preferences (Watkins and Harvey 2020); we do not expect to be immune from this effect. The only proven route to overcoming bias in science -and to achieving broader impact -is to work in diverse, multi-cultural teams and engage strongly with other members of society (i.e. outside the research group) during the research process (Smith-Doerr et al. 2017). Thus, we strongly support critical discussion of this framework and the arguments made by others for transdisciplinary marine and coastal science that engages in co-design and co-production between scientists and society throughout the process of identifying problems, formulating and developing questions, research design, analysis, communication, and translation to action (Chambers et al. 2021;Nakata 2002).
There is clearly no single panacea for marine and coastal sustainability, and making better progress towards SDG 14 in the western Pacific will require a complex and challenging series of interventions. Environmental degradation and rising inequality around the world suggest limited success for standard research approaches promoting science as a tool to solve environmental problems. We nonetheless believe that research has critical roles to play in the generation of new knowledge, the expansion and sharing of grassroots innovations (Seyfang and Smith 2007), and the engagement of broader society to co-develop a nuanced, evidence-based understanding of seascapes and their futures. Most of the underlying social, economic, and ecological problems currently faced by seascapes cannot be resolved by the same thinking that created them. Cross-cutting, transdisciplinary research can generate missing knowledge about complex social-ecological dynamics while helping to identify locally feasible solutions and supporting cross-scale actions to build resilience in both human and ecological communities Folke et al. 2016).
Author contribution All authors contributed to workshops and discussions leading to the development of this framework. GSC led the writing, review, and editing of the paper with contributions from all co-authors.
Funding Open Access funding enabled and organized by CAUL and its Member Institutions This research was supported by funding from the Australian Research Council's Centre of Excellence for Coral Reef Studies under grant CE140100020.
Data availability All data are available in the main text.

Competing interests The authors declare no competing interests.
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http:// creat iveco mmons. org/ licen ses/ by/4. 0/.