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Influences of geothermal sulfur bacteria on a tropical coastal food web ArchiMer
Pascal, Pierre-yves; Dubois, Stanislas; Goffette, Anais; Lepoint, Gilles.
The activity of the geothermal plant at Bouillante in Guadeloupe (French West Indies) releases thioautotrophic bacteria into the coastal environment. Fish counts reveal that fish abundance increases with higher availability of this bacterial resource. In order to evaluate the trophic role of these bacteria, isotopic compositions (C, N, S) of potential consumers were evaluated on transects at increasing distance from the source of bacteria. The 3 mobile fish species examined (Abudefduf saxatilis, Acanthurus bahianus, and Stegastes partitus) ingested and assimilated chemosynthetic bacteria. Similarly, the isotopic composition of the mobile sea urchin Diadema antillarum was different close to the discharge channel, suggesting a diet mainly composed of sulfur...
Tipo: Text Palavras-chave: Shallow vent; Food web; Sulfur bacteria; Stable isotope.
Ano: 2017 URL:
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