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Early back-calculated size-at-age of Atlantic yellow eels sampled along ecological gradients in the Gironde and St. Lawrence hydrographical systems

Patey, Géraldine; Couillard, Catherine M.; Drouineau, Hilaire; Verreault, Guy; Pierron, Fabien; Lambert, Patrick; Baudrimont, Magalie; Couture, Patrice (9999). Early back-calculated size-at-age of Atlantic yellow eels sampled along ecological gradients in the Gironde and St. Lawrence hydrographical systems Canadian Journal of Fisheries and Aquatic Sciences . DOI: 10.1139/cjfas-2017-0025. (Sous Presse)

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Résumé

An international sampling program investigating the causes of the decline of American eels (Anguilla rostrata) and European eels (Anguilla anguilla) in the St. Lawrence (Canada) and Gironde (France) rivers systems provided the opportunity to compare early growth of eels of each species among habitats using back-calculated size–at-age from 1 to 5 years old. Our study supports previous studies showing that the early back-calculated lengths of A. anguilla were higher in downstream and more saline Gironde system habitats than in the upstream fluvial section, and provides a new indication that length at 1-year-old is twice higher than that reported 10 years earlier. However, our data contradict the current paradigm for A. rostrata by providing evidence that early size-at-age of eels from the upstream St. Lawrence system, most distant from the spawning area, exceeds those of eels sampled downstream, at less distant sites in the estuarine section. Overall these observations are consistent with the hypothesis that the observed spatial variations in early growth rate of yellow eels sampled in the St. Lawrence and Gironde systems are the consequence of processes occurring in the first year of age such as genetic selection and/or genetically-dependent habitat choice.

Type de document: Article
Mots-clés libres: Anguilla rostrata; Anguilla anguilla; back-calculated length; growth; habitat; St. Lawrence River system; Gironde River system
Centre: Centre Eau Terre Environnement
Date de dépôt: 29 janv. 2018 21:39
Dernière modification: 29 janv. 2018 21:39
URI: http://espace.inrs.ca/id/eprint/6792

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