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Interaction of behavior and physiology of anurans in response to thermal and water stress: an approach to understand the vulnerability of anurans to climate change

Grant number: 17/14382-3
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): November 01, 2017
Effective date (End): April 30, 2019
Field of knowledge:Biological Sciences - Physiology - General Physiology
Principal Investigator:Fernando Ribeiro Gomes
Grantee:Estefany Caroline Guevara Molina
Host Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):18/04534-3 - Interaction of dehydration and thermal tolerance in egg masses of the red-eyed treefrog Agalychnis callidryas (Anura: Hylidae), BE.EP.MS


Global warming has a direct impact on the distribution and abundance of organisms, such as anurans, a group particularly vulnerable to high temperatures due to its ectothermic condition and high rates of body water loss. To understand the effects of climate change on anurans, it is necessary to integrate their tolerance to different stressful climatic conditions (eg high temperatures and low water availability), with behavioral mechanisms that they use to cope with these conditions and to understand how different levels of climatic stresses determine the survival time of individuals. Thermal tolerance indices have been widely used to assess tolerance to high temperatures in anurans. These indices are: Preferential Temperature (Tp), Maximum Voluntary Temperature (TVM) and Critical Temperature Maximum (CTMax). However, it is still not well understood how these indices affect anurans when exposed to thermal and water stress and how long these animals can withstand stressful water and thermal conditions. The present work will evaluate if the descriptors of thermal tolerance and time to loss of locomotor function in anurans are negatively affected by their level of hydration. For this, we will use individuals of Bullfrog (Lithobates catesbeianus), an invasive frog in Brazil and that can be easily obtained commercially. Individuals will be kept in individual terrariums and for each individual measurements of different thermal tolerance indices will be performed (Tp, TVM, CTMax) at different levels of hydration (100%, 90%, 80% relative to body weight). Subsequently, we will measure the time of loss of the locomotor function of individuals exposed to DVT with different levels of hydration (100%, 90%, 80%). We hope that our results will allow us to understand how thermal tolerance and thermoregulatory behavior of anurans are affected by their level of hydration, as well as the thermal and water stress exposure times that these animals can withstand. This information is needed to improve the application of thermal tolerance in models of potential distribution of anurans populations in the current and future climate. Our study is particularly important to subsidize the application of thermal tolerance in distribution models of this invasive frog, with potential negative effects on Brazilian anurans. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GUEVARA-MOLINA, ESTEFANY CAROLINE; GOMES, FERNANDO RIBEIRO; CAMACHO, AGUSTIN. Effects of dehydration on thermoregulatory behavior and thermal tolerance limits of Rana catesbeiana (Shaw, 1802). Journal of Thermal Biology, v. 93, . (14/16320-7, 17/14382-3)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
MOLINA, Estefany Caroline Guevara. Interaction of behavior and physiology of anurans in response to thermal and hydric stress: an approach to understand the vulnerability of anurans to climate change. 2019. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) São Paulo.

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