Fish Assemblage Dynamics in Transitional Water Ecosystems
Summary
Transitional water ecosystems—such as estuaries, coastal lagoons and wetland complexes—lie at the interface of marine and freshwater environments and exhibit pronounced spatio-temporal variability in salinity, hydrodynamics and habitat structure. Fish assemblages in these systems are shaped by gradients of salinity, tidal exchange and habitat connectivity, which in turn influence species composition, life-history strategies and trophic interactions. Lagoon residents complete their entire life cycle within confined basins, whereas marine migrants and estuarine transients exploit these habitats as nurseries or feeding grounds. Seasonal shifts in assemblage structure reflect reproductive cycles and offshore migrations, while anthropogenic pressures—ranging from nutrient loading and hydrological alterations to artisanal fisheries—modify community resilience and ecosystem function. Understanding assemblage dynamics in transitional waters is critical for conservation, fisheries management and habitat restoration, especially in light of accelerating climate-driven changes in sea level and precipitation patterns. Integrative approaches that combine field surveys, predictive modelling and multimetric indices are emerging as powerful tools to assess ecological status and guide sustainable management across global coastal networks.
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Fish Assemblage Dynamics in Transitional Water Ecosystems publication trend
The graph below shows the total number of articles in fish assemblage dynamics in transitional water ecosystems across all publications each year (not limited to Nature Index journals).
Technical terms
Functional guild: A grouping of species that share similar roles in the ecosystem, such as feeding mode or habitat use.
Hydrological connectivity: The degree to which water movements link habitats, influencing migration and gene flow among fish populations.
Multimetric index: A composite ecological indicator combining multiple biological metrics to assess environmental status or anthropogenic impact.
Salinity gradient: The spatial variation in salt concentration, a key abiotic filter that structures fish assemblages in transitional waters.
Transitional water ecosystem: An aquatic environment lying between freshwater and marine realms, characterised by fluctuating salinity and dynamic habitat conditions.
References
- Fish Response to Multiple Anthropogenic Stressors in Mediterranean Coastal Lagoons: A Comparative Study of the Role of Different Management Strategies. Water (2021).
- Seasonal Variation of Functional Traits in the Fish Community in a Brackish Lagoon of the Po River Delta (Northern Italy). Water (2021).
- Influence of Seascape on Coastal Lagoon Fisheries: the Role of Habitat Mosaic in the Venice Lagoon. Estuaries and Coasts (2021).
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