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Warming and resource availability shift food web structure and metabolism.

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Marine Ecology

Background:

  • Climate change significantly disrupts ecological systems.
  • Species-specific responses to warming make general predictions challenging.
  • Temperature-dependent metabolic effects across trophic levels suggest predictable food web shifts.

Purpose of the Study:

  • To experimentally test the effects of warming on food web structure and productivity.
  • To investigate how resource supply influences warming's impact on food webs.

Main Methods:

  • Experimental manipulation of temperature in a marine food web.
  • Varying resource supply levels (augmented vs. lower).
  • Analysis of food web structure, primary production, and total biomass.

Main Results:

  • Warming strengthened consumer control of primary production under augmented resource conditions.
  • Warming shifted food web structure and reduced total biomass, despite increased primary productivity.
  • At lower resource levels, food web production was constrained across all temperatures.

Conclusions:

  • Warming can dramatically alter food web dynamics through species-independent mechanisms.
  • Metabolic scaling provides a general framework for predicting ecological responses to temperature change.
  • Resource availability modulates the impact of warming on food web stability and productivity.