Respiration of bivalves from three different deep-sea areas: cold seeps, hydrothermal vents and organic carbon-rich sediments

Type Article
Date 2017-08
Language English
Author(s) Khripounoff AlexisORCID1, Caprais Jean-Claude1, Decker Carole1, Le Bruchec J.1, Noel Philippe1, Husson Berengere1
Affiliation(s) 1 : IFREMER, Ctr Brest, Dept REM EEP LEP, CS 10070, F-29280 Plouzane, France.
Source Deep-sea Research Part Ii-topical Studies In Oceanography (0967-0645) (Pergamon-elsevier Science Ltd), 2017-08 , Vol. 142 , P. 233-243
DOI 10.1016/j.dsr2.2016.05.023
WOS© Times Cited 6
Keyword(s) Deep-sea, Benthic chamber, Vesicomyid and Mytilid bivalves, Respiration rate, Cold seep, Hydrothermal vent
Abstract We studied bivalves (vesicomyids and mytilids) inhabiting four different areas of high sulfide and methane production: 1) in the Gulf of Guinea, two pockmarks (650 m and 3150 m depth) and one site rich in organic sediments in the deepest zone (4950 m average depth), 2) at the Azores Triple Junction on the Mid-Atlantic Ridge, one hydrothermal site (Lucky Strike vent field, 1700 m depth). Two types of Calmar benthic chambers were deployed, either directly set into the sediment (standard Calmar chamber) or fitted with a tank to isolate organisms from the sediment (modified Calmar chamber), to assess gas and solute exchanges in relation to bivalve bed metabolism. Fluxes of oxygen, total carbon dioxide, ammonium and methane were measured. At the site with organic-rich sediments, oxygen consumption by clams measured in situ with the standard benthic chamber was variable (1.3-6.7 mmol m−2 h−1) as was total carbon dioxide production (1-9.6 mmol m−2 h−1). The observed gas and solute fluxes were attributed primarily to bivalve respiration (vesicomyids or mytilids), but microbial and geochemical processes in the sediment may be also responsible for some of variations in the deepest stations. The respiration rate of isolated vesicomyids (16.1-.25.7 µmol g−1dry weight h−1) was always lower than that of mytilids (33 µmol g−1dry weight h−1). This difference was attributed to the presence of a commensal scaleworm in the mytilids. The respiratory coefficient (QR) ≥1 indicated high levels of anaerobic metabolism. The O:N index ranged from 5 to 25, confirming that vesicomyids and mytilids, living in symbiosis with bacteria, have a protein-based food diet.
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Khripounoff Alexis, Caprais Jean-Claude, Decker Carole, Le Bruchec J., Noel Philippe, Husson Berengere (2017). Respiration of bivalves from three different deep-sea areas: cold seeps, hydrothermal vents and organic carbon-rich sediments. Deep-sea Research Part Ii-topical Studies In Oceanography, 142, 233-243. Publisher's official version : https://doi.org/10.1016/j.dsr2.2016.05.023 , Open Access version : https://archimer.ifremer.fr/doc/00341/45204/