South Florida's loggerhead (Caretta caretta), green (Chelonia mydas) and leatherback (Dermochelys coriacea ) sea turtles hatchling have environmentally determined sex. The in situ nest mean hatchling sex ratios (SR) were highly femalebiased: loggerhead F=0.89) and green turtle F=0.81; leatherback's SR was nearly balanced (0.55F). Nest temperatures and SRs differed between leatherbacks and loggerhead and green turtles. The latter two did not differ. The loggerhead response parameters were estimated within biological limitations by both 50-65% of incubation and mean middle 1/3 temperature. The maximum middle 1/3 temperature was the best-fit predictor for green turtles. No best-fit sex ratio-temperature response could be identified for leatherbacks. Clutches incubating under natural conditions can vary greatly in SR; TRT differences may account for differences among species' sex ratios.
|Commitee:||Milton, Sarah, Murphey, Rodney K., Noonburg, Erik, Perry, Gary W., Rosson, Barry T.|
|School:||Florida Atlantic University|
|School Location:||United States -- Florida|
|Source:||MAI 52/01M(E), Masters Abstracts International|
|Subjects:||Wildlife Conservation, Zoology|
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