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Science 11 June 1982:
Vol. 216. no. 4551, pp. 1245 - 1247
DOI: 10.1126/science.7079758
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Articles

Science, Vol 216, Issue 4551, 1245-1247
Copyright © 1982 by American Association for the Advancement of Science

articles

Temperature-dependent sex determination: current practices threaten conservation of sea turtles

SJ Morreale, GJ Ruiz, Spotila JR, and EA Standora

Temperature determines the sex of hatchling green turtles (Chelonia mydas) produced from eggs incubated in a beach hatchery under different temperature regimens. Cola and cool nests (less than 28 degrees C) produced almost no females (0 to 10 percent) and warm, thermostable nests (greater than 29.5 degrees C) produced almost all females (95 to 100 percent). A few intersex hatchlings were produced at lower temperatures. Since little concern is given to temperatures at which sea turtle eggs are incubated in artificial hatcheries, present conservation practices may be producing all male, all female, or even intersex hatchlings.


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