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Journal Molluscan Studies Advance Access published online on October 10, 2005
Journal of Molluscan Studies, doi:10.1093/mollus/eyi055
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© The Author 2005. Published by Oxford University Studies on behalf of The Malacological Society of London, all rights reserved.
Received October 26, 2004
Accepted April 29, 2005

Article

PATTERNS OF GENETIC DIFFERENTIATION AND CONSERVATION OF THE SLABSIDE PEARLYMUSSEL, LEXINGTONIA DOLABELLOIDES (LEA, 1840) IN THE TENNESSEE RIVER DRAINAGE

PAUL J. GROBLER 1*, JESS W. JONES 2, NATHAN A. JOHNSON 2, BRAVEN BEATY 3, JENNIFER STRUTHERS 2, RICHARD J. NEVES 4, and ERIC M. HALLERMAN 2

1 Department of Biodiversity, School of Molecular and Life Sciences, University of Limpopo, P/Bag X1106, Sovenga, South Africa; Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0321, USA
2 Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0321, USA
3 The Nature Conservancy, Abingdon, VA, 24210 USA
4 U. S. Geological Survey, Virginia Cooperative Fish and Wildlife Research Unit, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0321, USA

* To whom correspondence should be addressed.
PAUL J. GROBLER, E-mail: paulg{at}ul.ac.za


  Abstract

The restoration and recovery of imperiled mussel species will require the re-establishment of populations into historically occupied habitats. The possible existence of genetic differentiation among populations should be considered before inter-basin transfers are made. Eighty individuals of the federal candidate species Lexingtonia dolabelloides were sampled from populations in the North Fork Holston, Middle Fork Holston, Clinch, Paint Rock and Duck rivers of the Tennessee River basin in the southeastern United States. We sequenced 603 base-pairs of a mitochondrial DNA gene (ND-1) and 512 base-pairs of a nuclear DNA gene (ITS-1). Analyses of molecular variation (AMOVA) values for both genes indicated that the majority of variation in L. dolabelloides resided within populations (82.9-88.3%), with 11.7-17.1% of variation among populations. Haplotype frequencies differed significantly among populations for both genes sequenced. Clustering of haplotypes in minimum-spanning networks did not conform stringently to population boundaries, reflecting high within-population and low between-population variability. Maximum parsimony analysis did not identify any population as a monophyletic lineage. A Mantel test showed no significant correlation between geographical stream distance and genetic distance, thus not supporting a pattern of isolation-by-distance. Overall, results provided support to manage fragmented populations of L. dolabelloides in the Tennessee River drainage as two management units (MUs), but did not provide evidence for the existence of ESUs following published molecular criteria.


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