Temporal variation of currents, particulate flux and organism supply at two deep-sea hydrothermal fields of the Azores Triple Junction

Type Article
Date 2008-04
Language English
Author(s) Khripounoff AlexisORCID1, Vangriesheim Annick1, Crassous Philippe1, Segonzac Michel1, Lafon V2, Waren A3
Affiliation(s) 1 : IFREMER, DEEP LEP, F-29280 Plouzane, France.
2 : Univ Acores, IMAR DOP, P-9901862 Horta, Azores, Portugal.
3 : Swedish Museum Nat Hist, Dept Invertebrate Zool, SE-10405 Stockholm, Sweden.
Source Deep Sea Research Part I: Oceanographic Research Papers (0967-0637) (Elsevier), 2008-04 , Vol. 55 , N. 4 , P. 532-551
DOI 10.1016/j.dsr.2008.01.001
WOS© Times Cited 25
Keyword(s) Bivalve reproduction, Bivalve larvae, Particle composition, Particle flux, Currents, Deep sea hydrothermal vents
Abstract In order to provide information on the production and the distribution of hydrothermal particulate and biological material produced by deep-sea hydrothermal vents, three moorings with sediment traps and currentmeters were deployed for one year in the Azores Triple Junction region. Two moorings were positioned close to two hydrothermal vent fields at the Mid-Atlantic Ridge (Rainbow, 36 degrees 14'N, 33 degrees 54'W, 2250 in depth and Lucky Strike 37 degrees 17'N, 32 degrees 17'W, 1600 in depth). A third was moored out of the influence of the Rainbow vents representing the reference of the pelagic flux in this area. At the Rainbow field, particulate flux (range 341-634 g m(-2)d(-1)) showed a high temporal variation controlled essentially by the current direction. The particles were characterized by a high concentration of total sulfur (16.4%) and copper (8.6%) and a low concentration of organic carbon (1.4%). Bivalves collected in the trap belonged to the hydrothermal mytilid Bathymodiolus azoricus and were all in the prejuvenile prodissoconch II stage of their development. Their density decreased strongly between July and September, indicating a possible discontinuous reproduction of this species. The particles at Lucky Strike were rich in barium and the calculated flux was lower than at Rainbow (range 52-308 g m(-2) d(-1)) because of the translucent fluid poor in particles emitted at this shallower station. However, a peak in the flux was observed in May corresponding to the seasonal phytoplankton bloom. Two different bivalve species were sampled in this trap. The most abundant was B. azoricus. However, their development stages showed higher variations compared to the Rainbow trap. The abundance of mussels in the trap was very low throughout the year and does not allow one to show significant spawning periodicity. (c) 2008 Elsevier Ltd. All rights reserved.
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Khripounoff Alexis, Vangriesheim Annick, Crassous Philippe, Segonzac Michel, Lafon V, Waren A (2008). Temporal variation of currents, particulate flux and organism supply at two deep-sea hydrothermal fields of the Azores Triple Junction. Deep Sea Research Part I: Oceanographic Research Papers, 55(4), 532-551. Publisher's official version : https://doi.org/10.1016/j.dsr.2008.01.001 , Open Access version : https://archimer.ifremer.fr/doc/00000/4059/