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dc.contributor.authorvan Berkel, J.
dc.contributor.authorClusella-Trulla, S.
dc.date.accessioned2018-09-18T11:19:47Z
dc.date.available2018-09-18T11:19:47Z
dc.date.issued2018
dc.identifier.citationVan Berkel, J. Clusella-Trullas, S. (2018) Behavioral thermoregulation is highly repeatable and unaffected by digestive status in Agama atra. Integrative Zoology, 13(4): 482-493en_ZA
dc.identifier.issn1749-4877en_ZA
dc.identifier.urihttp://hdl.handle.net/123456789/2520
dc.description.abstractThe precision and the extent of behavioral thermoregulation are likely to provide fitness benefits to ectotherms. Yet the factors driving variation in selected or preferred body temperature (Tset) and its usefulness as a proxy for optimal physiological temperature (Topt) are still debated. Although Tset is often conserved among closely related species, substantial variation at the individual, population and species level has also been reported. However, the repeatability (calculated as the intra-class correlation coefficient) of Tset is generally low. One factor that influences Tset is feeding status, with fed reptiles typically showing higher Tset, a process thought to aid meal digestion. Here, using experiments simulating realistic feeding and fasting regimes in Agama atra, a heliothermic lizard from southern Africa, we test if Tset and its repeatability under these 2 states significantly differ. Daily Tset ranged from 33.7 to 38.4 °C, with a mean (± SE) of 36.7 ± 0.1 °C for fed and 36.6 ± 0.1 °C for unfed individuals. Comparisons of repeatability showed that females tend to be more consistent in the selection of body temperature than males, but not significantly so regardless of feeding status. We report some of the highest repeatability estimates of Tset to date (full range: 0.229–0.642), and that the weak positive effects of feeding status on Tset did not increase its repeatability. In conclusion, one of the major prerequisites for natural selection, consistent among-individual variation, is present, making the adaptive significance of Tset considerably more plausible.en_ZA
dc.language.isoenen_ZA
dc.publisherJohn Wiley & Sons Australia, Ltden_ZA
dc.subjectclimate changeen_ZA
dc.subjectco-adaptationen_ZA
dc.subjectevolutionary potentialen_ZA
dc.subjectspecific dynamic actionen_ZA
dc.subjectthermal preferenceen_ZA
dc.subjectinter-individual variationen_ZA
dc.titleBehavioral thermoregulation is highly repeatable and unaffected by digestive status in Agama atraen_ZA
dc.typeJournalArticlesen_ZA
dc.cibjournalIntegrative Zoologyen_ZA
dc.cibprojectNAen_ZA


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