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Auteur (up) Aires, T.; Moalic, Y.; Serrao, E.A.; Arnaud-Haond, S.
Titre Hologenome theory supported by cooccurrence networks of species-specific bacterial communities in siphonous algae (Caulerpa) Type Article scientifique
Année 2015 Publication Revue Abrégée FEMS Microbiology Ecology
Volume 91 Numéro 7 Pages fiv067
Mots-Clés
Résumé The siphonous algae of the Caulerpa genus harbor internal microbial communities hypothesized to play important roles in development, defense and metabolic activities of the host. Here, we characterize the endophytic bacterial community of four Caulerpa taxa in the Mediterranean Sea, through 16S rRNA amplicon sequencing. Results reveal a striking alpha diversity of the bacterial communities, similar to levels found in sponges and coral holobionts. These comprise (1) a very small core community shared across all hosts (< 1% of the total community), (2) a variable portion (ca. 25%) shared by some Caulerpa taxa but not by all, which might represent environmentally acquired bacteria and (3) a large (>70%) species-specific fraction of the community, forming very specific clusters revealed by modularity in networks of cooccurrence, even in areas where distinct Caulerpa taxa occurred in sympatry. Indirect inferences based on sequence homology suggest that these communities may play an important role in the metabolism of their host, in particular on their ability to grow on anoxic sediment. These findings support the hologenome theory and the need for a holistic framework in ecological and evolutionary studies of these holobionts that frequently become invasive.
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ISSN 1574-6941 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1407
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Auteur (up) Auguet, J.C.; Casamayor, E.O.
Titre Partitioning of Thaumarchaeota populations along environmental gradients in high mountain lakes Type Article scientifique
Année 2013 Publication Revue Abrégée FEMS Microbiology Ecology
Volume 84 Numéro 1 Pages 154-164
Mots-Clés amoA gene Euryarchaeota Freshwater Nitrogen Plankton SAGMGC
Résumé We investigated the spatial distribution and diversity of ammonia-oxidizing Archaea (AOA) across gradients of pH, trophic status and altitude in a set of high mountain lakes (Limnological Observatory of the Pyrenees, north-east Spain). Both phylogeny- and taxonomy-based approaches revealed well-defined AOA community patterns with pH as the main potential driving environmental factor. The I.1a and SAGMGC-1 Thaumarchaeota clusters, and their potentially associated amoA gene variants (clusters Fresh 5 and Soil/Fresh 1, respectively) showed highest relative abundances in the most oligotrophic lakes. Euryarchaeota (i.e. HV-Fresh cluster, Methanomicrobiales and Thermoplasmatales) dominated in lakes with higher trophic status. Phylogenetic diversity (PD) in Pyrenean lakes was 1.5- to 2.3-fold higher than the PD from an equivalent number of globally distributed marine and soil sites. We observed segregated distributions for SAGMGC-1, preferentially distributed in the lakes with the lowest pH (< 5) and the highest nitrite concentration (> 0.12 μm), and I.1a in lakes with lower nitrite and dissolved organic carbon concentrations below 0.5 mg L-1. Overall, these results showed strong selection by local environmental conditions, unveiled new ecological niches for freshwater SAGMGC-1 in low pH oligotrophic lakes, and suggested specific and successful adaptations of planktonic archaea to the high mountain lakes landscape. © 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1309
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Auteur (up) Bettarel, Y.; Bouvier, T.; Bouvier, C.; Carré, C.; Desnues, A.; Domaizon, I.; Jacquet, S.; Robin, A.; Sime-Ngando, T.
Titre Ecological traits of planktonic viruses and prokaryotes along a full-salinity gradient Type Article scientifique
Année 2011 Publication Revue Abrégée FEMS Microbiology Ecology
Volume 76 Numéro 2 Pages 360-372
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 544
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Auteur (up) Catherine, A.; Quiblier, C.; Yepremian, C.; Got, P.; Groleau, A.; Vincon-Leite, B.; Bernard, C.; Troussellier, M.
Titre Collapse of a Planktothrix agardhii perennial bloom and microcystin dynamics in response to reduced phosphate concentrations in a temperate lake Type Article scientifique
Année 2008 Publication Revue Abrégée Fems Microbiology Ecology
Volume 65 Numéro 1 Pages 61-73
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ISSN 0168-6496 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 472
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Auteur (up) Chiarello, M.; Villeger, S.; Bouvier, C.; Bettarel, Y.; Bouvier, T.
Titre High diversity of skin-associated bacterial communities of marine fishes is promoted by their high variability among body parts, individuals and species Type Article scientifique
Année 2015 Publication Revue Abrégée FEMS Microbiology Ecology
Volume Numéro Pages fiv061
Mots-Clés
Résumé Animal-associated microbiota of animals form complex communities, which are suspected to play crucial functions for their host fitness. However, the biodiversity of these communities, including their differences between host species and individuals, have been scarcely studied, especially in case of skin-associated communities. In addition, the intra-individual variability (i.e. between body parts) has never been assessed to date. The objective of this study was to characterize skin bacterial communities of two teleostean fish species, namely the European seabass (Dicentrarchus labrax) and gilthead seabream (Sparus aurata), using a high-throughput DNA sequencing method. In order to focus on intrinsic factors of host-associated bacterial community variability, individuals of the two species were raised in controlled conditions. Bacterial diversity was assessed using a set of four complementary indices, describing the taxonomic and phylogenetic facets of biodiversity and their respective composition (based on presence/absence data) and structure (based on species relative abundances) components. Variability of bacterial diversity was quantified at the interspecific, inter- and intra-individual scales. We demonstrated that fish surfaces host highly diverse bacterial communities, whose composition was very different from that of surrounding bacterioplankton. This high total biodiversity of skin-associated communities was supported by the important variability, between host species, individuals and the different body parts (dorsal, anal, pectoral and caudal fins).
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ISSN 1574-6941 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1321
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