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The Journal of Heredity 2002:93(4)
© 2002 The American Genetic Association 93:238-248

Selection Against Blue Mussels (Mytilus edulis L.) Homozygotes Under Various Stressful Conditions

B. Myrand, R. Tremblay, and J.-M. Sévigny

From the Station Technologique Maricole des Îles-de-la-Madeleine, Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec, Cap-aux-Meules, Québec, Canada G0B 1B0 (Myrand); Centre aquicole marin-Université du Québec à Rimouski, Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec, Grande-Rivière, Québec, Canada G0C 1V0 (Tremblay); and Ministère des Pêches et des Océans, Institut Maurice-Lamontagne, Mont-Joli, Québec, Canada G5H 3Z4 (Sévigny).

Address correspondence to Bruno Myrand at the address above, or e-mail: bruno.myrand{at}agr.gouv.qc.ca.

Three mussel groups differing in mean multilocus heterozygosity (MLH) were used to examine the MLH-fitness relationship. Mussels were submitted to aerobic and anaerobic stressful conditions in the laboratory, and their LT50 was measured. Mortality was not random in two of the three groups and affected the homozygous individuals more. This selective mortality caused a significant increase in the mean MLH of the survivors, but only for the two groups characterized by the lowest initial MLH and significant deficits in heterozygotes at the onset of the experiments. While these experiments were ongoing, the same two groups also suffered a 40% mortality rate in lantern nets under field conditions. This mortality also increased the mean MLH in survivors. All groups showed strong inverse relationships between MLH and standard metabolism. Our results suggest that the higher resistance of more heterozygous individuals is related to their lower metabolic needs.


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