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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
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Experimental whole-stream warming alters community size structure.

Daniel Nelson1, Jonathan P Benstead1, Alexander D Huryn1

  • 1Department of Biological Sciences, University of Alabama, Tuscaloosa, AL, 35487 USA.

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Global warming impacts biodiversity by altering invertebrate communities. A whole-stream warming experiment showed shifts in species composition and size, demonstrating how temperature changes ecosystem functioning.

Keywords:
body sizecommunity structureenergy demandmetabolic theorystream warmingthermal preference

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Freshwater Ecology

Background:

  • Ecological communities face predicted temperature increases, impacting biodiversity and ecosystem functioning.
  • Understanding these responses requires large-scale habitat manipulations open to dispersal.

Purpose of the Study:

  • To investigate the effects of whole-stream warming on invertebrate assemblage structure.
  • To test how warming influences community-level metabolic theory and species composition.

Main Methods:

  • A two-year whole-stream warming experiment was conducted, increasing temperatures by 3.8°C.
  • Invertebrate abundance, biomass, and assemblage structure were compared between experimental and reference streams.
  • Changes in taxa, body size, and community size spectra were analyzed.

Main Results:

  • Warming decreased invertebrate abundance by 60% but did not change total biomass.
  • Assemblage structure shifted due to the arrival of new, warm-adapted taxa (snails, predatory dipterans) and a decrease in cold-adapted taxa (chironomids, oligochaetes).
  • Warming increased community-level energy demand, potentially met by increased primary production.

Conclusions:

  • Warming reassembles ecological communities through species exchange, influenced by thermal traits and regional species pools.
  • These findings highlight how anthropogenic warming can alter biodiversity and ecosystem function across various communities.
  • Community responses are constrained by energy supply and regional species availability.