Trading heat and hops for water: Dehydration effects on locomotor performance, thermal limits, and thermoregulatory behavior of a terrestrial toad

Autor(es)

Anderson, Rodolfo C. O. ^[1] ; Andrade, Denis V. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Inst Biociencias, Dept Zool, Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOLOGY AND EVOLUTION; v. 7, n. 21, p. 9066-9075, NOV 2017.
• Citações Web of Science: 11

Resumo

Due to their highly permeable skin and ectothermy, terrestrial amphibians are challenged by compromises between water balance and body temperature regulation. The way in which such compromises are accommodated, under a range of temperatures and dehydration levels, impacts importantly the behavior and ecology of amphibians. Thus, using the terrestrial toad Rhinella schneideri as a model organism, the goals of this study were twofold. First, we determined how the thermal sensitivity of a centrally relevant trait-locomotion-was affected by dehydration. Secondly, we examined the effects of the same levels of dehydration on thermal preference and thermal tolerance. As dehydration becomes more severe, the optimal temperature for locomotor performance was lowered and performance breadth narrower. Similarly, dehydration was accompanied by a decrease in the thermal tolerance range. Such a decrease was caused by both an increase in the critical minimal temperature and a decrease in the thermal maximal temperature, with the latter changing more markedly. In general, our results show that the negative effects of dehydration on behavioral performance and thermal tolerance are, at least partially, counteracted by concurrent adjustments in thermal preference. We discuss some of the potential implications of this observation for the conservation of anuran amphibians. (AU)

• Processo FAPESP: 13/04190-9 - Fisiologia termal e balanço de água em anfíbios anuros ao longo de um gradiente altitudinal da Floresta Atlântica
• Beneficiário: Denis Otavio Vieira de Andrade
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/13005-1 - "Negociando calor e saltos: efeitos da desidratação sobre o desempenho locomotor, limites termais e comportamento termorregulatório de um sapo terrestre"
• Beneficiário: Denis Otavio Vieira de Andrade
• Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Artigo