FN Archimer Export Format
PT J
TI A microbiological and biogeochemical investigation of the cold seep tubeworm Escarpia southwardae (Annelida: Siboglinidae): Symbiosis and trace element composition of the tube
BT 
AF DUPERRON, Sebastien
   GAUDRON, Sylvie M.
   LEMAITRE, Nolwenn
   BAYON, Germain
AS 1:1;2:1;3:2,3,4;4:2;
FF 1:;2:;3:;4:PDG-REM-GM-LGM;
C1 Univ Paris 06, Univ Paris 04, Lab Biol Organismes Aquat & Ecosyst UMR7208, F-75005 Paris, France.
   IFREMER, Unite Rech Geosci, F-29280 Plouzane, France.
   Univ Europeenne Bretagne, F-35000 Rennes, France.
   Univ Bretagne Occidentale, CNRS UMS 3113, Inst Univ Europeen Mer, F-29280 Plouzane, France.
C2 UNIV PARIS 06, FRANCE
   IFREMER, FRANCE
   UNIV RENNES, FRANCE
   UBO, FRANCE
SI BREST
SE IUEM
   PDG-REM-GM-LGM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.566
TC 19
UR https://archimer.ifremer.fr/doc/00191/30251/28683.pdf
LA English
DT Article
CR WACS
BO Pourquoi pas ?
DE ;Sulfur-oxidizing bacteria;rTCA;Trace elements;RubisCO;Symbiosis
AB Tubeworms within the annelid family Siboglinidae rely on sulfur-oxidizing autotrophic bacterial symbionts for their nutrition, and are among the dominant metazoans occurring at deep-sea hydrocarbon seeps. Contrary to their relatives from hydrothermal vents, sulfide uptake for symbionts occurs within the anoxic subsurface sediment, in the posterior ‘root’ region of the animal. This study reports on an integrated microbiological and geochemical investigation of the cold seep tubeworm Escarpia southwardae collected at the Regab pockmark (Gulf of Guinea). Our aim was to further constrain the links between the animal and its symbiotic bacteria, and their environment. We show that E. southwardae harbors abundant sulfur-oxidizing bacterial symbionts in its trophosome. Symbionts are able to fix inorganic carbon using the Calvin-Benson cycle, as reported in most other Siboglinidae, but can also use the reverse Tricarboxilic Acid Cycle. Surprisingly, the observed bacteria appear to be more closely related to symbionts of Escarpia and Lamellibrachia species from very distant sites located in the Gulf of Mexico and eastern Pacific, than to symbionts of a siboglinid occurring at a nearby methane seep site, only a few hundred km away from Regab. Then, by combining scanning electron microscopy and trace element (Mn, Fe, Sr, Zr) analyses of E. southwardae tube, we also show that two distinct oxidation fronts occur along the tube. The first one, near the posterior end of the tube, corresponds to the interface between oxic bottom waters and the underlying anoxic sediment. In contrast, the second redox front is located in the most anterior part of the tube, and could result from active oxygen uptake by the plume of the tubeworm. We speculate that intense oxygen consumption in this region could create favorable conditions for sulfate reduction by specialized bacteria associated with the plume, possibly leading to an additional source of dissolved sulfide that would further enhance the productivity of bacterial symbionts.
PY 2014
PD AUG
SO Deep-sea Research Part I-oceanographic Research Papers
SN 0967-0637
PU Pergamon-elsevier Science Ltd
VL 90
UT 000338978400010
BP 105
EP 114
DI 10.1016/j.dsr.2014.05.006
ID 30251
ER

EF