Genetic differentiation ofMytilus edulis in eastern North America

Koehn, Richard K.; Hall, J. G.; Innes, David J.; Zera, Anthony J.

doi:10.1007/bf00951820

Cited by 119 publications

(77 citation statements)

References 26 publications

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“…One or more of these features has been invoked to account for these observations in marine species (Koehn et al, 1984;Benzie and Stoddard, 1992;Karl and Avise, 1992;Hare and Avise, 1996). We have suggested above that null alleles are not likely to account for heterozygote deficiencies noted in these data and selection and assortative mating are not likely to be the factors influencing the distribution of alleles at microsatellite loci (Lander, 1989).…”

Section: Discussionmentioning

confidence: 76%

Stock Identification of Gag, Mycteroperca microlepis, Along the Southeast Coast of the United States

et al. 1999

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Abstract:The gag grouper Mycteroperca microlepis is an important component of commercial and recreational fisheries along the South Atlantic coast of the United States and in the Gulf of Mexico. Over the past two decades, this species has experienced significant declines in abundance and an increasing skew in sex ratios.Analysis of microsatellite DNA variation in this species shows mosaic patterns of population subdivision and significant departures from Hardy-Weinberg equilibrium in all sampling locations. Given the length of the pelagic stage (egg and larvae), the prevailing current patterns, and the migratory capabilities of the adults, it is unlikely that these observations are the result of restricted gene flow among genetically differentiated populations. The apparent structure of gag populations most likely reflects inbreeding in size-limited populations.Population declines, skewed sex ratios, and perhaps variance in female fecundity appear to have acted in concert to limited the number of individuals that contribute to a given year class. These data are reinforced by studies of other fish stocks that have experienced precipitous declines over the past two decades.

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Section: Discussionmentioning

confidence: 76%

Stock Identification of Gag, Mycteroperca microlepis, Along the Southeast Coast of the United States

et al. 1999

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“…In the blue mussel, Mytilus edulis, off the east coast of North America, 3 genetic groups are recognised (Koehn et al 1984); in the scallop Chlamys opercularis,ofi\he coast of north-west Europe, 4 groups (Beaumont 1982), and in the green-lipped mussel, Perna canaliculus, around New Zealand, 2 groups (Smith 1988). Therefore, genetic differentiation is occurring in populations of marine molluscs in spite of the possibility for extensive gene flow and mixing through dispersal of pelagic eggs and larvae.…”

Section: Discussionmentioning

confidence: 99%

Regional variation in electromorph frequencies in the tuatua,Paphies subtriangulata,around New Zealand

Smith

MacArthur

Michael

1989

New Zealand Journal of Marine and Freshwater Research

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Four polymorphic enzyme loci were tested in 13 samples of tuatua, Paphies subtriangulata, from around New Zealand. Statistical analyses of the distribution of electromorphs indicate 3 geographical groups: north, central, and Chatham Islands. One sample from Stewart Island may represent a fourth southern group owing to its geographical isolation and genetic differences with the central group. It is suggested that the genetic differentiation is maintained by current movements which restrict gene flow between regions. Samples from the Chatham Islands showed lower heterozygosities than mainland samples. This offshore island group is beyond the normal limits of larval dispersal from mainland populations.

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“…Standard electrophoretic techniques as described by Harris & Hopkinson (1976) and Allendorf et al (1977) were employed. Two gel buffer systems were used: Poulik (Selander et al 1971) and Tris-maleate (Koehn et al 1984); stain recipes followed Allendorfetal. ( 1977) and Richardson et al (1986).…”

Section: Methodsmentioning

confidence: 99%

Biochemical‐genetic variation in a wild and a cultured population of the greenshell mussel,Perna canaliculus

Gardner

Eyles

Pande

1996

New Zealand Journal of Marine and Freshwater Research

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A wild and a cultured greenshell mussel (Perna canaliculus) population were compared for biochemical genetic variation at seven polymorphic and four monomorphic allozyme loci. Significant heterozygote deficiencies were observed for all polymorphic loci Lap,2, Pgi, and Pgm) for both populations (except the Pgi locus of the wild mussel population). Genotypic disequilibrium was calculated for both populations: genotypic frequencies were significantly nonrandom at three pairs of loci among the wild mussels, and significantly non-random at three different pairs of loci among the cultured mussels. All six pairs of loci which exhibited significant genotypic disequilibrium involved aminopeptidases, suggesting that these loci form a linkage group, and that neither the Pgi nor the Pgm loci are associated with this group. Exact tests for population differentiation based upon populationspecific allele distributions indicated that four of the polymorphic loci were significantly heterogeneous among the two populations, whereas the remaining three polymorphic loci were not. Based upon the private allele system, the number of migrants (N m ) between the populations was estimated to be 2.009, which, according to the private allele system, represents a high level of gene flow. These findings are discussed with regard to the population biology and genetic structure of this species. M96028

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Genetic differentiation ofMytilus edulis in eastern North America

Cited by 119 publications

References 26 publications

Stock Identification of Gag, Mycteroperca microlepis, Along the Southeast Coast of the United States

Stock Identification of Gag, Mycteroperca microlepis, Along the Southeast Coast of the United States

Regional variation in electromorph frequencies in the tuatua,Paphies subtriangulata,around New Zealand

Biochemical‐genetic variation in a wild and a cultured population of the greenshell mussel,Perna canaliculus

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