Testing mate choice and overdominance at MH in natural families of Atlantic salmon Salmo salar

This study aimed to test mate choice and selection during early life stages on major histocompatibility (MH) genotype in natural families of Atlantic salmon Salmo salar spawners and juveniles, using nine microsatellites to reconstruct families, one microsatellite linked to an MH class I gene and one...

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Bibliographic Details
Published in:Journal of fish biology 2017-04, Vol.90 (4), p.1644-1659
Main Authors: Tentelier, C., Barroso‐Gomila, O., Lepais, O., Manicki, A., Romero‐Garmendia, I., Jugo, B. M.
Format: Article
Language:English
Subjects:
Alleles
Animals
Biodiversity and Ecology
Environmental Sciences
field
Fish
Gene Expression Regulation - physiology
Genotype
Heterozygote
heterozygote advantage
Homozygote
immunity
Major Histocompatibility Complex - genetics
Major Histocompatibility Complex - physiology
Mating Preference, Animal - physiology
MHC
Microsatellite Repeats
Minors
mixed model
Salmo salar - genetics
Salmo salar - physiology
Salmon
survival
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Summary:This study aimed to test mate choice and selection during early life stages on major histocompatibility (MH) genotype in natural families of Atlantic salmon Salmo salar spawners and juveniles, using nine microsatellites to reconstruct families, one microsatellite linked to an MH class I gene and one minisatellite linked to an MH class II gene. MH‐based mate choice was only detected for the class I locus on the first year, with lower expected heterozygosity in the offspring of actually mated pairs than predicted under random mating. The genotype frequencies of MH‐linked loci observed in the juveniles were compared with frequencies expected from Mendelian inheritance of parental alleles to detect selection during early life stages. No selection was detected on the locus linked to class I gene. For the locus linked to class II gene, observed heterozygosity was higher than expected in the first year and lower in the second year, suggesting overdominance and underdominance, respectively. Within family, juveniles' body size was linked to heterozygosity at the same locus, with longer heterozygotes in the first year and longer homozygotes in the second year. Selection therefore seems to differ from one locus to the other and from year to year.
ISSN:0022-1112
1095-8649
DOI:10.1111/jfb.13260