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Shift in a large river fish assemblage: body-size and trophic structure dynamics.

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Ecological efficiency in the Wabash River fish community increased following a shift from planktivore-omnivores to benthic invertivores. This shift in functional feeding groups indicates a compensatory response within the food web.

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Area of Science:

  • Ecology
  • Aquatic Ecology
  • Fisheries Science

Background:

  • Environmental changes necessitate understanding ecological impacts on communities.
  • Food web alterations and their ecological implications are less understood than community change drivers.
  • Fish assemblage dynamics are crucial indicators of aquatic ecosystem health.

Purpose of the Study:

  • To evaluate temporal variations in fish body-size structure and functional group composition in the Wabash River.
  • To assess changes in ecological efficiency and food web capacity over time.
  • To understand the ecological implications of fish assemblage shifts.

Main Methods:

  • Analysis of Wabash River fish assemblage data from 1974-2008.
  • Utilized community size-spectra to derive regression slope (ecological efficiency) and spectral elevation (food web capacity).
  • Examined changes in abundance and functional feeding group composition over two time periods.

Main Results:

  • A significant fish assemblage shift occurred over a seven-year period.
  • The dominant functional feeding groups changed from planktivore-omnivores to benthic invertivores.
  • Ecological efficiency, indicated by increased regression slopes, rose concurrently with an increase in large-bodied, low trophic level fish.
  • Food web capacity remained stable, showing no clear temporal trends.

Conclusions:

  • Increased ecological efficiency was observed following the fish assemblage shift.
  • A compensatory response shifted biomass among functional feeding groups, maintaining overall food web capacity.
  • The study highlights the dynamic nature of fish communities and their response to environmental changes.