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Auteur Compte-Port, S.; Borrego, C.M.; Moussard, H.; Jeanbille, M.; Restrepo-Ortiz, C.X.; de Diego, A.; Rodriguez-Iruretagoiena, A.; Gredilla, A.; Fdez-Ortiz de Vallejuelo, S.; Galand, P.E.; Kalenitchenko, D.; Rols, J.-L.; Pokrovsky, O.S.; Gonzalez, A.G.; Camarero, L.; Muniz, S.; Navarro-Navarro, E.; Auguet, J.-C.
Titre Metal contaminations impact archaeal community composition, abundance and function in remote alpine lakes Type Article scientifique
Année 2018 Publication Revue Abrégée Environ. Microbiol.
Volume 20 Numéro 7 Pages 2422-2437
Mots-Clés ammonia-oxidizing archaea; fresh-water lakes; high-altitude lakes; high-mountain lakes; mcra gene; methanogenic archaea; microbial communities; ribosomal-rna; tibetan plateau; trace-metals
Résumé Using the 16S rRNA and mcrA genes, we investigated the composition, abundance and activity of sediment archaeal communities within 18 high-mountain lakes under contrasted metal levels from different origins (bedrock erosion, past-mining activities and atmospheric depositions). Bathyarchaeota, Euryarchaeota and Woesearchaeota were the major phyla found at the meta-community scale, representing 48%, 18.3% and 15.2% of the archaeal community respectively. Metals were equally important as physicochemical variables in explaining the assemblage of archaeal communities and their abundance. Methanogenesis appeared as a process of central importance in the carbon cycle within sediments of alpine lakes as indicated by the absolute abundance of methanogen 16S rRNA and mcrA gene transcripts (10(5) to 10(9) copies g(-1)). We showed that methanogen abundance and activity were significantly reduced with increasing concentrations of Pb and Cd, two indicators of airborne metal contaminations. Considering the ecological importance of methanogenesis in sediment habitats, these metal contaminations may have system wide implications even in remote area such as alpine lakes. Overall, this work was pioneer in integrating the effect of long-range atmospheric depositions on archaeal communities and indicated that metal contamination might significantly compromise the contribution of Archaea to the carbon cycling of the mountain lake sediments.
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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 1462-2912 ISBN Médium
Région Expédition Conférence
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Numéro d'Appel MARBEC @ alain.herve @ collection 2420
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Auteur Espinosa, F.; Rivera-Ingraham, G.A.
Titre Subcellular evidences of redox imbalance in well-established populations of an endangered limpet. Reasons for alarm? Type Article scientifique
Année 2016 Publication Revue Abrégée Mar. Pollut. Bull.
Volume 109 Numéro 1 Pages 72-80
Mots-Clés antioxidant enzymes; community structure; Conservation; different environmental-conditions; Heavy metals; heavy-metals; marine-invertebrates; mussel mytilus-edulis; Oxidative stress; oyster crassostrea-virginica; Patella ferruginea; patella-ferruginea gastropoda; Pollution; trace-metals
Résumé Intertidal species are more vulnerable to anthropogenic disturbances than others inhabiting subtidal and offshore habitats. Coastal development frequently results in trace-metal pollution. For endangered species such as Patella ferruginea it can be a high risk that leads local populations to extinction. Three localities were surveyed, one within a natural and unpolluted area and the other two within the harbor of Ceuta (Strait of Gibraltar), on breakwaters outside and inside. The specimens collected inside the harbor reached 3-fold higher Hg content than for those incoming from the natural area. PERMANOVA test indicated that metal composition of the specimens from inside the harbor was different from the rest. In addition, evidence of cell damage was detected in the specimens from the harbor area. This highlights the urgency of undertaking a physiological evaluation of some of the most vulnerable populations, establishing eco-physiological protocols for monitoring and managing populations settled on artificial substrata. (C) 2016 Elsevier Ltd. All rights reserved.
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Auteur institutionnel Thèse
Editeur Lieu de Publication Éditeur
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 0025-326x ISBN Médium
Région Expédition Conférence
Notes Approuvé pas de
Numéro d'Appel MARBEC @ alain.herve @ collection 1635
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