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Temperature alters food web body-size structure.

Jean P Gibert1, John P DeLong2

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Climate change impacts marine food webs. Warmer temperatures alter predator-prey body size relationships, affecting ecosystem stability and interaction strengths.

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Area of Science:

  • Marine Ecology
  • Climate Change Biology
  • Food Web Dynamics

Background:

  • Rising global temperatures due to climate change can influence ecological interactions.
  • The specific effects of temperature on predator-prey body-size relationships and overall food web structure remain largely unknown.
  • Understanding these relationships is crucial for predicting ecosystem responses to warming.

Purpose of the Study:

  • To investigate how environmental temperature affects predator-prey body-size relationships across diverse marine habitats.
  • To analyze the largest available dataset on marine predator-prey interactions to date.
  • To assess the implications of temperature-driven changes for food web stability.

Main Methods:

  • Utilized a comprehensive dataset encompassing marine predator-prey interactions from tropical to polar regions.
  • Analyzed how predator body size, water temperature, and their interaction influence prey size selection.
  • Examined body-size ratios across a spectrum of predator sizes and temperature conditions.

Main Results:

  • Prey size selection is significantly influenced by predator body size and temperature.
  • Predator-prey body-size ratios decrease with predator size at lower temperatures but increase with predator size at higher temperatures.
  • Temperature's impact on body-size structure is most pronounced at small and large predator sizes, with weaker effects at intermediate sizes.

Conclusions:

  • Temperature systematically alters predator-prey body-size relationships in marine ecosystems.
  • These findings provide a framework for predicting how ocean warming may affect interaction strengths and food web stability.
  • The identified systematic interaction can simplify forecasting the complex consequences of climate change on marine food webs.