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Auteur Brauer, V.S.; Stomp, M.; Bouvier, T.; Fouilland, E.; Leboulanger, C.; Confurius-Guns, V.; Weissing, F.J.; Stal, L.J.; Huisman, J. url  doi
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  Titre Competition and facilitation between the marine nitrogen-fixing cyanobacteriunn Cyanothece and its associated bacterial community Type Article scientifique
  Année 2015 Publication Frontiers in Microbiology Revue Abrégée  
  Volume 5 Numéro Pages  
  Mots-Clés aerobic anoxygenic phototrophs; cyanobacteria; heterotrophic bacteria; microbiota; nitrogen fixation; Phytoplankton; resource competition; species interactions  
  Résumé N-2-fixing cyanobacteria represent a major source of new nitrogen and carbon for marine microbial communities, but little is known about their ecological interactions with associated microbiota. In this study we investigated the interactions between the unicellular N-2-fixing cyanobacterium Cyanothece sp. Miami BG043511 and its associated free-living chemotrophic bacteria at different concentrations of nitrate and dissolved organic carbon and different temperatures. High temperature strongly stimulated the growth of Cyanothece, but had less effect on the growth and community composition of the chemotrophic bacteria. Conversely, nitrate and carbon addition did not significantly increase the abundance of Cyanothece, but strongly affected the abundance and species composition of the associated chemotrophic bacteria. In nitrate-free medium the associated bacterial community was co-dominated by the putative diazotroph Mesorhizobium and the putative aerobic anoxygenic phototroph Erythrobacter and after addition of organic carbon also by the Flavobacterium Muricauda. Addition of nitrate shifted the composition toward co-dominance by Erythrobacter and the Gammaproteobacterium Marinobacter. Our results indicate that Cyanothece modified the species composition of its associated bacteria through a combination of competition and facilitation. Furthermore, within the bacterial community, niche differentiation appeared to play an important role, contributing to the coexistence of a variety of different functional groups. An important implication of these findings is that changes in nitrogen and carbon availability due to, e.g., eutrophication and climate change are likely to have a major impact on the species composition of the bacterial community associated with N-2-fixing cyanobacteria.  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1101  
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Auteur Chiarello, M.; Auguet, J.-C.; Bettarel, Y.; Bouvier, C.; Claverie, T.; Graham, N.A.J.; Rieuvilleneuve, F.; Sucre, E.; Bouvier, T.; Villeger, S. doi  openurl
  Titre Skin microbiome of coral reef fish is highly variable and driven by host phylogeny and diet Type Article scientifique
  Année 2018 Publication Revue Abrégée Microbiome  
  Volume 6 Numéro Pages 147  
  Mots-Clés bacterial communities; divergence; diversity; evolution; insights; life-history; Microbiota; mucus; patterns; Phylogenetic diversity; Phylogenetic signal; Phylosymbiosis; sequence data; Teleost; Tropical; vulnerability  
  Résumé Background: The surface of marine animals is covered by abundant and diversified microbial communities, which have major roles for the health of their host While such microbiomes have been deeply examined in marine invertebrates such as corals and sponges, the microbiomes living on marine vertebrates have received less attention. Specifically, the diversity of these microbiomes, their variability among species, and their drivers are still mostly unknown, especially among the fish species living on coral reefs that contribute to key ecosystem services while they are increasingly affected by human activities. Here, we investigated these knowledge gaps analyzing the skin microbiome of 138 fish individuals belonging to 44 coral reef fish species living in the same area. Results: Prokaryotic communities living on the skin of coral reef fishes are highly diverse, with on average more than 600 OTUs per fish, and differ from planktonic microbes. Skin microbiomes varied between fish individual and species, and interspecific differences were slightly coupled to the phylogenetic affiliation of the host and its ecological traits. Conclusions: These results highlight that coral reef biodiversity is greater than previously appreciated, since the high diversity of macro-organisms supports a highly diversified microbial community. This suggest that beyond the loss of coral reefs-associated macroscopic species, anthropic activities on coral reefs could also lead to a loss of still unexplored host-associated microbial diversity, which urgently needs to be assessed.  
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  Langue English Langue du Résumé Titre Original  
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  Volume de collection Numéro de collection Edition  
  ISSN 2049-2618 ISBN Médium  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 2421  
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Auteur Chiarello, M.; Auguet, J.-C.; Graham, N.A.J.; Claverie, T.; Sucre, E.; Bouvier, C.; Rieuvilleneuve, F.; Restrepo-Ortiz, C.X.; Bettarel, Y.; Villeger, S.; Bouvier, T. doi  openurl
  Titre Exceptional but vulnerable microbial diversity in coral reef animal surface microbiomes Type Article scientifique
  Année 2020 Publication Revue Abrégée Proc. R. Soc. B-Biol. Sci.  
  Volume 287 Numéro 1927 Pages 20200642  
  Mots-Clés habitat; fish; conservation; phylogenetic diversity; health; index; communities; evenness; marine biodiversity; mayotte; Octocorallia; Scleratinia; skin microbiota; susceptibility; synechococcus  
  Résumé Coral reefs host hundreds of thousands of animal species that are increasingly threatened by anthropogenic disturbances. These animals host microbial communities at their surface, playing crucial roles for their fitness. However, the diversity of such microbiomes is mostly described in a few coral species and still poorly defined in other invertebrates and vertebrates. Given the diversity of animal microbiomes, and the diversity of host species inhabiting coral reefs, the contribution of such microbiomes to the total microbial diversity of coral reefs could be important, yet potentially vulnerable to the loss of animal species. Analysis of the surface microbiome from 74 taxa, including teleost fishes, hard and soft corals, crustaceans, echinoderms, bivalves and sponges, revealed that more than 90% of their prokaryotic phylogenetic richness was specific and not recovered in surrounding plankton. Estimate of the total richness associated with coral reef animal surface microbiomes reached up to 2.5% of current estimates of Earth prokaryotic diversity. Therefore, coral reef animal surfaces should be recognized as a hotspot of marine microbial diversity. Loss of the most vulnerable reef animals expected under present-day scenarios of reef degradation would induce an erosion of 28% of the prokaryotic richness, with unknown consequences on coral reef ecosystem functioning.  
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  Langue English Langue du Résumé Titre Original  
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  Volume de collection Numéro de collection Edition  
  ISSN 0962-8452 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000536677500005 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2908  
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Auteur Pérez-Pascual, D.; Estellé, J.; Dutto, G.; Rodde, C.; Bernardet, J.-F.; Marchand, Y.; Duchaud, E.; Przybyla, C.; Ghigo, J.-M. url  doi
openurl 
  Titre Growth Performance and Adaptability of European Sea Bass (Dicentrarchus labrax) Gut Microbiota to Alternative Diets Free of Fish Products Type Article scientifique
  Année 2020 Publication Revue Abrégée Microorganisms  
  Volume 8 Numéro 9 Pages 1346  
  Mots-Clés bacteria; European sea bass; fish gut microbiota  
  Résumé Innovative fish diets made of terrestrial plants supplemented with sustainable protein sources free of fish-derived proteins could contribute to reducing the environmental impact of the farmed fish industry. However, such alternative diets may influence fish gut microbial community, health, and, ultimately, growth performance. Here, we developed five fish feed formulas composed of terrestrial plant-based nutrients, in which fish-derived proteins were substituted with sustainable protein sources, including insect larvae, cyanobacteria, yeast, or recycled processed poultry protein. We then analyzed the growth performance of European sea bass (Dicentrarchus labrax L.) and the evolution of gut microbiota of fish fed the five formulations. We showed that replacement of 15% protein of a vegetal formulation by insect or yeast proteins led to a significantly higher fish growth performance and feed intake when compared with the full vegetal formulation, with feed conversion ratio similar to a commercial diet. 16S rRNA gene sequencing monitoring of the sea bass gut microbial community showed a predominance of Proteobacteria, Firmicutes, Actinobacteria, and Bacteroidetes phyla. The partial replacement of protein source in fish diets was not associated with significant differences on gut microbial richness. Overall, our study highlights the adaptability of European sea bass gut microbiota composition to changes in fish diet and identifies promising alternative protein sources for sustainable aquafeeds with terrestrial vegetal complements.  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2833  
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