Abstract - Invertebrate Biology, 2002


Some species of desert ephemeral pool-dwelling branchiopod crustaceans can reproduce uniparentally through selfing as well as by mating with a male. One such species is the clam shrimp Eulimnadia texana, where males coexist with hermaphrodites. Hermaphrodites can mate with males or self their own eggs but cannot mate with other hermaphrodites. Understanding the evolutionary dynamics of this mixed mating system, known as androdioecy, requires a basic knowledge of the reproductive behavior of this species. Here we describe in detail the reproductive cycle of hermaphrodites when isolated and when in the presence of a male. Video analysis was used to provide a description of egg movement from the ovotestes to the brood chamber. Through the use of time-lapse photography we determined that paired hermaphrodites carried their brood longer and swam fast for a greater duration than isolated hermaphrodites. However, isolated hermaphrodites dug more preliminary burrows prior to burying their clutch and had longer inter-clutch intervals than did paired hermaphrodites. The possible evolutionary significance of these differences is discussed.



Last Updated : 8/12/02

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