globalchange  > 气候变化与战略
DOI: 10.1111/1365-2435.13507
论文题名:
Heat tolerance is more variable than cold tolerance across species of Iberian lizards after controlling for intraspecific variation
作者: Herrando-Pérez S.; Monasterio C.; Beukema W.; Gomes V.; Ferri-Yáñez F.; Vieites D.R.; Buckley L.B.; Araújo M.B.
刊名: Functional Ecology
ISSN: 2698463
出版年: 2020
卷: 34, 期:3
语种: 英语
英文关键词: climate change ; CTmax ; CTmin ; ecophysiology ; ectotherm ; macroecology ; plasticity ; resampling
Scopus关键词: Squamata
英文摘要: The widespread observation that heat tolerance is less variable than cold tolerance (‘cold-tolerance asymmetry’) leads to the prediction that species exposed to temperatures near their thermal maxima should have reduced evolutionary potential for adapting to climate warming. However, the prediction is largely supported by species-level global studies based on single estimates of both physiological metrics per taxon. We ask whether cold-tolerance asymmetry holds for Iberian lizards after accounting for intraspecific variation in critical thermal maxima (CTmax) and minima (CTmin). To do so, we quantified CTmax and CTmin for 58 populations of 15 Iberian lizard species (299 individuals). Then, we randomly selected one population from each study species (population sample = 15 CTmax and CTmin values), tested for differences between the variance of both thermal metrics across species, and repeated the test for thousands of population samples as if we had undertaken the same study thousands of times, each time sampling one different population per species (as implemented in global studies). The ratio of variances in CTmax to CTmin across species varied up to 16-fold depending on the populations chosen. Variance ratios show how much CTmax departs from the cross-species mean compared to CTmin, with a unitary ratio indicating equal variance of both thermal limits. Sampling one population per species was six times more likely to result in the observation of greater CTmax variance (‘heat-tolerance asymmetry’) than cold-tolerance asymmetry. The probability of obtaining the data (given the null hypothesis of equal variance being true) was twice as likely for cases of cold-tolerance asymmetry than for the opposite scenario. Range-wide, population-level studies that quantify heat and cold tolerance of individual species are urgently needed to ascertain the global prevalence of cold-tolerance asymmetry. While broad latitudinal clines of cold tolerance have been strongly supported, heat tolerance might respond to smaller-scale climatic and habitat factors hence go unnoticed in global studies. Studies investigating physiological responses to climate change should incorporate the extent to which thermal traits are characteristic of individuals, populations and/or species. A free Plain Language Summary can be found within the Supporting Information of this article. © 2019 British Ecological Society
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158961
Appears in Collections:气候变化与战略

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作者单位: Australian Centre for Ancient DNA, School of Biological Sciences, The University of Adelaide, Adelaide, SA, Australia; Department of Biogeography and Global Change, Museo Nacional de Ciencias Naturales, Spanish National Research Council (CSIC), Madrid, Spain; Wildlife Health Ghent, Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium; Research Center in Biodiversity and Genetic Resources (CIBIO), Research Network in Biodiversity and Evolutionary Biology (lnBIO), Universidade do Porto, Vairão, Portugal; Department of Community Ecology, Helmholtz Centre for Environmental Research (UFZ), Halle (Saale), Germany; Department of Biology, University of Washington, Seattle, WA, United States; Rui Nabeiro Biodiversity Chair, MED Institute, Universidade de Évora, Largo dos Colegiais, Évora, Portugal; The Globe Institute, University of Copenhagen, Copenhagen, Denmark

Recommended Citation:
Herrando-Pérez S.,Monasterio C.,Beukema W.,et al. Heat tolerance is more variable than cold tolerance across species of Iberian lizards after controlling for intraspecific variation[J]. Functional Ecology,2020-01-01,34(3)
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