Trophic Dynamics and Isotope Analysis in Estuarine Ecosystems
Summary
Estuarine ecosystems occupy the dynamic interface between freshwater and marine environments, supporting highly productive food webs and complex trophic interactions. Trophic dynamics in these settings are governed by the flow of organic matter and nutrients from primary producers—such as microalgae, seagrasses and mangrove detritus—through successive consumer levels, from benthic invertebrates and small fishes to top predators. Estuaries also export organic subsidies to adjacent coastal waters, reinforcing the connectivity of coastal systems. Stable isotope analysis has emerged as a pivotal tool to unravel these pathways: by measuring the naturally occurring ratios of carbon (13C/12C) and nitrogen (15N/14N) isotopes in organism tissues, researchers can infer dietary sources, trophic positions and niche breadths without extensive gut-content analysis. This approach permits long-term integration of feeding habits and spatial shifts in resource use, while quantifying niche overlap and partitioning among coexisting species. Applications extend to assessing the impact of anthropogenic stressors—such as nutrient loading, habitat alteration and climate change—on estuarine food-web structure, informing evidence-based conservation, fisheries management and ecosystem restoration efforts worldwide.
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Trophic Dynamics and Isotope Analysis in Estuarine Ecosystems publication trend
The graph below shows the total number of articles in trophic dynamics and isotope analysis in estuarine ecosystems across all publications each year (not limited to Nature Index journals).
Technical terms
Trophic dynamics: The processes governing the transfer of energy and nutrients through food-web compartments from producers to consumers.
Stable isotope analysis: A method that measures ratios of non-radioactive isotopes (e.g., 13C/12C, 15N/14N) to infer dietary sources and trophic positions over time.
Isotopic niche: The multidimensional space defined by an organism’s stable isotope signatures, reflecting its dietary breadth and resource use.
Resource subsidy: The transfer of energy or materials (such as organic matter) from one ecosystem compartment to another, influencing recipient community structure.
References
- Spatial diet overlap and food resource in two congeneric mullet species revealed by stable isotopes and stomach content analyses. Community Ecology (2018).
- Ecosystem Services Transcend Boundaries: Estuaries Provide Resource Subsidies and Influence Functional Diversity in Coastal Benthic Communities. PLOS ONE (2012).
- Isotopic niche of the catfishes Bagre bagre and Genidens barbus in a coastal area of south-eastern Brazil. Biota Neotropica (2018).
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