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Extensive allozyme monomorphism in a threatened species of freshwater mussel, Margaritifera hembeli Conrad (Bivalvia: Margaritiferidae)

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Abstract

A threatened but under-studied component offreshwater biodiversity in North America is thenative freshwater mussels (Bivalvia:Unionoidea: Margaritiferidae and Unionidae). Genetic data suggest that these mussel speciesgenerally exhibit levels of variability similarto other invertebrates. We surveyed allozymevariation in the Louisiana Pearlshell, Margaritifera hembeli (Margaritiferidae), athreatened freshwater mussel. Five examinedpopulations are monomorphic for 25 allozymeloci, the first report of a native freshwatermussel species with extensive allozymemonomorphism. Low genetic diversity appears tobe characteristic of margaritiferids, as anANOVA indicated that mussels of the familyMargaritiferidae have significantly lowerlevels of heterozygosity than the mussels ofthe family Unionidae. Margaritiferids havestrong habitat preferences and modification ofhabitat leads to rapid loss of populations.Although bottlenecks are known to cause lowgenetic variability, margaritiferids mayexhibit meta-population structure withextinction/re-colonization dynamics leading tolow genetic variability. Margaritiferidsgenerally exhibit a patchy distribution with acolonization rate that is approximately twicethat of extinction. Tests of themetapopulation hypothesis will requireadditional allozyme population genetic data aswell as hypervariable microsatellite loci.

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Authors and Affiliations

  1. Department of Biological Sciences, Louisiana State University, Baton Rouge, USA

    Jason P. Curole, David W. Foltz & Kenneth M. Brown

  2. Department of Biology, Marine Environmental Biology, University of Southern California, 3616 Trousdale Pkwy., Allan Hancock Foundation Building, Los Angeles, CA, 90089-0371, USA

    Jason P. Curole

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  1. Jason P. Curole
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  2. David W. Foltz
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Correspondence to Jason P. Curole.

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Curole, J.P., Foltz, D.W. & Brown, K.M. Extensive allozyme monomorphism in a threatened species of freshwater mussel, Margaritifera hembeli Conrad (Bivalvia: Margaritiferidae). Conservation Genetics 5, 271–278 (2004). https://doi.org/10.1023/B:COGE.0000030005.14751.76

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