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The goniobasis of southern virginia and northwestern north carolina usa genetic and shell morphometric relationships

The goniobasis of southern virginia and northwestern north carolina usa genetic and shell morphometric relationships

Malacologia 20(1): 83-98

ISSN/ISBN: 0076-2997

Three species of Goniobasis inhabiting the upper New River and surrounding drainages, G. proxima, G. semicarinata and G. simplex, are very distinct, based upon starch gel electrophoresis studies. Heterozygosity (H) is low, averaging 0.0113 across 12 populations and 15 loci. The average genetic identity between conspecific populations is 0.89, also very low compared to averages recorded in other animals. Much of the difference between conspecific populations is due to fixation of alternative alleles, suggesting that gene flow even among populations connected through water can be quite low, or that selection is high. Three races are provisionally recognized in both G. proxima and G. semicarinata on the basis of differences in isozyme frequencies. Compared to electrophoresis, species identification using shell morphology alone was unreliable. A population indistinguishable from G. simplex after a multidimensional scaling based on 7 shell characters was G. proxima using electrophoresis. The unusual shell morphology of this population may result from the introduction of the normally softwater-dwelling G. proxima into a hard-water stream similar to those inhabited by G. simplex. If divergence is measured as Euclidean distance to species centroid after multidimensional scaling, the amount of population divergence in shell character is correlated to the amount of genetic divergence at the 0.05 level.

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Accession: 006684732

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