Aquat. Living Resour.
Volume 9, Number 4, October-December 1996
|Page(s)||347 - 350|
|Published online||15 October 1996|
Heritability estimates of larval shell length in the Chilean blue mussel Mytilus chilensis, under different food densities
Instituto de Biologia Marina, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
Accepted: 30 September 1996
Heritability of larval growth rate in diferent food environments and genotype-food environment interaction (during larval growth) are estimated in Mytilus chilensis, based on a nested design, involving 24 full-sib families (8 males each mated to 3 separated females) grown under three different algal concentrations. The heritability estimates for larval shell length ranged between 0.2 ± 0.1 and 0.9 ± 0.3 and showed a decreased towards the low food treatment; but the values suggest that selection would be effective. However, since there is a significant genotype-food interaction, selection should be done in each environment in which the animals are expected to perform. The significant interaction term (p<0.001) associated with a significant genetic variability for larval growth suggest the presence of genes in the population whose expression depends upon local food conditions.
Key words: Mytilus chilensis / heritability / larval growth / Chile
© IFREMER-Gauthier-Villars, 1996
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