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| Titel |
Chemosymbiotic species from the Gulf of Cadiz (NE Atlantic): distribution, life styles and nutritional patterns |
| VerfasserIn |
C. F. Rodrigues, A. Hilário, M. R. Cunha |
| 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 ; 10, no. 4 ; Nr. 10, no. 4 (2013-04-17), S.2569-2581 |
| Datensatznummer |
250018204
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| Publikation (Nr.) |
 copernicus.org/bg-10-2569-2013.pdf |
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| Zusammenfassung |
| Previous work in the mud volcanoes from the Gulf of Cadiz (South Iberian Margin) revealed a high
number of chemosymbiotic species, namely bivalves and siboglinid
polychaetes. In this study we give an overview of the distribution and life
styles of these species in the Gulf of Cadiz, determine the role of
autotrophic symbionts in the nutrition of selected species using stable
isotope analyses (δ13C, δ15N and δ34S) and investigate the intra-specific variation of isotope
signatures within and between study sites. During our studies, we identified
twenty siboglinidae and nine bivalve chemosymbiotic species living in fifteen
mud volcanoes. Solemyid bivalves and tubeworms of the genus Siboglinum are widespread
in the study area, whereas other species were found in a single mud volcano
(e.g. "Bathymodiolus" mauritanicus) or restricted to deeper mud volcanoes (e.g. Polybrachia sp.,
Lamelisabella denticulata). Species distribution suggests that different species may adjust their
position within the sediment according to their particular needs, and to the
intensity and variability of the chemical substrata supply. Tissue stable
isotope signatures for selected species are in accordance with values found
in other studies, with thiotrophy as the dominant nutritional pathway, and
with methanotrophy and mixotrophy emerging as secondary strategies. The
heterogeneity in terms of nutrient sources (expressed in the high variance
of nitrogen and sulphur values) and the ability to exploit different
resources by the different species may explain the high diversity of
chemosymbiotic species found in the Gulf of Cadiz. This study increases the
knowledge on distributional patterns and resource partitioning of
chemosymbiotic species and highlights how trophic fuelling varies on spatial
scales with direct implications to seep assemblages and potentially to the
biodiversity of continental margin. |
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