Abstract
Summary Depending on environmental conditions, 2 different male forms both capable of mating were observed in a marine copepod parasite of ascidians (Urochordata). Results of new experiments indicate the nature of these external factors. The occurrence of atypical males is linked to restricted amounts of food whereas occurrence of typical males correlates with the presence of a female and more abundant food. This type of sex regulation is not known in copepods and this contribution adds a new dimension to our knowledge of these processes. Here we provide the evidence of adaptative variation in environmental and genetic sex determination within a parasite species.
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