Change in individual growth rate and its link to gill-net fishing in two sympatric whitefish species

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Etat: Public
Version: Author's accepted manuscript
ID Serval
serval:BIB_194BA52D83FA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Change in individual growth rate and its link to gill-net fishing in two sympatric whitefish species
Périodique
Evolutionary Ecology
Auteur⸱e⸱s
Nusslé S., Bréchon A., Wedekind C.
ISSN
0269-7653
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
25
Numéro
3
Pages
681-693
Langue
anglais
Résumé
Size-selective fishing is expected to affect traits such as individual growth rate, but the relationship between the fishery-linked selection differentials and the corresponding phenotypic changes is not well understood. We analysed a 25-year monitoring survey of sympatric populations of the two Alpine whitefish Coregonus albellus and C. fatioi. We determined the fishing-induced selection differentials on growth rates, the actual change of growth rates over time, and potential indicators of reproductive strategies that may change over time. We found marked declines in adult growth rate and significant selection differentials that may partly explain the observed declines. However, when comparing the two sympatric species, the selection differentials on adult growth were stronger in C. albellus while the decline in adult growth rate seemed more pronounced in C. fatioi. Moreover, the selection differential on juvenile growth was significant in C. albellus but not in C. fatioi, while a significant reduction in juvenile growth over the last 25 years was only found in C. fatioi. Our results suggest that size-selective fishing affects the genetics for individual growth in these whitefish, and that the link between selection differentials and phenotypic changes is influenced by species-specific factors.
Mots-clé
Rapid evolution, Artificial selection, Salmonid, Coregonus, Selection differential, Lake Brienz (Switzerland)
Web of science
Création de la notice
17/07/2010 17:09
Dernière modification de la notice
20/08/2019 13:50
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