Reports

Sex Ratio of Sea Turtles: Seasonal Changes

Science  17 Aug 1984:
Vol. 225, Issue 4663, pp. 739-741
DOI: 10.1126/science.225.4663.739

Abstract

Sex ratios of hatchling loggerhead turtles Caretta caretta taken from South Carolina and Georgia ranged from no females in nests laid in late May to 80 percent females in those laid in early July; the sex ratio decreased to 10 percent females in nests laid in early August. These seasonal changes are consistent with the role of temperature in directing sexual differentiation in various reptiles. The data have implications for understanding the demography of sea turtles and for their conservation.