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Thermal physiology and water balance in anurans along an altitudinal gradient in the Atlantic Rainforest

Abstract

Anurans can be regarded as model organisms for the study of thermal physiology and water balance due to their highly permeable skin (which makes them particularly sensitive to water availability in the environment) and ectothermy (which makes them dependent of external heat sources for body temperature regulation). Thus, temperature and water availability are known to exert a strong influence on the ecology, physiology, morphology, and behavior of anuran amphibians and can vary substantially along an ecological gradient. The present study aim to test whether intraspecific variations in physiological and/or molecular parameters can be associated to an altitudinal gradient in the Atlantic Rainforest. First, we will evaluate basic parameters related to thermal biology (critical thermal minimum and maximum) and water balance (evaporative water loss, skin resistance to evaporation, rates of rehydration from free water) of selected species found at low and high areas. Concurrently, for the same species and localities, we will study the levels of aquaporins (AQP) and heat shock proteins (HSP) expression. AQPs are proteins that form channels at the cell membrane, altering cell permeability several folds. HSPs are chaperones functioning during conformational changes of other proteins, under situations of thermal stress. Therefore, the core goal of the present study is trying to understand whether variation in physical (climate) characteristics along an altitudinal gradient are reflected in organismal physiological responses and/or at the molecular level. These two approaches are, however, independent and relevant in their own merit. Nonetheless, the verification of a possible congruency, or not, between these two levels of biological organization can disclose some of the factors possibly involved in an ecologically based variation. (AU)

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Scientific publications (12)
(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)
CLEMENTE, AMANDA C.; SENZANO, LUIS M.; GAVIRA, RODRIGO S. B.; ANDRADE, V, DENIS. Feeding alters the preferred body temperature of Cururu toads, Rhinella diptycha (Anura, Bufonidae). COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY, v. 249, NOV 2020. Web of Science Citations: 0.
TIMPONE, LUA T.; GAVIRA, RODRIGO S. B.; ANDRADE, V, DENIS. Effects of temperature and meal size on the postprandial metabolic response of Leptodactylus latrans (Anura, Leptodactylidae). JOURNAL OF EXPERIMENTAL ZOOLOGY PART A-ECOLOGICAL AND INTEGRATIVE PHYSIOLOGY, OCT 2019. Web of Science Citations: 0.
FABRICIO-NETO, AILTON; BUENO GAVIRA, RODRIGO SAMUEL; ANDRADE, DENIS VIEIRA. Thermal regime effects on the resting metabolic rate of rattlesnakes depend on temperature range. Journal of Thermal Biology, v. 83, p. 199-205, JUL 2019. Web of Science Citations: 1.
GOUVEIA, SIDNEY F.; BOVO, RAFAEL P.; RUBALCABA, JUAN G.; DA SILVA, FERNANDO RODRIGUES; MACIEL, NATAN M.; ANDRADE, DENIS V.; MARTINEZ, PABLO ARIEL. Biophysical Modeling of Water Economy Can Explain Geographic Gradient of Body Size in Anurans. American Naturalist, v. 193, n. 1, p. 51-58, JAN 1 2019. Web of Science Citations: 6.
SENZANO, LUIS MIGUEL; ANDRADE, DENIS VIEIRA. Temperature and dehydration effects on metabolism, water uptake and the partitioning between respiratory and cutaneous evaporative water loss in a terrestrial toad. Journal of Experimental Biology, v. 221, n. 24 DEC 2018. Web of Science Citations: 0.
DE OLIVEIRA ANDERSON, RODOLFO CESAR; BOVO, RAFAEL PARELLI; ANDRADE, DENIS VIEIRA. Seasonal variation in the thermal biology of a terrestrial toad, Rhinella icterica (Bufonidae), from the Brazilian Atlantic Forest. Journal of Thermal Biology, v. 74, p. 77-83, MAY 2018. Web of Science Citations: 4.
GOMES, GUILHERME; KOBERLE, ROLAND; VON ZUBEN, CLAUDIO J.; ANDRADE, DENIS V. Droplet bubbling evaporatively cools a blowfly. SCIENTIFIC REPORTS, v. 8, APR 19 2018. Web of Science Citations: 4.
GAVIRA, RODRIGO S. B.; SARTORI, MARINA R.; GONTERO-FOURCADE, MANUEL N.; GOMES, BRUNA F.; ABE, AUGUSTO S.; ANDRADE, DENIS V. The consequences of seasonal fasting during the dormancy of tegu lizards (Salvator merianae) on their postprandial metabolic response. Journal of Experimental Biology, v. 221, n. 8 APR 2018. Web of Science Citations: 1.
ANDERSON, RODOLFO C. O.; ANDRADE, DENIS V. Trading heat and hops for water: Dehydration effects on locomotor performance, thermal limits, and thermoregulatory behavior of a terrestrial toad. ECOLOGY AND EVOLUTION, v. 7, n. 21, p. 9066-9075, NOV 2017. Web of Science Citations: 11.
ANDERSON, RODOLFO C. O.; BOVO, RAFAEL P.; EISMANN, CARLOS E.; MENEGARIO, AMAURI A.; ANDRADE, DENIS V. Not Good, but Not All Bad: Dehydration Effects on Body Fluids, Organ Masses, and Water Flux through the Skin of Rhinella schneideri (Amphibia, Bufonidae). PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY, v. 90, n. 3, p. 313-320, MAY-JUN 2017. Web of Science Citations: 5.
BOVO, RAFAEL P.; ANDRADE, DENIS V.; TOLEDO, LUIS FELIPE; LONGO, ANA V.; RODRIGUEZ, DAVID; HADDAD, CELIO F. B.; ZAMUDIO, KELLY R.; GUILHERME BECKER, C. Physiological responses of Brazilian amphibians to an enzootic infection of the chytrid fungus Batrachochytrium dendrobatidis. DISEASES OF AQUATIC ORGANISMS, v. 117, n. 3, p. 245-252, JAN 13 2016. Web of Science Citations: 7.
TATTERSALL, GLENN J.; LEITE, CLEO A. C.; SANDERS, COLIN E.; CADENA, VIVIANA; ANDRADE, DENIS V.; ABE, AUGUSTO S.; MILSOM, WILLIAM K. Seasonal reproductive endothermy in tegu lizards. SCIENCE ADVANCES, v. 2, n. 1 JAN 2016. Web of Science Citations: 33.

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