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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Intraspecific variation in lizard heat tolerance alters estimates of climate impact
Journal of Animal Ecology, Volume 88, No. 2, Year 2019
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Description
Research addressing the effects of global warming on the distribution and persistence of species generally assumes that population variation in thermal tolerance is spatially constant or overridden by interspecific variation. Typically, this rationale is implicit in sourcing one critical thermal maximum (CT max ) population estimate per species to model spatiotemporal cross-taxa variation in heat tolerance. Theory suggests that such an approach could result in biased or imprecise estimates and forecasts of impact from climate warming, but limited empirical evidence in support of those expectations exists. We experimentally quantify the magnitude of intraspecific variation in CT max among lizard populations, and the extent to which incorporating such variability can alter estimates of climate impact through a biophysical model. To do so, we measured CT max from 59 populations of 15 Iberian lizard species (304 individuals). The overall median CT max across all individuals from all species was 42.8°C and ranged from 40.5 to 48.3°C, with species medians decreasing through xeric, climate-generalist and mesic taxa. We found strong statistical support for intraspecific differentiation in CT max by up to a median of 3°C among populations. We show that annual restricted activity (operative temperature > CT max ) over the Iberian distribution of our study species differs by a median of >80 hr per 25-km 2 grid cell based on different population-level CT max estimates. This discrepancy leads to predictions of spatial variation in annual restricted activity to change by more than 20 days for six of the study species. Considering that during restriction periods, reptiles should be unable to feed and reproduce, current projections of climate-change impacts on the fitness of ectotherm fauna could be under- or over-estimated depending on which population is chosen to represent the physiological spectra of the species in question. Mapping heat tolerance over the full geographical ranges of single species is thus critical to address cross-taxa patterns and drivers of heat tolerance in a biologically comprehensive way. © 2018 The Authors. Journal of Animal Ecology © 2018 British Ecological Society
Authors & Co-Authors
Herrando-Pérez, Salvador
Australia, Adelaide
The University of Adelaide
Spain, Madrid
Consejo Superior de Investigaciones Científicas
Ferri-Yáñez, Francisco
Spain, Madrid
Consejo Superior de Investigaciones Científicas
Monasterio, Camila
Spain, Madrid
Consejo Superior de Investigaciones Científicas
Beukema, Wouter
Belgium, Ghent
Universiteit Gent
Belliure, Josabel
Spain, Alcala de Henares
Universidad de Alcalá
Chown, Steven L.
Australia, Clayton
Monash University
Vieites, David Rodriguez
Spain, Madrid
Consejo Superior de Investigaciones Científicas
Araújo, Miguel B.
Spain, Madrid
Consejo Superior de Investigaciones Científicas
Portugal, Evora
University of Évora
Denmark, Copenhagen
Københavns Universitet
Statistics
Citations: 48
Authors: 8
Affiliations: 8
Identifiers
Doi:
10.1111/1365-2656.12914
ISSN:
00218790
Study Design
Cross Sectional Study