Abstract
indicated the existence of three white perch stocks in Chesapeake Bay. The results suggest that significant mixing occurs among populations residing in tributaries of the eastern and upper shores of the Bay. Divergence was greater among lower Bay populations and may result from restricted migration due to the salinity preferences of M. americana. Salinity barriers to genetic exchange may break down during episodic weather events. Restriction profiles also suggest that M. americana is heteroplasmic, i.e., single individuals contain several distinct fragment length polymorphisms that differ by 110 base pairs. No heteroplasmy for restriction site variation was observed.
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