FN Archimer Export Format PT J TI Preliminary biological characterization of the Saldanha hydrothermal field at the Mid-Atlantic Ridge (36 degrees 34 ' N, 32 degrees 26 ' W, 2200 m) BT AF BISCOITO, M ALMEIDA, A SEGONZAC, Michel AS 1:1;2:2;3:3; FF 1:;2:;3:PDG-DOP-DCB-EEP-LEP; C1 IMAR, Estacao Biol Marinha Funchal, P-9000107 Madeira, Portugal. Univ Lisbon, Fac Ciencias, DBA, Lab Maritimo Guia,IMAR, P-2750642 Cascais, Portugal. IFREMER, Ctr Brest, DEEP, F-29280 Plouzane, France. C2 IMAR, PORTUGAL UNIV LISBON, PORTUGAL IFREMER, FRANCE SI BREST SE PDG-DOP-DCB-EEP-LEP IN WOS Ifremer jusqu'en 2018 copubli-europe IF 0.492 TC 2 UR https://archimer.ifremer.fr/doc/2006/publication-3610.pdf LA English DT Article DE ;New records;Antimora;Acanthonus;Fish;Sponge;Bathyal megafauna;Gastropoda;Fauna assemblage;Mid Atlantic Ridge;Hydrothermal vents AB A preliminary description of the biology of the Saldanha hydrothermal field in the Mid-Atlantic Ridge (36 degrees 34'N, 32 degrees 26'W, 2200 m) is given, based on direct observation, video images and samples. Venting occurs mainly in a diffuse way through sediment, but hydrothermal fluid discharges are visible through centimeter-long orifices, scattered on the sediment, over an area of approximately 400 m(2), at depths between 2,200 and 2,220 metres. Emitted fluids are transparent, with a temperature of 7-9 degrees C. An almost complete absence of macro- and megafauna around the venting orifices was found. The only vent invertebrate identified was the gastropod Phymorhynchus sp., with only two juvenile specimens caught. A careful examination of the images taken at these orifices showed bacteria-like filaments undulating with fluid discharge. At the level of the benthic bathyal megafauna the dominant species seemed to be the sponge Cinachyra sp. (Demospongiae, Spirophorida, Tetillidae). At least 4 species of fish are new records from the area. PY 2006 PD DEC SO Cahiers de Biologie Marine SN 0007-9723 PU Station Biologique de Roscoff VL 47 IS 4 UT 000243751300015 BP 421 EP 427 ID 3610 ER EF