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Resurrection of Dormant Daphnia magna: Protocol and Applications
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Multi-scale responses to warming in an experimental insect metacommunity.

Tess Nahanni Grainger1, Benjamin Gilbert1

  • 1Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada.

Global Change Biology
|May 31, 2017
PubMed
Summary

Warming benefited insect communities locally but increased dispersal risks, interacting with habitat connectivity to affect overall diversity. Understanding these combined effects is crucial for predicting climate change impacts on ecosystems.

Keywords:
climate changeconnectivitydispersalherbivorymilkweedspecies interactionswarming

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Metacommunity Dynamics

Background:

  • Metacommunity diversity arises from local interactions and regional dispersal.
  • Climate warming can influence both species interactions and dispersal, but their combined effects are unclear.
  • Understanding these combined effects is vital for predicting ecosystem responses to climate change.

Purpose of the Study:

  • To investigate the independent and interactive effects of warming on local species interactions and dispersal in experimental metacommunities.
  • To test predictions based on metabolic theory regarding warming's impact on resource use, insect populations, and dispersal.

Main Methods:

  • Constructed experimental milkweed-based metacommunities with five specialist insect species.
  • Applied two warming levels (unwarmed, warmed) and three connectivity levels (isolated, low, high).
  • Monitored insect populations, local interactions, and dispersal success under different treatments.

Main Results:

  • Warming generally improved local insect performance and did not significantly alter resource drawdown or insect-insect associations.
  • Dispersal across the habitat matrix presented species-specific risks, causing declines in some species.
  • An interaction between warming and connectivity was observed, with the most rapid diversity declines in unwarmed, poorly connected metacommunities.

Conclusions:

  • Warming's effects on metacommunities are complex, often favoring local populations but potentially increasing extinction risks through dispersal.
  • Habitat connectivity significantly modulates the impact of warming on community diversity.
  • Integrating local interactions and spatial structure is essential for accurate predictions of climate change effects on biodiversity.