Hybridation naturelle entre les anguilles américaines et européennes : ampleur, répartition et stades de vie

Authors: Albert, Vicky
Advisor: Bernatchez, Louis
Abstract: Since only few studies have evaluated fitness beyond the first hybrid generation, the evolutionary processes as well as the potential outcome of natural hybridization remain largely unexplored in animals. Knowing that hybridization occurs between American and European eels (Anguilla rostrata and A. anguilla), this study aimed at documenting the dynamics of natural hybridization in order to better understand its potential evolutionary impact for the two species. AFLP genotypes of 1127 eels were used to identify hybrid individuals and evaluate dynamics of hybridization. Results provide evidence for i) an overall hybrid proportion of 15.5% in Iceland, ii) the occurrence of viable later generation hybrids, iii) a higher proportion of hybrids in the yellow eel samples, and iv) quasiexclusive distribution of hybrids in Iceland where they tend to increase in proportion with latitude. This study thus demonstrates that natural hybridization can have an influence on evolutionary processes in animals and should be considered more formally.
Document Type: Mémoire de maîtrise
Issue Date: 2005
Open Access Date: 12 April 2018
Permalink: http://hdl.handle.net/20.500.11794/18743
Grantor: Université Laval
Collection:Thèses et mémoires

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