4.8 Article

Resource limitation determines realized thermal performance of consumers in trophodynamic models

Journal

ECOLOGY LETTERS
Volume 25, Issue 10, Pages 2142-2155

Publisher

WILEY
DOI: 10.1111/ele.14086

Keywords

consumer-resource model; metabolic meltdown; resource limitation; thermal performance

Categories

Funding

  1. NSF PRFB [2010783]
  2. Yale University
  3. University of Oxford
  4. NSF DEB [1754012, 1856279]
  5. Direct For Biological Sciences
  6. Div Of Biological Infrastructure [2010783] Funding Source: National Science Foundation
  7. Division Of Environmental Biology
  8. Direct For Biological Sciences [1856279, 1754012] Funding Source: National Science Foundation

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Recent research has shown that changes in resource availability can impact a consumer's thermal performance curve. When resources decline, the optimal temperature and breadth of thermal performance also decrease, increasing the risk of warming. This study investigates how temperature affects consumer-resource dynamics and the potential for changes in the consumer's thermal performance curve to alter extinction risk.
Recent work has demonstrated that changes in resource availability can alter a consumer's thermal performance curve (TPC). When resources decline, the optimal temperature and breadth of thermal performance also decline, leading to a greater risk of warming than predicted by static TPCs. We investigate the effect of temperature on coupled consumer-resource dynamics, focusing on the potential for changes in the consumer TPC to alter extinction risk. Coupling consumer and resource dynamics generally reduces the potential for resource decline to exacerbate the effects of warming via changes to the TPC due to a reduction in top-down control when consumers near the limits of their thermal performance curve. However, if resources are more sensitive to warming, consumer TPCs can be reshaped by declining resources, leading to increased extinction risk. Our work elucidates the role of top-down and bottom-up regulation in determining the extent to which changes in resource density alter consumer TPCs.

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