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Related Experiment Video

Updated: Apr 9, 2026

Necropsy-based Wild Fish Health Assessment
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Long-term functional changes in an estuarine fish assemblage.

J Baptista1, F Martinho1, D Nyitrai1

  • 1CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal.

Marine Pollution Bulletin
|June 22, 2015
PubMed
Summary
This summary is machine-generated.

Fish communities in the Mondego estuary shifted significantly over 30 years due to hydrological changes. Species richness declined, with a transition from pelagic to demersal fish, indicating ecosystem adaptation and potential climate change impacts.

Keywords:
Climate changeEstuariesFish assemblagesHydrologyTraits

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Area of Science:

  • * Ecological studies
  • * Ichthyology
  • * Environmental science

Background:

  • * The Mondego estuary's fish assemblages were analyzed over a 30-year period (1988-2012).
  • * Significant hydrological alterations occurred, driven by human activities and extreme weather events.
  • * These changes impacted the fish community's structure and function.

Purpose of the Study:

  • * To assess the functional diversity of fish assemblages in the Mondego estuary.
  • * To understand how hydrological changes affect fish community structure and function.
  • * To identify long-term trends in fish populations and their ecological roles.

Main Methods:

  • * Analysis of fish assemblage data spanning 1988-2012.
  • * Correlation of fish community changes with hydrological data.
  • * Assessment of species richness, functional richness, and trophic/habitat/salinity preferences.

Main Results:

  • * Decreased species richness and functional richness over the study period.
  • * Shift in community dominance from pelagic, detritivorous species to demersal, benthic, piscivorous, and marine species.
  • * Increased importance of omnivorous species during drought and a rise in subtropical species, potentially linked to global warming.

Conclusions:

  • * Hydrological changes profoundly altered the Mondego estuary's fish community structure and function.
  • * Estuaries play a crucial role in restocking commercial fish species.
  • * Observed shifts suggest adaptation to environmental changes and potential impacts of climate change.