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DOI	10.1002/ece3.10937
	The thermal breadth of temperate and tropical freshwater insects supports the climate variability hypothesis
	Dewenter, Beatrice S.; Shah, Alisha A.; Hughes, Jane; Poff, N. LeRoy; Thompson, Ross; Kefford, Ben J.
发表日期	2024
ISSN	2045-7758
起始页码	14
结束页码	2
卷号	14 期号:2
英文摘要	Climate change involves increases in mean temperature and changes in temperature variability at multiple temporal scales but research rarely considers these temporal scales. The climate variability hypothesis (CVH) provides a conceptual framework for exploring the potential effects of annual scale thermal variability across climatic zones. The CVH predicts ectotherms in temperate regions tolerate a wider range of temperatures than those in tropical regions in response to greater annual variability in temperate regions. However, various other aspects of thermal regimes (e.g. diel variability), organisms' size and taxonomic identity are also hypothesised to influence thermal tolerance. Indeed, high temperatures in the tropics have been proposed as constraining organisms' ability to tolerate a wide range of temperatures, implying that high annual maximum temperatures would be associated with tolerating a narrow range of temperatures. We measured thermal regimes and critical thermal limits (CTmax and CTmin) of freshwater insects in the orders Ephemeroptera (mayflies), Plecoptera (stoneflies) and Trichoptera (caddisflies) along elevation gradients in streams in temperate and tropical regions of eastern Australia and tested the CVH by determining which variables were most correlated with thermal breadth (T-br = CTmax - CTmin). Consistent with the CVH, T-br tended to increase with increasing annual temperature range. T-br also increased with body size and T-br was generally wider in Plecoptera than in Ephemeroptera or Trichoptera. We also find some support for a related hypothesis, the climate extreme hypothesis (CEH), particularly for predicting upper thermal limits. We found no evidence that higher annual maximum temperature constrained individuals' abilities to tolerate a wide range of temperatures. The support for the CVH we document suggests that temperate organisms may be able to tolerate wider ranges of temperatures than tropical organisms. There is an urgent need to investigate other aspects of thermal regimes, such as diel temperature cycling and minimum temperature.
英文关键词	aquatic ectotherms; climate change; climate variability hypothesis; CTmax; CTmin; temperature variability; thermal breadth; thermal tolerance
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Evolutionary Biology
WOS类目	Ecology ; Evolutionary Biology
WOS记录号	WOS:001174810200001
来源期刊	ECOLOGY AND EVOLUTION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290826
作者单位	University of Canberra; Michigan State University; Griffith University; Colorado State University
推荐引用方式 GB/T 7714	Dewenter, Beatrice S.,Shah, Alisha A.,Hughes, Jane,et al. The thermal breadth of temperate and tropical freshwater insects supports the climate variability hypothesis[J],2024,14(2).
APA	Dewenter, Beatrice S.,Shah, Alisha A.,Hughes, Jane,Poff, N. LeRoy,Thompson, Ross,&Kefford, Ben J..(2024).The thermal breadth of temperate and tropical freshwater insects supports the climate variability hypothesis.ECOLOGY AND EVOLUTION,14(2).
MLA	Dewenter, Beatrice S.,et al."The thermal breadth of temperate and tropical freshwater insects supports the climate variability hypothesis".ECOLOGY AND EVOLUTION 14.2(2024).