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Evidence for limited larval dispersal in black rockfish (Sebastes melanops): implications for population structure and marine-reserve design

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Abstract:

Although dispersal distances of marine larvae influence gene flow and the establishment of population structure, few data on realized dispersal distances exist for marine species. We combined otolith microstructure and micro chemistry of black rockfish (Sebastes melanops) to assess their potential to provide relative estimates of larval dispersal distance. In 2001 and 2002 we measured trace elements at discrete otolith regions, representing the (i) egg/early-larval, (ii) pelagic larval, and (iii) late-larval/early-juvenile periods of fish collected at three locations 120–460 km apart. Discriminant-function analyses based on geochemical signatures at each otolith region accurately grouped an average of 85% (jackknife =  67%) and 87% (jackknife = 81%) of the fish to collection location in 2001 and 2002, respectively. Age at collection ranged from 83 to 174 days and parturition dates within each site were spread over a 22- to 66-day period. Therefore, individuals within sites were not released at similar times. A probable explanation of these data is that larvae from different geographic locations did not mix during ontogeny and possibly did not disperse long distances alongshore. Larval dispersal distances may be appreciably shorter, <120 km, than previously assumed based on models of passive dispersal.

Bien que la distance de dispersion des larves marines affecte le flux des gènes et l'établissement de la structure de population, il existe peu de données sur les distances réelles de dispersion des espèces marines. Nous avons évalué le potentiel d'une étude combinée de la microstructure et de la microchimie des otolithes du sébaste noir (Sebastes melanops) pour estimer les distances de dispersion des larves. En 2001 et 2002, nous avons mesuré les éléments en traces à des points distincts des otolithes, représentant les périodes (i) embryonnaire et larvaire précoce, (ii) larvaire pélagique et (iii) larvaire tardive et juvénile précoce chez des poissons de trois sites distants les uns des autres de 120–460 km. Une analyse des fonctions discriminantes basées sur les signatures géochimiques dans chacune des régions de l'otolithe regroupe correctement 85 % (67 % après un jackknife) des poissons récoltés en 2001 et 87 % (81 % après un jackknife) en 2002. Les âges à la récolte varient de 83 à 174 jours et les dates de ponte à chaque site s'étendent sur une période de 22–66 jours. Les individus ne sont donc pas relâchés simultanément à tous les sites. Une explication probable de ces données est que les larves des différents sites géographiques ne se mêlent pas entre elles au cours de l'ontogénie et qu'elles ne se dispersent probablement pas sur de grandes distances le long du rivage. Les distances de dispersion des larves sont peut-être considérablement plus courtes, soit <120 km, que l'on estimait antérieurement d'après les modèles de dispersion passive.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2004

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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