FN Archimer Export Format PT J TI Chemical environment of the hydrothermal mussel communities in the Lucky Strike and Menez Gwen vent fields, Mid Atlantic ridge OT Environnement chimique des communautés de moules hydrothermales sur les sites Lucky Strike et Menez Gwen, Ride Médio-Atlantique. BT AF SARRADIN, Pierre-Marie CAPRAIS, Jean-Claude RISO, Ricardo KEROUEL, Roger AMINOT, Alain AS 1:1;2:1;3:2;4:1;5:1; FF 1:;2:;3:;4:;5:PDG-DOP-DCB-DYNECO-PELAGOS; C1 IFREMER, Ctr Brest, LEA, EP DRO, F-29280 Plouzane, France. UBO, France C2 IFREMER, FRANCE UBO, FRANCE SI BREST SE PDG-DOP-DCB-DYNECO-PELAGOS IN WOS Ifremer jusqu'en 2018 IF 0.688 TC 93 UR https://archimer.ifremer.fr/doc/00147/25847/23968.pdf LA English DT Article CR DIVANAUT 1 DIVANAUT 2 BO Le Nadir DE ;environment;sea water;hydrothermal vents;mussels AB 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. PY 1999 SO Cahiers De Biologie Marine SN 0007-9723 PU Cahiers De Biologie Marine VL 40 IS 1 UT 000080135700011 BP 93 EP 104 ID 25847 ER EF