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Extreme Insolation: Climatic Variation Shapes the Evolution of Thermal Tolerance at Multiple Scales
Journal article   Peer reviewed

Extreme Insolation: Climatic Variation Shapes the Evolution of Thermal Tolerance at Multiple Scales

Kaitlin M. Baudier, Catherine L. D'Amelio, Rumaan Malhotra, Michael P. O'Connor and Sean O'Donnell
The American naturalist, v 192(3), pp 347-359
01 Sep 2018
PMID: 30125235

Abstract

Ecology Environmental Sciences & Ecology Evolutionary Biology Life Sciences & Biomedicine Science & Technology
The climatic variability hypothesis (CVH) is a cornerstone of thermal ecology, predicting the evolution of wider organismal thermal tolerance ranges in more thermally variable environments. Thermal tolerance ranges depend on both upper and lower tolerance limits (critical thermal maxima [CTmax?] and critical thermal minima [CTmin?]), which may show different responses to environmental gradients. To delineate the relative effects of mean and extreme temperatures on thermal tolerances, we conducted a within-latitude comparative test of CVH predictions for army ants (Dorylinae) at multiple scales: across elevations, in seasonal versus aseasonal forests, and in subterranean versus surface microhabitats. Consistent with the CVH, thermally buffered subterranean species had narrower thermal tolerance ranges. Both CTmin? and CTmax? decreased with elevation for subterranean species. In contrast, aboveground species (those exposed to insolation) showed a decrease in CTmin? but no change in CTmax? across elevations. Furthermore, greater seasonal temperature variation in dry forests correlated with increased CTmax? but not CTmin?. These patterns suggest that CTmax? and CTmin? respond to different abiotic selective forces: habitat-specific exposure to extreme insolation corresponds to CTmax? differences but not to CTmin? variation. We predict that increasingly frequent heat spikes associated with climate change will have habitat-specific physiological consequences for ectothermic animals. Models predicting climate change impacts should account for species microhabitat uses and within-latitude differences in temperature seasonality.

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Collaboration types
Domestic collaboration
Web of Science research areas
Ecology
Evolutionary Biology
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