Literaturdatenbank
Literaturdatenbank |
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Lewis-Winokur, V., & Winokur, R. M. (1995). Incubation temperature affects sexual differentiation, incubation time, and posthatching survival in desert tortoises (gopherus agassizi). Canadian Journal of Zoology, 73(11), 2091–2097.
Added by: Sarina Wunderlich (30 Jun 2012 22:01:15 UTC) |
| Resource type: Journal Article DOI: 10.1139/z95-246 BibTeX citation key: LewisWinokur1995 View all bibliographic details  |
Categories: General Keywords: Schildkröten = turtles + tortoises, Zeitigung = incubation Creators: Lewis-Winokur, Winokur Collection: Canadian Journal of Zoology |
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| Abstract |
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Testudinidae Eggs of captive desert tortoises. Gopherus agassizi, incubated at six temperatures (25, 27, 28, 29, 29.4, and 31 °C) produced 107 specimens. Eggs incubated at 31 °C resulted in a male to female sex ratio of 5:7; all other incubation temperatures resulted in males only. Histological examination of gonads revealed that the testes of newly hatched to 3-month-old individuals showed incomplete and poorly developed seminiferous tubules. Female gonads showed a thickened cortex. Incubation times were longer at lower temperatures. Both hatching success and hatchling survivorship were lower at lower incubation temperatures. We confirm that temperature-dependent sex determination occurs in desert tortoises and that the pivotal temperature is between 31 and 32 °C.
Added by: Sarina Wunderlich |