Translator Disclaimer
1 August 2012 Temporal Genetic Similarity Among Year-Classes of the Pacific Geoduck Clam (Panopea generosa Gould 1850): A Species Exhibiting Spatial Genetic Patchiness
Author Affiliations +
Abstract
A previous study revealed genetic differences among collections of the commercially exploited geoduck clam (Panopea generosa) in Puget Sound, WA, but this heterogeneity did not follow an isolation-by-distance model. In this study, we investigated whether these differences were ephemeral or stable and tested predictions of the sweepstakes recruitment hypothesis, in which individuals show a high variance in reproductive success. We genotyped 11 allozyme and 7 microsatellite loci in 2,021 geoducks from 2 sites in Puget Sound and aged individuals by counting annuli in thin-section chondrophores under light microscopy. Genotypic data were then collated by year-class to test predictions of the sweepstakes recruitment hypothesis with allele count rarefaction, year-class relatedness, and 3 estimators of efective population size (Ne) using temporal shifts in allele frequencies. Although estimates of Ne were similar among year-classes, spatial shifts in allele frequencies and year-class strengths were detected among stations at 1 site, indicating that patchy settlement may be the result of an interaction between larval behavior during dispersal and hydrology.
Brent Vadopalas, Larry L. Leclair and Paul Bentzen "Temporal Genetic Similarity Among Year-Classes of the Pacific Geoduck Clam (Panopea generosa Gould 1850): A Species Exhibiting Spatial Genetic Patchiness," Journal of Shellfish Research 31(3), (1 August 2012). https://doi.org/10.2983/035.031.0314
JOURNAL ARTICLE
13 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top