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| Titel |
Influence of CH4 and H2S availability on symbiont distribution, carbon assimilation and transfer in the dual symbiotic vent mussel Bathymodiolus azoricus |
| VerfasserIn |
V. Riou, S. Halary, S. Duperron, S. Bouillon, M. Elskens, R. Bettencourt, R. S. Santos, F. Dehairs, A. Colaço |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 6 ; Nr. 5, no. 6 (2008-12-11), S.1681-1691 |
| Datensatznummer |
250002933
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| Publikation (Nr.) |
 copernicus.org/bg-5-1681-2008.pdf |
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| Zusammenfassung |
| High densities of mussels of the genus Bathymodiolus are present at hydrothermal vents of
the Mid-Atlantic Ridge. It was previously proposed that the chemistry at vent
sites would affect their sulphide- and methane-oxidizing endosymbionts'
abundance. In this study, we confirmed the latter assumption using
fluorescence in situ hybridization on Bathymodiolus azoricus specimens maintained in a controlled
laboratory environment at atmospheric pressure with one, both or none of the
chemical substrates. A high level of symbiosis plasticity was observed,
methane-oxidizers occupying between 4 and 39% of total bacterial area
and both symbionts developing according to the presence or absence of their
substrates. Using H13CO3− in the presence of sulphide, or
13CH4, we monitored carbon assimilation by the endosymbionts and
its translocation to symbiont-free mussel tissues. Carbon was incorporated
from methane and sulphide-oxidized inorganic carbon at rates 3 to 10 times
slower in the host muscle tissue than in the symbiont-containing gill
tissue. Both symbionts thus contribute actively to B. azoricus nutrition and adapt to
the availability of their substrates. Further experiments with varying
substrate concentrations using the same set-up should provide useful tools
to study and even model the effects of changes in hydrothermal fluids on B. azoricus'
chemosynthetic nutrition. |
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