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Resource availability drives trait composition of butterfly assemblages.

Chensheng Zhang1,2, Josef Settele2,3,4, Wenhao Sun5

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Butterfly species traits reveal how they adapt to environmental changes. Net primary productivity and vegetation period significantly influence butterfly community structure, with specialists overwintering as eggs needing conservation focus.

Keywords:
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Area of Science:

  • Ecology
  • Environmental Science
  • Zoology

Background:

  • Understanding species' responses to environmental change is crucial in ecology.
  • Species traits offer insights into ecological community structure and function.
  • Elevational gradients provide natural experiments to study environmental impacts.

Purpose of the Study:

  • To analyze how functional traits of butterfly assemblages change along an elevational gradient.
  • To assess the impacts of temperature, net primary productivity (NDVI), and land use on butterfly communities.
  • To investigate environment-herbivore relationships using trait associations.

Main Methods:

  • Studied local butterfly communities in a Chinese nature reserve.
  • Analyzed species traits: body size, voltinism, overwintering stages, and host specificity.
  • Correlated trait data with environmental variables like temperature, NDVI, and vegetation period length.

Main Results:

  • Net primary productivity (NDVI) strongly influenced butterfly functional structure, particularly body size, favoring larger species.
  • Vegetation period length had a dominant effect, but increased generalists contradicted niche breadth hypotheses.
  • Species overwintering as eggs showed a decrease in abundance with longer vegetation periods.

Conclusions:

  • Trait associations effectively explain environment-herbivore relationships.
  • Resource availability significantly shapes the functional composition of herbivore assemblages.
  • Conservation efforts should prioritize specialist butterfly species overwintering as eggs, especially considering global warming.