Christine M. Beitl

Mangroves are a critical habitat that provide a suite of ecosystem services and support livelihoods. Here we undertook a global analysis to model the density and abundance of 37 commercially important juvenile fish and juvenile and resident invertebrates that are known to extensively use mangroves, by fitting expert-identified drivers of density to fish and invertebrate density data from published field studies. The numerical model predicted high densities throughout parts of Southeast and South Asia, the northern coast of South America, the Red Sea, and the Caribbean and Central America. Application of our model globally estimates that mangroves support an annual abundance of over 700 billion juvenile fish and invertebrates. While abundance at the early life-history stage does not directly equate to potential economic or biomass gains, this estimate indicates the critical role of mangroves globally in supporting fish and fisheries, and further builds the case for their conservation and restoration.

Agriculture is one of the most culturally and economically important livelihood activities of the Ganges River Delta. In recent years, coastal communities have experienced longer dry seasons and salinity intrusion, which is exacerbated by registration errors in land tenure that have led to increasing encroachment by external interests in the Dacope sub-district of Bangladesh. These challenges threaten to undermine the sustainability of smallholder access to canals that are collectively managed as common-pool resources (CPR). This paper explores how identity and collective action may empower farmers to secure irrigation access in the face of external pressures. Drawing primarily on qualitative data collected through focus group discussions with farmers in Dacope, our findings reveal that identity serves as a powerful force driving collective action and the sustainability of the agricultural community. A shared occupational identity fosters a sense of belonging and collective responsibility among farmers to maintain water flow through construction, annual dredging, and temporary dry-season protections. However, despite a strong commitment to maintaining their irrigation system, challenges remain in farmers’ ability to combat the powerful interests of wealthier members of the community that threaten to undermine the viability of the irrigation commons. Thus, formal support through policy and legislative avenues is also necessary to safeguard common property rights against the threat of privatization and illegal occupation of canals. These findings further underscore the need for more research on how collective identity may strengthen collective action, livelihoods, and sustainability in the absence of strong institutional arrangements that uphold community rights and access to common-pool resources.

Much research has raised concerns about how a warming planet will interact with natural cyclical climatic variations, and the implications for the resilience and vulnerability of coastal communities. As the anticipated effects of climate change will continue to intensify, it is necessary to understand the response and adaptive capacity of individuals and communities. Coastal communities in Ecuador have evolved in an environment of such cyclical climatic variations referred to as El Niño-Southern Oscillation (ENSO) and La Niña. These climatic events are frequently characterized by extreme variations in precipitation, violent storms, and coastal flooding during El Niño and lowered sea water temperatures and drought during La Niña. This paper draws on survey data and long-term ethnographic research in Ecuadorian coastal communities to explore how fishers understand the impacts of ENSO and implications for their livelihood decisions and resilience to climate variability. The results suggest that fishers along the coast of Ecuador understand and respond differentially to the impacts of ENSO depending on social, cultural, environmental, and geographical factors. These differential levels of response suggest that livelihood diversification may uphold social resilience, which has implications for how coastal communities may adapt to the increasingly harsh weather conditions predicted by many climate models. Our findings further suggest that the impacts of El Niño are more salient than the impacts of La Niña; these findings have significant implications for fisheries management and science communication.

Mangroves are a critical coastal habitat that provides a suite of ecosystem services and supports livelihoods. We undertake the first global analysis to estimate density and abundance of 37 commercially important fish and invertebrates that are known to extensively use mangroves. Geomorphic mangrove type, sea surface salinity and temperature, and length of mangrove forest edge were important in predicting the density of commercial fish and invertebrates, with deltaic systems supporting the highest densities. The model predicted high densities throughout parts of southeast Asia, the northern coast of South America, the Red Sea, and the Caribbean and Central America. Application of our model onto the global mangrove extent, estimates that mangroves support the annual abundance of nearly 800 billion young-of-year fish and invertebrates contained in our model. Our results confirm the critical role of mangroves globally in supporting fish and fisheries, and further builds the case for their conservation and restoration.

Our research addresses knowledge integration for the good governance of the environment and the oceans: (a) through a comprehensive legal, political science, and anthropological analysis; and (b) by providing an examination of crucial research foci and research gaps in the fields of environmental and marine governance, along the North–South divide. Our subsequent critical synopsis reveals how existing research within each discipline offers complementary insights for future research. We concludes with a call for further testing of tools, approaches, and methods to enable comprehensive research on the conceptualization of knowledge integration.

Environmental change requires individuals and institutions to facilitate adaptive governance. However, facilitating adaptive governance may be difficult because resource users’ perceptions of desirable ways of life vary. These perceptions influence preferences related to environmental governance and may stem from the ways individuals subjectively value their work and their connections to their environment. This paper uses a value-based approach to examine individual and institutional preferences for adaptive governance in Carelmapu, Chile. We show that two groups had different value frames rooted in divergent ontologies which influenced their actions related to adaptive governance, creating conflict.

The bivalve mollusk, Anadara tuberculosa (Black Shell, in Spanish Concha Prieta), is found on America’s Pacific coast, where it is harvested for subsistence and commercial markets. This paper aims to diagnose the performance of the black shell’s value chain. We also identify several challenges that must be addressed to improve the sustainability of the black shell fishery in Ecuador. The applied methodology was quantitative and descriptive. Its design was non-experimental, field, cross-sectional and ex post facto. The investigation was carried out from January to October 2019 in the Jambelí archipelago, El Oro province, Ecuador. The study population consisted of 565 individuals, shellfish collectors, shellfish associations managers, traders, and restaurants from the A. tuberculosa production chain. The sample size was estimated at 222 informants. The type of sampling used was probabilistic, random, stratified, and with proportional allocation, with an effective participation rate of those selected of approximately 80%. The questionnaire was applied personally through the structured survey method, in writing, in the work area, and with their consent. The performance of the value chain was diagnosed in the dimensions of productivity, competitiveness, and quality of life, reaching a 75.1% index, a result that indicates that the value chain has a moderate to good performance level. The competitiveness dimension reached the highest performance, followed by productivity. Quality of life was the dimension with the lowest performance. The value chain can be improved if the following challenges are met: (1) Restoration of the mangrove ecosystem, (2) Promotion of low-intensity shellfish aquaculture, (3) Good sanitary management and purification, (4) Promotion of value-focused ventures, (5) Strengthening of organizations and agreements for the use and custody of mangroves, and (6) Strengthening of institutions that contribute to the advancement of these challenges.

The bivalve mollusk, Anadara tuberculosa (Black Shell, in Spanish Concha prieta, "CP"), is found on America's Pacific coast, where it is harvested for subsistence and commercial markets. This paper aims to diagnose the performance of the black shell's value chain. We also identify several challenges that must be addressed to improve the sustainability of the black shell fishery in Ecuador. The descriptive methodology was quantitative, with a non-experimental, field, cross-sectional, and ex post facto design. Similar questionnaires were designed, validated, and applied to each link in the production chain to collect information. The performance of the value chain was diagnosed in the dimensions of productivity, competitiveness, and quality of life, reaching a 75.1% index, a result that indicates that the value chain has a moderate to good performance level. However, the value chain can be improved if the following challenges are met: 1) Restoration of the mangrove ecosystem, 2) Promotion of low-intensity shellfish aquaculture, 3) Good sanitary management and purification, 4) Promotion of value-focused ventures, 5) Strengthening of organizations and agreements for the use and custody of mangroves, and 6) Strengthening of institutions that contribute to the advancement of these challenges.

Mangrove forests support high levels of biodiversity that form the basis of subsistence and livelihoods in coastal communities worldwide. This paper explores the range of marine products consumed by households in a mangrove-dependent community in Ecuador. In ethnobiological interviews, 48 species of fish, mollusks, and crustaceans were named, of which 85% are harvested directly by the inhabitants and exchangedbetween households. Findings also suggest that changes in consumption patterns in the past 10 years reflect broader socio-environmental trends, such as a decline in available resources, population growth, and conflicts with industrial fishing fleets. A more systematic and detailed analysis is needed to advance understanding about the relationship between subsistence and environmental change. Los manglares soportan altos niveles de biodiversidad y son la base de la subsistencia de comunidades costeras en el mundo. Este artículo explora la gama de productos marinos consumidos en una comunidad dependiente de manglares en Ecuador. En las entrevistas etnobiológicas, se nombraron 48 especies de peces, moluscos y crustáceos, de los cual, 85% son cosechados directamente por los moradores e intercambiados entre las casas. Los hallazgos también sugieren que, en los últimos 10 años, había cambios en los patrones de consumo que reflejan tendencias socio-ambientales más amplias, tales como una disminución de los recursos disponibles, el aumento poblacional y los conflictos con las flotas pesqueras industriales. Se necesita un análisis más sistemático para avanzar la comprensión sobre la relación entre subsistencia y cambio ambiental.