Maintenance of Heterozygosity during Selective Breeding of Oysters for Resistance to MSX Disease
- 1 November 1990
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Heredity
- Vol. 81 (6), 418-423
- https://doi.org/10.1093/oxfordjournals.jhered.a111018
Abstract
Allozyme variation was examined in five strains of oysters (Crassostrea virginica) that had been subjected to several generations of intense selection for resistance to the protozoan parasite Haplosporidium nelsoni (MSX). Pedigree records permitted us to estimate expected levels of heterozygosity for the selected strains and to compare the observed levels of heterozygosity with those in geographically related wild stocks. In all five strains, mean heterozygosity across six highly polymorphic gene loci was not lost at the rate predicted by the inbreeding model. However, significant losses of rare alleles occurred in each strain, allowing us to exclude contamination of the selected strains by wild oysters. Both selective and nonselective explanations for the maintenance of heterozygosity in these oysters are discussed.This publication has 10 references indexed in Scilit:
- Infection and Mortality Patterns in Strains of Oysters Crassostrea virginica Selected for Resistance to the Parasite Haplosporidium nelsoni (MSX)Journal of Parasitology, 1987
- Hard clam, Mercenaria mercenaria, broodstocks: Genetic drift and loss of rare alleles without reduction in heterozygosityAquaculture, 1987
- Physiological and Genetic Aspects of Growth in the Mussel Mytilus edulis. I. Oxygen Consumption, Growth, and Weight LossPhysiological Zoology, 1986
- POPULATION BOTTLENECKS AND NONEQUILIBRIUM MODELS IN POPULATION GENETICS. II. NUMBER OF ALLELES IN A SMALL POPULATION THAT WAS FORMED BY A RECENT BOTTLENECKGenetics, 1985
- STATISTICAL ANALYSIS OF HETEROZYGOSITY DATA: INDEPENDENT SAMPLE COMPARISONSEvolution, 1985
- Allele frequencies after a bottleneckTheoretical Population Biology, 1984
- Population genetics of the American oyster Crassostrea virginica along the Atlantic coast and the Gulf of MexicoMarine Biology, 1983
- ENZYME HETEROZYGOSITY ASSOCIATED WITH GROWTH AT DIFFERENT DEVELOPMENTAL STAGES IN OYSTERSCanadian Journal of Genetics and Cytology, 1982
- GENETIC VARIATION ASSOCIATED WITH GROWTH RATE IN THE AMERICAN OYSTER (CRASSOSTREA VIRGIN ICA )Evolution, 1978
- Minchinia nelsoni n. sp. (Haplosporida, Haplosporidiidae): Causative Agent of the Delaware Bay Oyster EpizoöticScience, 1966