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Trade-off between behavioral thermoregulation and hydration status in the false coral snake Oxyrhopus guibei (Serpentes, Dipsadidae)

Grant number: 17/21747-8
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): April 01, 2018
Effective date (End): April 30, 2019
Field of knowledge:Biological Sciences - Ecology
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Carlos Arturo Navas Iannini
Grantee:Dylan Jose Padilla Perez
Host Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):18/17251-0 - Does thermoregulation drive the evolution of dorsal coloration in tropidurid lizards?, BE.EP.MS


Most reptiles actively thermoregulate by using behavioral adjustments to achieve andmaintain their preferred body temperature. However, the pursuit of a thermal optima isaccompanied by a trade-off with potential water loss. likewise, there are a wide range of otherlife-history traits that governed behavioral thermoregulation, such as food consumption. Hence,thermoregulatory behavior should be a trade-off among all these physiological activities. Theaim of this study is to test the hypotheses that: (1) individuals of the false coral snake Oxyrhopusguibei under moderate dehydration preferred lower ambient temperature than hydrated ones infavor of water conservation, and that (2) individuals of the false coral snake O. guibei undermoderate dehydration, after feeding, exhibit a greater extent of behavioral thermoregulationthan unfed hydrated ones without paying any desiccation costs, since they can rely on dietaryand metabolic water produced. In order to accomplish this, we will use a full factorial design(2" runs) to test the effect of two factors at two levels on the preferred temperature selected bythe snakes in a thermal gradient. We expect that dehydrated snakes will select lower ambienttemperatures than hydrated ones in the thermal gradient. However, we also expect that waterconservation will be probably abandoned when dehydrated snakes are fed, allowing them tolook for higher temperatures compared to unfed dehydrated individuals. (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)
PADILLA PEREZ, DYLAN J.; DE CARVALHO, JOSE E.; NAVAS, CARLOS A.. Effects of food intake and hydration state on behavioral thermoregulation and locomotor activity in the tropidurid lizard Tropidurus catalanensis. Journal of Experimental Biology, v. 224, n. 6, . (14/16320-7, 17/21747-8)
VIMMERSTEDT, JON C.; PADILLA PEREZ, DYLAN J.; ANGILLETTA, JR., MICHAEL J.; VANDENBROOKS, JOHN M.. Oxygen supply limits the heat tolerance of avian embryos. BIOLOGY LETTERS, v. 15, n. 11, . (17/21747-8, 18/17251-0)

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