Literaturdatenbank
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Rostal, D. C., Wibbels, T., Averill-Murray, R. C., Stitt, E. W., & Riedle, J. D. 2003, February 21—23 Temperature-dependent sex determination in north american tortoises, gopherus agassizii and gopherus polyphemus. Unpublished paper presented at 28th Annual Meeting and Symposium of the Desert Tortoise Council.
Added by: Sarina Wunderlich (27 Apr 2009 12:12:46 UTC) |
| Resource type: Conference Paper BibTeX citation key: Rostal View all bibliographic details  |
Categories: General Keywords: Gopherus, Gopherus agassizii, Gopherus polyphemus, Habitat = habitat, Nordamerika = North America, Testudinidae, Zeitigung = incubation Creators: Averill-Murray, Riedle, Rostal, Stitt, Wibbels Collection: 28th Annual Meeting and Symposium of the Desert Tortoise Council |
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| URLs http://www.desertt ... 003/2003abs57.html |
| Abstract |
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Two of the four North American tortoise species (Gopherus agassizii and Gopherus polyphemus) show temperature-dependent sex determination (TSD). Both species have extensive latitudinal ranges varying in xeric habitat structure. Gopherus agassizii occurs in the Sonoran and Mojave Deserts, from Southwestern Utah to Alamos, Mexico, while G. polyphemus occurs in the southeastern U.S, from southern Florida to southern South Carolina and west to Louisiana. Gopherus agassizii displays one of the highest pivotal temperatures (31.3 C) for a turtle species while G. polyphemus displays a pivotal temperature similar to other turtle species in its range (29.3 C). Temperature dataloggers were set in latitudinal arrays throughout both species U.S. ranges to measure ground temperatures in suitable nest site areas including one site which extended beyond the northern-most range for both species. All other sites had tortoises present or exhibited suitable vegetation characteristics. Variation in ground temperature of nest site choices by females was compared to laboratory based pivotal temperatures for both species. Timing of nesting and nest site locations by females in different regions provided temperature conditions near laboratory pivotal temperatures during the critical period of incubation. Relationships between timing of nesting, nest site choice and northern range extent for these species will be discussed.
Added by: Sarina Wunderlich |
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WIF
Added by: Sarina Wunderlich |