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Marine Ecology Progress Series

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MEPS 210:195-201 (2001)  -  doi:10.3354/meps210195

Estimating hatchling sex ratios of loggerhead turtles in Cyprus from incubation durations

B. J. Godley1, A. C. Broderick1, N. Mrosovsky2,*

1Marine Turtle Research Group, School of Biological Sciences, University of Wales Swansea, Swansea SA2 8PP, United Kingdom
2Departments of Zoology, Physiology and Psychology, University of Toronto, Toronto M5S 3G5, Canada
*Corresponding author. E-mail:

ABSTRACT: Incubation durations for loggerhead turtles Caretta caretta nesting at Alagadi, in Northern Cyprus, were recorded over 6 full seasons (1993 to 1998). Because incubation duration depends on temperature, it was possible to convert data on durations to hatchling sex ratios, using extensive data from other areas on the relationship between these 2 variables. It was estimated that 89 to 99% of the hatchlings produced on Alagadi beach were females. These findings provide a further instance of highly female-skewed sex ratios in loggerhead turtles.

KEY WORDS: Caretta caretta · Mediterranean · Sea turtle · Temperature · Sex ratios · Sex determination

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