Thermoregulatory consequences of salt loading in the lizard Pogona vitticeps

dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorINCT Fisiol Comparada
dc.contributorBrock Univ
dc.creatorScarpellini, Carolina da Silveira [UNESP]
dc.creatorBicego, Kenia C. [UNESP]
dc.creatorTattersall, Glenn J.
dc.date2015-10-21T20:25:29Z
dc.date2015-10-21T20:25:29Z
dc.date2015-04-01
dc.date.accessioned2023-09-12T06:49:04Z
dc.date.available2023-09-12T06:49:04Z
dc.identifierhttp://jeb.biologists.org/content/218/8/1166
dc.identifierJournal Of Experimental Biology. Cambridge: Company Of Biologists Ltd, v. 218, n. 8, p. 1166-1174, 2015.
dc.identifier0022-0949
dc.identifierhttp://hdl.handle.net/11449/129129
dc.identifier10.1242/jeb.116723
dc.identifierWOS:000354114900011
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8778469
dc.descriptionPrevious research has demonstrated that dehydration increases the threshold temperature for panting and decreases the thermal preference of lizards. Conversely, it is unknown whether thermoregulatory responses such as shuttling and gaping are similarly influenced. Shuttling, as an active behavioural response, is considered one of the most effective thermoregulatory behaviours, whereas gaping has been proposed to be involved in preventing brain over-heating in lizards. In this study we examined the effect of salt loading, a proxy for increased plasma osmolality, on shuttling and gaping in Pogona vitticeps. Then, we determined the upper and lower escape ambient temperatures (UETa and LETa), the percentage of time spent gaping, the metabolic rate ((V) over dot(O2)), the evaporative water loss (EWL) during gaping and non-gaping intervals and the evaporative effectiveness (EWL/(V) over dot(O2)) of gaping. All experiments were performed under isotonic (154 mmol l(-1)) and hypertonic saline injections (625, 1250 or 2500 mmol l(-1)). Only the highest concentration of hypertonic saline altered the UETa and LETa, but this effect appeared to be the result of diminishing the animal's propensity to move, instead of any direct reduction in thermoregulatory set-points. Nevertheless, the percentage of time spent gaping was proportionally reduced according to the saline concentration; (V) over dot(O2) was also decreased after salt loading. Thermographic images revealed lower head than body surface temperatures during gaping; however this difference was inhibited after salt loading. Our data suggest that EWL/(V) over dot(O2) is raised during gaping, possibly contributing to an increase in heat transfer away from the lizard, and playing a role in head or brain cooling.
dc.descriptionScience Without Borders (Brazil)
dc.descriptionEmerging Leaders in Americas Program (ELAP; Canada)
dc.descriptionNatural Sciences and Engineering Council of Canada (NSERC)
dc.descriptionSao Paulo State Univ, Coll Agr &Vet Sci, Dept Anim Morphol &Physiol, BR-14884900 Sao Paulo, Brazil
dc.descriptionINCT Fisiol Comparada, Natl Inst Sci &Technol Comparat Physiol, Jaboticabal, SP, Brazil
dc.descriptionBrock Univ, Dept Biol Sci, St Catharines, ON L2S 3A1, Canada
dc.descriptionSao Paulo State Univ, Coll Agr &Vet Sci, Dept Anim Morphol &Physiol, BR-14884900 Sao Paulo, Brazil
dc.descriptionNatural Sciences and Engineering Council of Canada (NSERC): RGPIN-2014-05814
dc.format1166-1174
dc.languageeng
dc.publisherCompany Of Biologists Ltd
dc.relationJournal Of Experimental Biology
dc.relation3.179
dc.relation1,611
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.subjectGaping
dc.subjectShuttling
dc.subjectMetabolic rate
dc.subjectEvaporative water loss
dc.subjectBrain cooling
dc.titleThermoregulatory consequences of salt loading in the lizard Pogona vitticeps
dc.typeArtigo


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