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| Titel |
Comparative study of vent and seep macrofaunal communities in the Guaymas Basin |
| VerfasserIn |
M. Portail, K. Olu, E. Escobar-Briones, J. C. Caprais, L. Menot, M. Waeles, P. Cruaud, P. M. Sarradin, A. Godfroy, J. Sarrazin |
| 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 ; 12, no. 18 ; Nr. 12, no. 18 (2015-09-21), S.5455-5479 |
| Datensatznummer |
250118099
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| Publikation (Nr.) |
 copernicus.org/bg-12-5455-2015.pdf |
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| Zusammenfassung |
| Understanding the ecological processes and connectivity of chemosynthetic
deep-sea ecosystems requires comparative studies. In the Guaymas Basin (Gulf
of California, Mexico), the presence of seeps and vents in the absence of a
biogeographic barrier, and comparable sedimentary settings and depths offers a
unique opportunity to assess the role of ecosystem-specific environmental
conditions on macrofaunal communities. Six seep and four vent assemblages
were studied, three of which were characterised by common major foundation
taxa: vesicomyid bivalves, siboglinid tubeworms and microbial mats.
Macrofaunal community structure at the family level showed that density,
diversity and composition patterns were primarily shaped by seep- and vent-common abiotic factors including methane and hydrogen sulfide concentrations, whereas vent environmental specificities (higher
temperature, higher metal concentrations and lower pH) were not significant.
The type of substratum and the heterogeneity provided by foundation species
were identified as additional structuring factors and their roles were found
to vary according to fluid regimes. At the family level, seep and vent
similarity reached at least 58 %. All vent families were found at seeps
and each seep-specific family displayed low relative abundances (< 5 %). Moreover, 85 % of the identified species among dominant families
were shared between seep and vent ecosystems. This study provides further
support to the hypothesis of continuity among deep-sea seep and vent
ecosystems. |
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