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Effects of differential habitat warming on complex communities
Tyler D Tunney1, Kevin S McCann2, Nigel P Lester3
1Department of Integrative Biology, University of Guelph, Guelph, ON, Canada N1G 2W1; ttunney@gmail.com.
Summary
Climate warming alters lake food webs by shifting predator behavior towards cold-water habitats, increasing food chain length and threatening ecosystem sustainability.
Area of Science:
- Ecology
- Climate Change Biology
- Aquatic Ecosystems
Background:
- Ecosystems are structured by food webs connecting diverse habitats via mobile consumers responding to environmental conditions.
- Climate change research often overlooks differential habitat warming and consumer behavioral shifts impacting ecosystem energy pathways.
Purpose of the Study:
- To investigate how climate warming-induced temperature differentials affect lake food web structure and energy flow.
- To determine if mobile consumer behavior drives ecosystem-level responses to climate change.
Main Methods:
- Analyzed 54 lake food webs to observe structural shifts in response to rising air temperatures.
- Focused on the behavioral adjustments of cold-adapted predators to local temperature variations.
Main Results:
- Rising air temperatures led to a structural shift in lake food webs, increasing reliance on cold-water refuge habitats.
- Food chain length increased, driven by the behavioral responses of cold-adapted predators.
- These shifts occurred independently of changes in warmer-adapted species.
Conclusions:
- Mobile consumer behavior, particularly that of cold-adapted predators, significantly restructures lake food webs under climate warming.
- Altered trophic pathways can impact biomass accumulation and threaten aquatic ecosystem sustainability.
- Flexible food web architecture requires greater consideration in climate change impact assessments.