Chemical environment of the hydrothermal mussel communities in the Lucky Strike and Menez Gwen vent fields, Mid Atlantic ridge

Other titles Environnement chimique des communautés de moules hydrothermales sur les sites Lucky Strike et Menez Gwen, Ride Médio-Atlantique.
Type Article
Date 1999
Language English
Author(s) Sarradin Pierre-Marie1, Caprais Jean-Claude1, Riso Ricardo2, Kerouel Roger1, Aminot Alain1
Affiliation(s) 1 : IFREMER, Ctr Brest, LEA, EP DRO, F-29280 Plouzane, France.
2 : UBO, France
Source Cahiers De Biologie Marine (0007-9723) (Cahiers De Biologie Marine), 1999 , Vol. 40 , N. 1 , P. 93-104
WOS© Times Cited 89
Keyword(s) environment, sea water, hydrothermal vents, mussels
Abstract Water samples were collected around the communities of a hydrothermal mussel, Bathymodiolus sp., in the Lucky Strike (1700 m depth) and Menez Gwen (850 m depth) areas, Mid Atlantic Ridge, and analysed for chemical constituents. The environment surrounding the organisms consists in sea water (88 to 100%) mixed with hydrothermal fluid with pH between 6.2 and 8, Sigma S (H2S + HS-) concentrations from 0 to 62 mu mol l(-1). High dissolved organic carbon (DOC) concentrations suggest a highly productive ecosystem. Production of ammonium and DOG, consumption of nitrate and sulfide in the vicinity of the organisms are among the environmental changes found in relation with local biological activity. Concentrations of Cu and Pb were high, implying that the organisms need to have efficient strategies of adaptation. An empirical distinction between the extreme sizes of the mussels (> 6 cm and < 3 cm) reveals that the size distribution of the communities is related to the presence of different environments: the large size classes are present closer to the fluid exits, with higher Sigma S concentrations, than the small size classes. This could indicate differences in the growth rate related to the availability of the energy sources, competition for energy and space, and/or different settlement periods.
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Sarradin Pierre-Marie, Caprais Jean-Claude, Riso Ricardo, Kerouel Roger, Aminot Alain (1999). Chemical environment of the hydrothermal mussel communities in the Lucky Strike and Menez Gwen vent fields, Mid Atlantic ridge. Cahiers De Biologie Marine, 40(1), 93-104. Open Access version : https://archimer.ifremer.fr/doc/00147/25847/