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Genetic structure of bay anchovy (Anchoa mitchilli) populations in Chesapeake Bay

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Abstract

To determine the genetic structure of the bay anchovy (Anchoa mitchilli) within Chesapeake Bay, 16 isozyme systems encoding 21 loci for 20 population were examined using horizontal starch gel electrophoresis. Contingency Chisquare analysis revealed significant allelic frequency differences at nine loci (AAT-1, AAT-2, ALD-1, CPK-2, GAP-1, GLY-1, LDH-1, MDH-1, and MDH-2). Two loci, ALD-1 and MDH-1, were responsible for nine of 14 tests not conforming to Hardy-Weinberg expectations, with some of these deviations attributed to possible scoring and/or sampling error. Estimates for mean average heterozygosity were relatively high, ranging from 0.40 to 0.096, with 33–57% of the loci polymorphic. A low Fst value (0.041) along with high genetic identity estimates (I=0.997) indicated little substructuring of bay anchovy populations within Chesapeake Bay.

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Authors and Affiliations

  1. Center for Estuarine and Environmental Studies Appalachian Environmental Laboratory, University of Maryland System, 21532, Frostburg, Maryland

    Raymond P. Morgan & Bruce M. Baker

  2. Department of Biology, Frostburg State University, 21532, Frostburg, Maryland

    James H. Howard

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  1. Raymond P. Morgan
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  2. Bruce M. Baker
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  3. James H. Howard
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Morgan, R.P., Baker, B.M. & Howard, J.H. Genetic structure of bay anchovy (Anchoa mitchilli) populations in Chesapeake Bay. Estuaries 18, 482–493 (1995). https://doi.org/10.2307/1352366

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