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Title: Population Genetics and Pattern of Larval Dispersal of the Endemic Hawaiian Freshwater Amphidromous Gastropod Neritina granosa (Prosobranchia: Neritidae) 
Author: Hodges, Marc H.; Allendorf, Fred W.
Date: 1998-07
Publisher: University of Hawaii Press
Citation: Hodges MH, Allendorf FW. 1998. Population genetics and pattern of larval dispersal of the endemic Hawaiian freshwater amphidromous gastropod Neritina granosa (Prosobranchia: Neritidae). Pac Sci 52(3): 237-249.
Abstract: Protein electrophoresis was used to study the population genetics
of the endemic Hawaiian freshwater amphidromous gastropod Neritina granosa
Sowerby. The genetic information was used to infer the pattern and degree
of planktonic larval dispersal. Samples were taken from 12 streams located
throughout the Hawaiian Archipelago during July, August, and September
1991. Overall mean heterozygosity was 0.052. Heterozygote deficiency was
comparable with that found in other mollusks and marine invertebrates. Gene
flow was substantial and was generally sufficient to maintain similar allele frequencies
among stream populations. An island model of migration was indicated.
However, significant heterogeneity among populations was observed
and was due primarily to three geographically disparate streams. Causes of
deficiency and heterogeneity remain unknown. Demographic information suggests
that, although high from a genetic point of view, the rate of migration
calculated from gene flow might be insufficient to affect demographic processes
in large populations of N. granosa.
ISSN: 0030-8870

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