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Decker, Carole; Olu, Karine. |
The Hakon Mosby mud volcano (HMMV) is one of the most studied cold-seep sites in Europe. Its exceptional fluid expulsion activity and large geochemical gradients from the centre to the periphery support dense biological communities and induce spatial heterogeneity in microbial activity and faunal zonation. At this site, the macrofauna has been little studied and the variability in its macrobenthic nutrition has not yet been investigated. In this study, based on the analysis of the stable isotopes of carbon and nitrogen, we determined nutritional patterns for macrofauna communities in three different habitats (microbial mats, sediment adjacent to the mat and Siboglinidae polychaete fields). delta C-13 values of macrofaunal tissues varied among two habitats... |
Tipo: Text |
Palavras-chave: Cold seep; Hakon Mosby; Macrofaunal nutrition; Stable isotope analysis. |
Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00019/13043/10161.pdf |
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Decker, Carole; Olu, Karine. |
The relative contribution of chemosynthesis in heterotrophic fauna at seeps is known to be influenced by depth and by habitat. Using stable isotopes of carbon and nitrogen, we investigated macro- and megafaunal nutritional patterns in Norwegian margin cold seeps by comparing food webs both among habitats within a seep site and between different sites. The very active Håkon Mosby mud volcano (HMMV) is characterized by geochemical gradients, microbial activity and faunal zonation from the centre to the periphery. The Storegga Slide (600–900 m depth) has pockmarks with patchy less active seeps, and also shows concentric zonation of habitats but at much smaller spatial scale. The dominant carbon source for macrofaunal nutrition in both areas was... |
Tipo: Text |
Palavras-chave: Cold-seep; Macrofaunal nutrition; Methane-derived carbon; Norwegian margin; Stable isotope analysis. |
Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00074/18518/16164.pdf |
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