Although formal institutions, particularly legal instruments which protect coastal ecosystems exist in many coastal countries, their contribution to enhancing the social-ecological resilience of mangroves has been limitedly explored. This study investigated how the synergies between legal instruments and local deities existing in coastal countries can contribute to enhancing the resilience of mangroves, using Benin Republic (West Africa) as a case study. The study employed seven principles of resilience derived from the literature to assess the existence, application, and respect of the legal framework that enhances the resilience of mangroves in Benin. Various data were collected through documents review (18 laws comprising 2727 articles), in-depth interviews (n = 18), focus groups discussions (n = 9) and drone-based field observations. Out of the 2727 articles reviewed, 93 articles summarized into 20 provisions were found to potentially enhance the resilience of mangroves, as they aligned with the considered principles of resilience. Although decrees, orders and law enforcement agencies exist to ensure the application of these provisions, challenges related to inadequate sensitization, insufficient resources, weak collaboration among institutions and land-related issues compromise their enforcement locally. Interestingly, the introduction of local deities in coastal areas, particularly for mangrove conservation facilitates the respect of some key provisions, notably the ban on mangrove wood cutting. This study identifies legal instruments as one of the important tools that can be used to enhance the social-ecological resilience of mangroves and calls for the incorporation of traditional beliefs in their effective enforcement to foster compliance and promote the sustainability of the ecosystem.

The potential of agent-based modelling (ABM) for developing theory has been recognized, yet methodologies are lacking. Building theories of social-ecological systems is challenging because of complex causality, context-dependence, and social-ecological interdependencies. We propose an approach that addresses these challenges through combining case-based empirical research with ABM in a collaborative modelling process. In-depth empirical research is essential for identifying a puzzle and potential explanations thereof, and for recognizing context and social-ecological interdependencies. Collaborative model building and analysis enables careful abstraction and reflection, and allows further exploring and testing the emerging theory in dynamic contexts, leading to better-grounded and transparent assumptions and theories. We call this approach BIM (Being In the Middle) and articulate it through three features: contextually embedded, collaboratively abductive and empirically stylized. We highlight how BIM facilitates new interdisciplinary avenues for discovering social-ecological interdependencies, discuss how it can be applied and what challenges and frontiers lie ahead.

Understanding the mechanisms underlying nutrient (nitrogen and phosphorus) and carbon cycling in reefs is critical for effective management. Research on reef nutrient and carbon cycling needs to account for (i) the contributions of multiple organisms, (ii) abiotic and biotic drivers, and (iii) a social-ecological perspective. In this paper, we review the mechanisms underlying nutrient and carbon cycling in reef social-ecological systems and analyse them using causal loop analysis. We identify direct and indirect pathways and feedback loops through nutrient and carbon cycles that shape the dominant benthic state of reefs: coral, algal, and sponge-dominated states. We find that two of three anthropogenic impact scenarios (size-selective fishing and land use change) have primarily negative consequences for coral and macroalgae via the nutrient and carbon cycles. A third scenario (runoff) has fewer negative impacts on sponges compared to other benthos. In all scenarios, frequent positive feedback loops (size-selective fishing: 7 of 12 loops; runoff: 6 of 9 loops; land use change: 8 of 11 loops) lead to system destabilization; however, the presence of multiple loops introduces avenues whereby reefs may retain coral dominance despite anthropogenic pressures. Context-specific information on the relative strength of loops will be necessary to predict future reef state.

Non-technical summary. Ensuring more equitable transformations requires addressing how different contextual dimensions of identity, such as gender and class, hinder equity. However, previous analyses on equity have addressed these dimensions separately. We suggest advancing beyond these methods by integrating intersectional analysis into the distributive, procedural, and recognition aspects of equity when examining social–ecological transformations. A review of 37 studies on social–ecological transformation shows that social–ecological transformation scholars commonly addressed social, spatial, and environmental transformations. In contrast, few studies have gone into depth in analyzing the reasons for power imbalances. We encourage scholars to use critical questions to reflect on social–ecological transformations collectively.

Technical summary. Ensuring equity in social–ecological transformations involves understanding how aspects of identity – such as gender, age, and class – affect experiences on the path to sustainability. Previous studies have often focused on one dimension of difference, but an intersectionality framework is essential for recognizing interconnected identities. In this paper, we review 37 empirical studies on social–ecological transformations, identifying key assets of transformation, including economic, social, cultural, political, spatial, environmental, and knowledge-based assets. We apply an analytical framework based on intersectional equity, incorporating intersectionality in equity analysis, which examines how power dynamics contribute to inequities in distribution, procedure, and recognition. Our findings show that social, spatial, and environmental assets of transformation are the most frequently mentioned in our sampled literature, together with benefits, costs, inclusiveness, and knowledge of equity dimensions. Power imbalances occurred the most often, while different aspects of identity were mentioned only in two-thirds of the studies. We believe an intersectional equity approach will help better conceptualize transformation concerning (in)equity. Based on our reflections, we suggest critical questions encouraging scholars to evaluate them iteratively with an interdisciplinary group.

Social media summary. An intersectional equity approach is key to just social–ecological transformations. We review 37 studies to show why.

In an increasingly urbanized world, the concepts of ecosystem services and nature-based solutions can help tackle grand challenges. However, ambiguity in their definitions and in the relationship between the two concepts complicates comprehensive research efforts as well as their effective application in policy and planning in urban systems. This paper presents a framework to clarify and explicitly relate the two concepts, enhancing their applicability in the management of urban challenges. Within the framework, addressing urban challenges serves as the starting point for the development and implementation of nature-based solutions. Nature-based solutions alter the flows of ecosystem services that are produced by an ecosystem by altering the performance of the ecosystem or by changing how people engage with the ecosystem. This results both in changes in the target ecosystem services, as well as non-targeted ecosystem services, leading to benefits. Using two illustrative case studies, we show how the framework can be applied to two urban challenges that are expected to increase in intensity in cities across the world: stormwater management and urban heat stress. Moreover, we highlight key research topics that will benefit from more integrated use of nature-based solutions and ecosystem services. The framework helps emphasize co-benefits, and can be used to help make co-benefits and multifunctionality explicit in urban decision-making and planning processes.

Millions of people around the world depend on the ecosystem services produced by rocky and coral reef ecosystems, including nutrition, aesthetic value, and coastal protection. Rocky and coral reefs also contribute to critical global and regional processes through the cycling of nitrogen, phosphorus, and carbon. The increased stress experienced by reefs in the Anthropocene threatens their ability to provide vital ecosystem services. This study investigates bundles of ecosystem services, ecosystem services that occur together, to identify trade-offs and synergies among services produced by coral reefs. To do this, we bring together estimates of seven ecosystem services: productivity, nitrogen cycling, phosphorus cycling, inorganic carbon cycling, aesthetic value, nutritional value, and coastal protection. We use correlations analysis to understand trade-offs and synergies between these seven ecosystem services and cluster analysis to identify clusters of reefs with distinct suites of ecosystem services, or ecosystem service bundles. Our analysis reveals (1) synergies and trade-offs among the seven ecosystem services, and (2) three distinct clusters of reefs, which differ on the basis of their overall and relative delivery of ecosystem services. Differences in service production among the clusters appear to be linked to differences in key ecological traits, including total reef fish biomass and species richness. Similar applications of ecosystem service bundles analysis in other marine and coastal systems could result in improved understanding of the spatial distributions and relationships between marine ecosystem services, which is a key input to marine policy.

Meeting the objectives of sustainable fisheries management requires attention to the complex interactions between humans, institutions and ecosystems that give rise to fishery outcomes. Traditional approaches to studying fisheries often do not fully capture, nor focus on these complex interactions between people and ecosystems. Despite advances in the scope and scale of interactions encompassed by more holistic methods, for example ecosystem-based fisheries management approaches, no single method can adequately capture the complexity of human–nature interactions. Approaches that combine quantitative and qualitative analytical approaches are necessary to generate a deeper understanding of these interactions and illuminate pathways to address fisheries sustainability challenges. However, combining methods is inherently challenging and requires understanding multiple methods from different, often disciplinarily distinct origins, demanding reflexivity of the researchers involved. Social–ecological systems’ research has a history of utilising combinations of methods across the social and ecological realms to account for spatial and temporal dynamics, uncertainty and feedbacks that are key components of fisheries. We describe several categories of analytical methods (statistical modelling, network analysis, dynamic modelling, qualitative analysis and controlled behavioural experiments) and highlight their applications in fisheries research, strengths and limitations, data needs and overall objectives. We then discuss important considerations of a methods portfolio development process, including reflexivity, epistemological and ontological concerns and illustrate these considerations via three case studies. We show that, by expanding their methods portfolios, researchers will be better equipped to study the complex interactions shaping fisheries and contribute to solutions for sustainable fisheries management.

Archetype analysis is a promising approach in sustainability science to identify patterns and explain mechanisms shaping the sustainability of social-ecological systems. Although considerable efforts have been devoted to developing quality standards and methodological advances for archetype analysis, archetype validation remains a major challenge. Drawing on the insights from two international workshops on archetype analysis and on broader literature on validity, we propose a framework that identifies and describes six dimensions of validity: conceptual; construct; internal; external; empirical; and application validity. We first discuss the six dimensions in relation to different methodological approaches and purposes of archetype analysis. We then present an operational use of the framework for researchers to assess the validity of archetype analysis and to support sound archetype identification and policy-relevant applications. Finally, we apply our assessment to 18 published archetype analyses, which we use to describe the challenges and insights in validating the different dimensions and suggest ways to holistically improve the validity of identified archetypes. With this, we contribute to more rigorous archetype analyses, helping to develop the potential of the approach for guiding sustainability solutions.

The ocean provides benefits to coastal communities around the world, however, the depth and complexity of people's interactions with marine ecosystems are not well represented in many marine management initiatives. Many fisheries are managed to maximize provisioning value, which is readily quantified, while ignoring cultural values. An ecosystem services approach that includes both provisioning and cultural services will enable managers to better account for the diverse values marine fisheries provide to coastal communities. In this study, we assess community values related to a top fished species, the Mexican chocolate clam, Megapitaria squalida, in Loreto, Baja California Sur, Mexico. We conducted an exploratory analysis based on 42 household surveys, and found that community members perceive multiple provisioning and cultural benefits from the clam, including community economic, historical, and identity values. Despite reporting infrequent harvest and consumption of clams, participants perceive the species as an important part of community identity, highlighting the role of Mexican chocolate clams as a cultural keystone species in the Loreto region. Fisheries management that recognizes the full range of ecosystem services a species contributes to coastal communities will be better equipped to sustain these diverse values into the future.

Understanding how institutions operate is crucial to the protection of marine ecosystems and the communities that depend on them. We define institutions as the rules, norms, and practices that govern resource users’ interactions with common-pool resources, and recognize that both formal and informal institutions govern marine fisheries around the world. Institutional diversity can enhance social-ecological system resilience by providing multiple ways of responding to change. Identifying institutions and their effects on fishing practices is key to improving management for sustainable fisheries. In this study, we use a mixed methods approach focused on the institutions guiding fishing activities of the Mexican chocolate clam, Megapitaria squalida, in Loreto Bay National Park, Baja California Sur, Mexico. By synthesizing long-term observations and semi-structured interviews with fishers and other key stakeholders, we identify the formal and informal rules and norms governing fishing behavior, explore their effects on fishing practices, and illuminate ways in which formal and informal institutions may work in tandem. We find that both formal and informal institutions shape fishing practices within the chocolate clam fishery. Some reinforce one another, and others are in conflict. The diverse institutions governing the chocolate clam fishery create a complex web of sometimes conflicting rules and social norms that fishers navigate every day. We contend that greater community participation in management, via polycentric and collaborative governance that accounts for and legitimizes local norms in a system like co-management, would foster enhanced sustainability of the chocolate clam fishery and the benefits it provides to coastal communities.