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Interactive effects of experimental heating rates, ontogeny and body mass on the upper thermal limits of anuran larvae

Texto completo
Agudelo-Cantero, Gustavo A. [1] ; Navas, Carlos A. [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biosci, Grad Sch Program Gen Physiol, Rua Matao 101, Travessa 14, BR-05508090 Sao Paulo - Brazil
[2] Univ Sao Paulo, Inst Biosci, Dept Physiol, Rua Matao 101, Travessa 14, BR-05508090 Sao Paulo - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Thermal Biology; v. 82, p. 43-51, MAY 2019.
Citações Web of Science: 0

Biological and methodological factors influence the upper thermal limits (UTL) of ectothermic animals, but most factors have been studied independently. Few studies have integrated variables, so our understanding about sources of UTL variation remains fragmentary. Thereby, we investigated synergic effects of experimental protocols (heating rates, Delta Ts) and biological factors (ontogeny and body mass) on the UTL on the larvae of two anuran species (Physalaemus nattereri and Boana pardalis), specifically their Critical Thermal Maximum (CTmax). The species displayed slightly different responses to Delta Ts: In B. pardalis tadpoles both average and variance of CTmax increased at a fastest Delta T, the same response happened in P. nattereri tadpoles at slow and moderate Delta Ts. Also, the CTmax of P. nattereri declined at the end of metamorphosis independently of Delta T, but tadpoles at all developmental stages still displayed higher heat tolerance at the slow Delta T. Finally, we detected small, synergic effects of body mass and Delta Ts on the CTmax of both species. In small B. pardalis tadpoles and premetamorphic P. nattereri tadpoles, body mass had a positive effect on CTmax but only at slow and moderate Delta Ts, probably indicating physiological responses. A similar trend was observed in large B. pardalis tadpoles at the fast Delta T, but this result is likely to be influenced by thermal inertia. Our findings contribute to integrate the understanding of factors influencing UTL in small ectothermic animals. This understanding is critical to discuss the physiological component of vulnerability to climate change that is related to acute temperatures. (AU)

Processo FAPESP: 14/16320-7 - Impactos das mudanças climáticas e ambientais sobre a fauna: uma abordagem integrativa
Beneficiário:Carlos Arturo Navas Iannini
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático