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Biol Open. 2018 Oct 19;7(10). pii: bio033332. doi: 10.1242/bio.033332.

Hybridization between char species (Salvelinus alpinus and Salvelinus fontinalis): a fast track for novel allometric trajectories.

Author information

1
Département de biologie, chimie et géographie, Université du Québec à Rimouski, 300, Allée des Ursulines, Rimouski, QC, Canada G5L 3A1.
2
Faculté des sciences de l'agriculture et de l'alimentation, Département des sciences animales, Université Laval, Pavillon Paul-Comtois 2425 Rue de l'agriculture Local 1122, Québec, Québec, Canada, G1V 0A6.
3
Biodôme de Montréal, 4777 Avenue Pierre-De Coubertin, Montréal, Québec, Canada H1V 1B3.
4
Département de biologie, chimie et géographie, Université du Québec à Rimouski, 300, Allée des Ursulines, Rimouski, QC, Canada G5L 3A1 pierre_blier@uqar.ca.

Abstract

Hybridization between closely related species can generate genetic and phenotypic variation, providing valuable biological material to assess the physiological impact of the structural or functional variability of different organs. In the present study, we examined growth rates of various organs and whole body in brook char, Arctic char and their reciprocal hybrids over a period of 281 days. Parental species achieved significantly higher body mass than their hybrids. Hybridization significantly reduced the relative size of the heart, liver and spleen. The relative size of pyloric caeca did not differ among the four groups. The observed lower growth performance of the hybrids compared to parental species strongly suggests that divergence in the relative size of digestive organs, liver and heart partly dictate growth capacity. Our results also suggest that the increased variability achieved through hybridization may prove useful in a genetic selection program.

KEYWORDS:

Arctic char; Brook char; Heterosis; Morphometry; Ontogeny; Transgressive segregation

Conflict of interest statement

Competing interestsThe author of this original research had no competing interests to declare. The project was financially supported by the NSERC strategic program. No authors engaged in this research present or anticipated employment by any organization that may gain or lose financially through publication of this paper. In the same way, no authors had or have shares or personal financial investment associated with the project.

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