Journal article
Temperature Dependent Sex Determination in the Green Turtle (Chelonia mydas): Effects on the Sex Ratio on a Natural Nesting Beach
Herpetologica, Vol.43(1), pp.74-81
01 Mar 1987
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Temperatures of natural nests of green turtles, Chelonia mydas, determined the sex of hatchlings at Tortuguero, Costa Rica. The beach could be divided into three distinct thermal zones: Zone 1-Low Beach, above high water mark up to sparse vegetation; Zone 2-Mid-Beach, area of sparsely vegetated sand up to dense jungle vegetation; Zone 3-High Beach, area of dense vegetation. At depths of 30 and 50 cm, sand temperatures in the High Beach were significantly lower than those in the Low Beach and Mid-Beach. Temperatures <28.5 C produced males and temperatures >30.3 C produced primarily females. Nests in the Low and Mid-Beach produced 72.0% and 87.0% female hatchlings while nests in the High Beach produced significantly fewer (7.4%) females. There were no seasonal trends in soil temperatures or sex ratios of hatchlings. The primary sex ratio computed for the entire beach for the 1977 nesting season was 67:33 female: male.
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Details
- Title
- Temperature Dependent Sex Determination in the Green Turtle (Chelonia mydas): Effects on the Sex Ratio on a Natural Nesting Beach
- Creators
- James R. SpotilaEdward A. StandoraStephen J. MorrealeGeorgita J. Ruiz
- Publication Details
- Herpetologica, Vol.43(1), pp.74-81
- Publisher
- Herpetologists' League
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES); [Retired Faculty]
- Identifiers
- 991021013204604721
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- Domestic collaboration
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- Zoology