Publication: Climatic stability, not average habitat temperature, determines thermal tolerance of subterranean beetles
Authors
Colado Manero, Raquel ; Pallares Párraga, S. ; Fresneda, J. ; Mammola, S. ; Rizzo, V. ; Sánchez Fernández, David
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DOI
DOI: 10.1002/ecy.3629
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info:eu-repo/semantics/article
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© 2021 Ecological Society of America. This manuscript version is made available under the CC-BY-4.0 license http://creativecommons.org/licenses/by/4.0/ This document is the Published Manuscript version of a Published Work that appeared in final form in Ecology. To access the final edited and published work see DOI: 10.1002/ecy.3629
© 2021 Ecological Society of America. This manuscript version is made available under the CC-BY-4.0 license http://creativecommons.org/licenses/by/4.0/ This document is the Published Manuscript version of a Published Work that appeared in final form in Ecology. To access the final edited and published work see DOI: 10.1002/ecy.3629
Abstract
The climatic variability hypothesis predicts the evolution of species with wide thermal tolerance ranges in environments with variable temperatures, and the
evolution of thermal specialists in thermally stable environments. In caves, the extent of spatial and temporal thermal variability experienced by taxa
decreases with their degree of specialization to deep subterranean habitats. We use phylogenetic generalized least squares to model the relationship among
thermal tolerance (upper lethal limits), subterranean specialization (estimated using ecomorphological traits), and habitat temperature in 16 beetle species of
the tribe Leptodirini (Leiodidae). We found a significant, negative relationship between thermal tolerance and the degree of subterranean specialization. Conversely, habitat temperature had only a marginal effect on lethal limits. In agreement with the climatic variability hypothesis and under a climate change
context, we show that the specialization process to live in deep subterranean habitats involves a reduction of upper lethal limits, but not an adjustment to
habitat temperature. Thermal variability seems to exert a higher evolutionary pressure than mean habitat temperature to configure the thermal niche of subterranean species. Our results provide novel insights on thermal physiology of species with poor dispersal capabilities and on the evolutionary process of
adaptation to subterranean environments. We further emphasize that the pathways determining vulnerability of subterranean species to climate change
greatly depend on the degree of specialization to deep subterranean environments.
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Ecology
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