Genetic population structure of the recently introduced Asian clam, Potamocorbula amurensis, in San Francisco Bay

Marine Biology
By:

Links

Abstract

The genetic population structure of the recently introduced Asian clam, Potamocorbula amurensis, in San Francisco Bay was described using starch gel electrophoresis at eight presumptive loci. Specimens were taken from five environmentally distinct sites located throughout the bay. The population maintains a high degree of genetic variation, with a mean heterozygosity of 0.295, a mean polymorphism of 0.75, and an average of 3.70 alleles per locus. The population is genetically homogeneous, as evidenced from genetic distance values and F-statistics. However, heterogeneity of populations was indicated from a contingency chi-square test. Significant deviations from Hardy-Weinberg equilibrium and heterozygote deficiencies were found at the Lap-1 locus for all populations and at the Lap-2 locus for a single population. High levels of variability could represent a universal characteristic of invading species, the levels of variability in the source population(s), and/or the dynamics of the introduction. Lack of differentiation between subpopulations may be due to the immaturity of the San Francisco Bay population, the “general purpose” phenotype genetic strategy of the species, high rates of gene flow in the population, and/or the selective neutrality of the loci investigated.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Genetic population structure of the recently introduced Asian clam, Potamocorbula amurensis, in San Francisco Bay
Series title Marine Biology
DOI 10.1007/BF00349562
Volume 119
Issue 2
Year Published 1994
Language English
Publisher Springer
Contributing office(s) San Francisco Bay-Delta, Toxic Substances Hydrology Program
Description 7 p.
First page 235
Last page 241
Country United States
State California
Other Geospatial San Francisco Bay
Online Only (Y/N) N
Additional Online Files (Y/N) N