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Seasonal Shifts in Body Temperature and Use of Microhabitats by Galapagos Land Iguanas (Conolophus Pallidus)

1983; Wiley; Volume: 64; Issue: 3 Linguagem: Inglês

10.2307/1939965

1939-9170

Keith A. Christian, C. Richard Tracy, Warren P. Porter,

Marine animal studies overview

EcologyVolume 64, Issue 3 p. 463-468 Article Seasonal Shifts in Body Temperature and Use of Microhabitats by Galapagos Land Iguanas (Conolophus Pallidus) Keith Christian, Keith ChristianSearch for more papers by this authorC. Richard Tracy, C. Richard TracySearch for more papers by this authorWarren P. Porter, Warren P. PorterSearch for more papers by this author Keith Christian, Keith ChristianSearch for more papers by this authorC. Richard Tracy, C. Richard TracySearch for more papers by this authorWarren P. Porter, Warren P. PorterSearch for more papers by this author First published: 01 June 1983 https://doi.org/10.2307/1939965Citations: 88AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Seasonal differences in the body temperatures (Tb) of free—ranging Galapagos land iguanas (Conolophus pallidus) were detected by temperature sensitive telemetry transmitters. Midday Tb's of iguanas average 4.4°C lower in the Garua (cool) season than in the Hot season. Measured Tb's and those predicted from biophysical models permitted the following conclusions: (1) lower Tb's during the Garua season represent an active shift in thermoregulation by the iguanas rather than a passive result of a cooler season; (2) the average midday Tb selected by the iguanas in either season is the Tb that allows maintenance of a constant Tb for the longest possible portion of the day; (3) by exploiting the warmer microclimate created by a cliff face, the iguanas are able to maintain a constant Tb for a full hour longer than they could elsewhere in their home range. Census data demonstrated that the iguanas exploited the warmer microclimate created by the cliff extensively during the Garua season, and the cliff face was visited by the iguanas relatively infrequently during the Hot season. Thus, the exploitation of the microclimate created by the cliff results in seasonal differences in the pattern of space utilization within the home ranges of the iguanas. Within the Garua season the iguanas moved away from the cliff more often on sunny days than during cloudy days. It is concluded that the physical environment is an important determinant of patterns of space utilization both within and between seasons. Citing Literature Volume64, Issue3June 1983Pages 463-468 RelatedInformation