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Introgressive hybridization between wild and domestic individuals and its relationship with parasitism in brook charr Salvelinus fontinalis
Author(s) -
Gossieaux Philippine,
Sirois Pascal,
Bernatchez Louis,
Garant Dany
Publication year - 2018
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/jfb.13752
Subject(s) - salvelinus , biology , fontinalis , introgression , parasitism , stocking , ecology , zoology , population , genetic diversity , fishery , trout , fish <actinopterygii> , host (biology) , demography , gene , genetics , sociology
The effects of introgression on parasitism in brook charr Salvelinus fontinalis were investigated in 28 lakes with various levels of stocking in Québec, Canada. No effect of genetic background on parasitism was found at the individual level. Body length seemed to explain most of the variation observed at this level, with largest fish being more infected. However, lakes with the greater average domestic genetic background were found to display significantly lower parasite prevalence and diversity. Since our results indicate no effect of domestic genes at the individual level, the negative association with introgression found at the population level may be mainly attributed to differences in intrinsic environmental quality of lakes ( e.g . fishing pressure, availability of food resources, abiotic characteristics).