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Auteur (up) Toledo, P.; Darnaude, A.M.; Niklitschek, E.J.; Ojeda, V.; Voue, R.; Leiva, F.P.; Labonne, M.; Canales-Aguirre, C.B. doi  openurl
  Titre Partial migration and early size of southern hake Merluccius australis: a journey between estuarine and oceanic habitats off Northwest Patagonia Type Article scientifique
  Année 2019 Publication Revue Abrégée ICES J. Mar. Sci.  
  Volume 76 Numéro 4 Pages 1094-1106  
  Mots-Clés age estimation; early size; ecology; evolution; fish otoliths; growth; history; Merluccius australis; nor-Patagonia; otolith microchemistry; otoliths; parameters; partial migration; productivity; stability  
  Résumé Partial migration is a key adaptive strategy, increasingly observed across multiple taxa. To investigate partial migration and life-cycle diversity of Merluccius australis in northwestern Patagonia, we analysed isotopic (delta C-13, delta O-18) and elemental (B-11, Na-23, Mg-24, Mn-55, Sr-86, Ba-138) compositions of otoliths from juveniles, sub-adults, and adults to identify nursery origins, habitats used, and migratory behaviours of multiple cohorts (1990-2005). Influence of early size upon migration was assessed by comparing back-calculated sizes at demersal recruitment between resident and migratory adults. Although partial migration occurred at both estuarine and oceanic nursery habitats, migratory behaviour was more frequent in fish of estuarine origin (59%) than in fish of oceanic origin (17%). Adults of estuarine origin dominated both estuarine (92%) and oceanic (77%) sampling areas. Although we found no significant differences in size at demersal recruitment between oceanic-resident and oceanic-migratory fish, a strong relationship between size at demersal recruitment and migratory behaviour appeared in fish of estuarine origin, whose probability of migration increased from 5% to 95% as demersal recruitment size increased from 18.8 to 23.6cm. Further research on M. australis life cycle is required to incorporate sub-population processes into the stock assessment and management models being used for this overexploited species.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 1054-3139 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000484404900029 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2643  
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