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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Upper thermal tolerance plasticity in tropical amphibian species from contrasting habitats: Implications for warming impact prediction

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Simon, Monique Nouailhetas [1] ; Ribeiro, Pedro Leite [1] ; Navas, Carlos Arturo [1]
Total Authors: 3
[1] Univ Sao Paulo, Inst Biosci, Dept Physiol, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Thermal Biology; v. 48, p. 36-44, FEB 2015.
Web of Science Citations: 20

Tropical ectothermic species are currently depicted as more vulnerable to increasing temperatures because of the proximity between their upper thermal limits and environmental temperatures. Yet, the acclimatory capacity of thermal limits has rarely been measured in tropical species, even though they are generally predicted to be smaller than in temperate species. We compared critical thermal maximum (CTmax) and warming tolerance (WT: the difference between CTmax and maximum temperature, T-max), as well as CTmax acclimatory capacity of toad species from the Atlantic forest (AF) and the Brazilian Caatinga (CAA), a semi-arid habitat with high temperatures. Acclimation temperatures represented the mean temperatures of AF and CAA habitats, making estimates of CTmax and WT more ecologically realistic. CAA species mean CTmax was higher compared to AF species in both acclimation treatments. Clutches within species, as well as between AF and CAA species, differed in CTmax plasticity and we discuss the potential biological meaning of these findings. We did not find a trade-off between absolute CTmax and CTmax plasticity, indicating that species can have both high CTmax and high CTmax a plasticity. Although CTmax was highly correlated to T-max, CTmax plasticity was not related to T-max or T-max coefficients of variation. CAA species mean WT was lower than for AF species, but still very high for all species, diverging from other studies with tropical species. This might be partially related to over-estimation of vulnerability due to under-appreciation of realistic acclimation treatments in CTmax estimation. Thus, some tropical species might not be as vulnerable to warming as previously predicted if CTmax is considered as a shifting population parameter. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 08/57687-0 - Effects of global climate change of the Brazilian fauna: a conservation physiology approach
Grantee:Carlos Arturo Navas Iannini
Support type: Research Program on Global Climate Change - Thematic Grants