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Auteur Tournois, J.; Darnaude, A.M.; Ferraton, F.; Aliaume, C.; Mercier, L.; McKenzie, D.J. url  doi
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  Titre Lagoon nurseries make a major contribution to adult populations of a highly prized coastal fish Type Article scientifique
  Année 2017 Publication Revue Abrégée Limnol. Oceanogr.  
  Volume 62 Numéro 3 Pages 1219-1233  
  Mots-Clés (up)  
  Résumé This study investigated the contributions of five putative nursery areas, namely four coastal lagoons and the marine coastal zone, to the local offshore fishery of the gilthead sea bream Sparus aurata, in the Gulf of Lion (NW Mediterranean). A detailed database of multi-elemental lagoon and marine otolith signatures was developed, based upon analysis of multiple sequential spots across growth bands of the otoliths of juveniles (n = 142) sampled from the habitats over a 5-yr interval. Adults of 10 annual cohorts (n = 114), fished throughout the Gulf, were then submitted to a similar microchemical analysis of the growth band of their otoliths that was formed after nursery settlement in their first year. Using the juvenile signature database and Random Forest classification algorithms, adults were re-assigned to the lagoons or marine coastal zone as a nursery. More than 80% of adults derived from lagoons, being ≥ 85.0% for five consecutive cohorts. Therefore, the marine coastal zone apparently contributed few adults, especially as a function of surface area. The four lagoons differed, however, in their contribution to the S. aurata fishery. Two lagoons qualified as “Effective Juvenile Habitats” that contributed more than 20% of the adults fished. Two shallow brackish lagoons were “Nursery-Role Habitats” that contributed almost twice as many adults, per unit surface area, as the overall average. Such information can support strategies for sustainable management of multiple coastal lagoon habitats, and of valuable fisheries that depend upon them.  
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  ISSN 1939-5590 ISBN Médium  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 2133  
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Auteur Tolotti, M.; Bauer, R.; Forget, F.; Bach, P.; Dagorn, L.; Travassos, P. url  doi
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  Titre Fine-scale vertical movements of oceanic whitetip sharks (Carcharhinus longimanus) Type Article scientifique
  Année 2017 Publication Revue Abrégée Fishery Bulletin  
  Volume 115 Numéro 3 Pages 380-395  
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  Langue Langue du Résumé Titre Original  
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  Volume de collection Numéro de collection Edition  
  ISSN 0090-0656 ISBN Médium  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2146  
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Auteur Troussellier, M.; Escalas, A.; Bouvier, T.; Mouillot, D. doi  openurl
  Titre Sustaining Rare Marine Microorganisms: Macroorganisms As Repositories and Dispersal Agents of Microbial Diversity Type Article scientifique
  Année 2017 Publication Revue Abrégée Frontiers in Microbiology  
  Volume 8 Numéro Pages 947  
  Mots-Clés (up)  
  Résumé Recent analyses revealed that most of the biodiversity observed in marine microbial communities is represented by organisms with low abundance but, nonetheless essential for ecosystem dynamics and processes across both temporal and spatial scales. Surprisingly, few studies have considered the effect of macroorganism-microbe interactions on the ecology and distribution dynamics of rare microbial taxa. In this review, we synthesize several lines of evidence that these relationships cannot be neglected any longer. First, we provide empirical support that the microbiota of macroorganisms represents a significant part of marine bacterial biodiversity and that host-microbe interactions benefit to certain microbial populations which are part of the rare biosphere (i.e., opportunistic copiotrophic organisms). Second, we reveal the major role that macroorganisms may have on the dispersal and the geographic distribution of microbes. Third, we introduce an innovative and integrated view of the interactions between microbes and macroorganisms, namely sustaining the rares, which suggests that macroorganisms favor the maintenance of marine microbial diversity and are involved in the regulation of its richness and dynamics. Finally, we show how this hypothesis complements existing theories in microbial ecology and offers new perspectives about the importance of macroorganisms for the microbial biosphere, particularly the rare members.  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 2156  
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Auteur Assali, C.; Bez, N.; Tremblay, Y. url  doi
openurl 
  Titre Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters Type Article scientifique
  Année 2017 Publication Revue Abrégée Scientific Reports  
  Volume 7 Numéro 1 Pages 7364  
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  Résumé Seabirds are known to concentrate on prey patches or at predators aggregations standing for potential feeding opportunities. They may search for prey using olfaction or by detecting visually feeding con-specifics and sub-surface predators, or even boats. Thus, they might form a foraging network. We hypothesized that conditionally to the existence of a foraging network, the visual detection ability of seabirds should have a bearing on their medium-scale distribution at sea. Using a fishing-boat radar to catch the instantaneous distribution of seabirds groups within 30 km around the vessel, we conducted a spatial clustering of the seabird-echoes. We found 7,657 clusters (i.e. aggregations of echoes), lasting less than 15 minutes and measuring 9.2 km in maximum length (median). Distances between seabirds groups within clusters showed little variation (median: 2.1 km; CV: 0.5), while area varied largely (median: 21.9 km2; CV: 0.8). Given existing data on seabirds’ reaction distances to boats or other marine predators, we suggest that these structures may represent active foraging sequences of seabirds spreading themselves in space such as to possibly cue on each others. These seabird clusters were not previously described and are size compatible with the existence of a foraging network.  
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  ISSN 2045-2322 ISBN Médium  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2182  
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Auteur Lagarde, F.; ROQUE D'ORBCASTEL, E.; Ubertini, M.; Mortreux, S.; Bernard, I.; Fiandrino, A.; Chiantella, C.; Bec, B.; Roques, C.; Bonnet, D.; Miron, G.; Richard, M.; Pouvreau, S.; Lett C. url  doi
openurl 
  Titre Recruitment of the Pacific oyster Crassostrea gigas in a shellfish-exploited Mediterranean lagoon: discovery, driving factors and a favorable environmental window Type Article scientifique
  Année 2017 Publication Revue Abrégée Mar Ecol Prog Ser  
  Volume 578 Numéro Pages 1-17  
  Mots-Clés (up)  
  Résumé ABSTRACT: In the context of increasing demand for environmental recovery, aquatic systems may face the challenge of evolving under oligotrophication. This is the case in Mediterranean lagoons, in particular the shellfish-farmed Thau lagoon in France, where we studied recruitment of the Pacific oyster Crassostrea gigas. Oyster spat and environmental parameters were monitored at several sampling sites for 3 yr (2012 to 2014) using an original method with a temporal overlap deployment of collectors to study pre- and post-settlement processes and to identify the best conditions for recruitment. Contrary to the ‘no Pacific oyster reproduction’ paradigm in Mediterranean lagoons, our study showed that recruitment of this introduced species is possible in the Thau lagoon at levels comparable to those in other traditional French breeding basins. We identified a favorable environmental window for recruitment characterized by high water temperature (>26.5°C) and high nanophytoplankton and Chaetoceros spp. abundances (>4.3 × 106 and 345 × 103 cells l-1, respectively). In these favorable conditions, we hypothesize that the ecosystem functions as an autotrophic system, in contrast to the heterotrophic system that characterizes unfavorable conditions. Under heterotrophic conditions, high abundances of mixotrophic and heterotrophic organisms (ciliates and dinoflagellates) limited the metamorphosis of C. gigas larvae, leading to poor recruitment. This study provides new knowledge on the reproduction of the Pacific oyster in a Mediterranean lagoon under warming and oligotrophication. The shellfish industry will profit from the discovery of spatfields to develop new nursery practices that are eco-friendly and limit risks of transfers with other spatfall areas.  
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  Notes <p>10.3354/meps12265</p> Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2184  
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