Isolating weather effects from seasonal activity patterns of a temperate North American Colubrid

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• 作者：Andrew D. George ; Frank R. Thompson III ; John Faaborg
• 关键词：Climate change ; Elaphe obsoleta ; Pantherophis obsoletus ; Thermal ecology ; Western ratsnakes
• 刊名：Oecologia
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：178
• 期：4
• 页码：1251-1259
• 全文大小：501 KB
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• 作者单位：Andrew D. George (1)
  Frank R. Thompson III (2)
  John Faaborg (1)
  
  1. Division of Biological Sciences, University of Missouri, 105 Tucker Hall, Columbia, MO, 65211, USA
  2. U.S.D.A. Forest Service Northern Research Station, University of Missouri, 202 ABNR, Columbia, MO, 65211, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Plant Sciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1939

文摘

Forecasting the effects of climate change on threatened ecosystems and species will require an understanding of how weather influences processes that drive population dynamics. We have evaluated weather effects on activity patterns of western ratsnakes, a widespread predator of birds and small mammals in eastern North America. From 2010-013 we radio-tracked 53 ratsnakes in the fragmented region of central Missouri. We relocated each snake 4× per week and used movement frequency as an index of activity. We used generalized linear mixed models within an information–theoretic approach to evaluate temporal and weather variables as potential predictors of snake activity. While snakes were generally sedentary, activity showed a linear response to relative humidity and a quadratic response to air temperature, peaking near 30 °C. Seasonal activity patterns differed between sexes and among years, but snakes were generally least active in mid-summer, regardless of weather. Our findings provide strong evidence that air temperature and relative humidity differentially affect activity patterns of an important predator and are the mechanism explaining increased nest predation rates with warmer temperatures.