Abstract
’Address for correspondence. larva. Gametes are shed into the water where fertilization occurs, and larvae remain in the plankton for approximately 10 d before settling (Walz 1978; Lewandowski 1982b). The Great Lakes population appears to be derived from a single founding group (Griffiths et al. 1991); thus, migration from other, genetically distinct populations can be discounted as an explanation for any genetic differences observed among life history stages. Furthermore, D. polymorpha is the only mollusk in most of the Great Lakes with a planktonic larval stage thus, problems associated with identification of larvae are avoided. We examined allozyme frequencies throughout the life history of D. polymorpha in the Great Lakes in order to directly compare the genetic structure of the planktonic larvae with that of benthic stages.
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