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Heterozygosity–fitness correlations in the gilthead sea bream Sparus aurata using microsatellite loci from unknown and gene‐rich genomic locations
Author(s) -
Borrell Y. J.,
Carleos C. E.,
Sánchez J. A.,
Vázquez E.,
Gallego V.,
Asturiano J. F.,
Blanco G.
Publication year - 2011
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2011.03099.x
Subject(s) - biology , loss of heterozygosity , inbreeding , microsatellite , outbreeding depression , locus (genetics) , genetics , population , evolutionary biology , broodstock , effective population size , zoology , genetic variation , gene , fish <actinopterygii> , allele , aquaculture , fishery , demography , sociology
Heterozygosity–fitness correlations (HFC) were assessed for a sample of a gilthead sea bream Sparus aurata population. Two hundred and seventy‐one fish were genotyped at 22 known and novel microsatellite loci, from which correlations between the multilocus heterozygosity index ( I MLH ) and various fitness traits (fork length, mass and specific growth rates) were calculated. Significant global HFCs were found in this sample (0·02 ≤ r 2 ≤ 0·08). In addition, all the significant correlations found in this work were negative, indicating that heterozygotes had lower fitness than their homozygote counterparts. Marker location could not explain the observed HFCs. Evidence of inbreeding, outbreeding or population and family structuring was not found in this work. The presence of undetected general effects that may lead to the appearance of HFCs, however, cannot be ruled out. These results seem to be best explained by the occurrence of local effects (due to linkage) or even by possible direct locus advantages.