Abstract
Three possible causes of intersexuality in Gammarus duebeni, a crustacean with environmental sex determination, were investigated. Intersexuality appears to be a cost of the flexible sex‐determining mechanism of this species: the occurrence of intersexes is influenced by photoperiod, which also cues sex determination. Intersexuality is heritable: intersex mothers produce more intersex offspring than do true females. Parasitism by a feminizing microsporidian is ruled out as a significant cause of intersexuality.
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