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Population effects of increased climate variation.

John M Drake1

  • 1National Center for Ecological Analysis and Synthesis, 735 State Street, Suite 300, Santa Barbara, CA 93101, USA. drake@nceas.ucsb.edu

Proceedings. Biological Sciences
|August 13, 2005
PubMed
Summary

Climate change alters environmental variability. Increased temperature fluctuations may boost zooplankton population growth rates and extreme demographic events, contrary to rainfall pattern effects.

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Area of Science:

  • Ecology
  • Climate Science
  • Population Dynamics

Background:

  • Anthropogenic climate change is altering high-frequency climate variability.
  • The impact of changing environmental variation on wildlife population dynamics is not fully understood.
  • Theory suggests increased environmental variation typically diminishes population growth rates and increases extinction risk.

Purpose of the Study:

  • To investigate the effect of fluctuating temperatures on zooplankton growth rates.
  • To test the hypothesis that increasing temperature variation can increase long-run population growth rates.

Main Methods:

  • Analysis of two datasets on zooplankton populations.
  • Examining the relationship between temperature variability and population growth rates.

Main Results:

  • Results align with the prediction that fluctuating temperatures increase long-run zooplankton growth rates.
  • Increased temperature variability was associated with a higher frequency of extreme demographic events.

Conclusions:

  • Fluctuating temperatures, unlike rainfall variability, may enhance population growth rates for certain species.
  • Understanding these differential effects is crucial for predicting ecological consequences of climate change.

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