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Provedor de dados:  ArchiMer
País:  France
Título:  Evidence for chemoautotrophic symbiosis in a Mediterranean cold seep clam (Bivalvia : Lucinidae): comparative sequence analysis of bacterial 16S rRNA, APS reductase and RubisCO genes
Autores:  Duperron, Sebastien
Fiala Medioni, Aline
Caprais, Jean-claude
Olu, Karine
Sibuet, Myriam
Data:  2007
Ano:  2007
Palavras-chave:  Eastern Mediterranean
Cold seeps
Sulphide oxidizing bacteria
Resumo:  Symbioses between lucinid clams (Bivalvia: Lucinidae) and autotrophic sulphide-oxidizing bacteria have mainly been studied in shallow coastal species, and information regarding deep-sea species is scarce. Here we study the symbiosis of a clam, resembling Lucinoma kazani, which was recently collected in sediment cores from new cold-seep sites in the vicinity of the Nile deep-sea fan, eastern Mediterranean, at depths ranging from 507 to 1691 m. A dominant bacterial phylotype, related to the sulphide-oxidizing symbiont of Lucinoma aequizonata, was identified in gill tissue by comparative 16S rRNA gene sequence analysis. A second phylotype, related to spirochete sequences, was identified twice in a library of 94 clones. Comparative analyses of gene sequences encoding the APS reductase alpha subunit and ribulose-1,5-bisphosphate carboxylase oxygenase support the hypothesis that the dominant symbiont can perform sulphide oxidation and autotrophy. Transmission electron micrographs of gills confirmed the dominance of sulphide-oxidizing bacteria, which display typical vacuoles, and delta C-13 values measured in gill and foot tissue further support the hypothesis for a chemoautotrophic-sourced host carbon nutrition.
Tipo:  Text
Idioma:  Inglês

Editor:  Blackwell science
Formato:  application/pdf
Fonte:  FEMS Microbiology Ecology (0168-6496) (Blackwell science), 2007 , Vol. 59 , N. 1 , P. 64-70
Direitos:  2007 Blackwell Publishing, Inc.

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