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Intersexuality in Gammarus Duebenii (Amphipoda), a Cost Incurred in Populations With Environmental Sex Determination?

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We present a field study to test the hypothesis that intersexuality is a cost of environmental sex determination in Gammarus duebenii. Intersexes are more frequent in a population with a high level of environmental sex determination (ESD) than in a population where few individuals respond to environment cues for sex determination. In a population with a high level of ESD, intersexes are significantly positively correlated with the sex ratio produced under ESD. Intersex frequency is significantly related to the interaction of photoperiod and temperature which the young experience during sex determination.

Affiliations: 1: Department of Pure and Applied Biology, University of Leeds, LS2 9JT, United Kingdom; 2: Department of Pure and Applied Biology, Imperial College at Silwood Park, Ascot, SL5 7PY, United Kingdom, Department of Genetics, University College London, Wolfson House, 4 Stephenson Way, London, NW1 2HE, United Kingdom

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