Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales
The Gulf of Cadiz is an extensive seepage area in the south Iberian margin (NE Atlantic) encompassing over 40 mud volcanoes (MVs) at depths ranging from 200 to 4000 m. The area has a long geologic history and a central biogeographic location with a complex circulation ensuring oceanographic connecti...
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ftdoajarticles:oai:doaj.org/article:8adf9227037649169594f66c8020491b 2023-05-15T17:35:47+02:00 Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales M. R. Cunha C. F. Rodrigues L. Génio A. Hilário A. Ravara O. Pfannkuche 2013-04-01T00:00:00Z https://doi.org/10.5194/bg-10-2553-2013 https://doaj.org/article/8adf9227037649169594f66c8020491b EN eng Copernicus Publications http://www.biogeosciences.net/10/2553/2013/bg-10-2553-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-2553-2013 1726-4170 1726-4189 https://doaj.org/article/8adf9227037649169594f66c8020491b Biogeosciences, Vol 10, Iss 4, Pp 2553-2568 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-2553-2013 2022-12-31T12:59:26Z The Gulf of Cadiz is an extensive seepage area in the south Iberian margin (NE Atlantic) encompassing over 40 mud volcanoes (MVs) at depths ranging from 200 to 4000 m. The area has a long geologic history and a central biogeographic location with a complex circulation ensuring oceanographic connectivity with the Mediterranean Sea, equatorial and North Atlantic regions. The geodynamics of the region promotes a notorious diversity in the seep regime despite the relatively low fluxes of hydrocarbon-rich gases. We analyse quantitative samples taken during the cruises TTR14, TTR15 and MSM01-03 in seven mud volcanoes grouped into Shallow MVs (Mercator: 350 m, Kidd: 500 m, Meknès: 700 m) and Deep MVs (Captain Arutyunov: 1300 m, Carlos Ribeiro: 2200 m, Bonjardim: 3000 m, Porto: 3900 m) and two additional Reference sites (ca. 550 m). Macrofauna (retained by a 500 μm sieve) was identified to species level whenever possible. The samples yielded modest abundances (70–1567 individuals per 0.25 m 2 ), but the local and regional number of species is among the highest ever reported for cold seeps. Among the 366 recorded species, 22 were symbiont-hosting bivalves (Thyasiridae, Vesicomyidae, Solemyidae) and tubeworms (Siboglinidae). The multivariate analyses supported the significant differences between Shallow and Deep MVs: The environmental conditions at the Shallow MVs make them highly permeable to the penetration of background fauna leading to high diversity of the attendant assemblages ( H ′: 2.92–3.94; ES (100) : 28.3–45.0; J ′: 0.685–0.881). The Deep MV assemblages showed, in general, contrasting features but were more heterogeneous ( H ′: 1.41–3.06; ES (100) : 10.5–30.5; J ′: 0.340–0.852) and often dominated by one or more siboglinid species. The rarefaction curves confirmed the differences in biodiversity of Deep and Shallow MVs as well as the convergence of the latter to the Reference sites. The Bray–Curtis dissimilarity demonstrated the high β-diversity of the assemblages, especially in pairwise comparisons involving ... Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Bray ENVELOPE(-114.067,-114.067,-74.833,-74.833) Kidd ENVELOPE(-65.972,-65.972,-66.448,-66.448) Biogeosciences 10 4 2553 2568 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. R. Cunha C. F. Rodrigues L. Génio A. Hilário A. Ravara O. Pfannkuche Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The Gulf of Cadiz is an extensive seepage area in the south Iberian margin (NE Atlantic) encompassing over 40 mud volcanoes (MVs) at depths ranging from 200 to 4000 m. The area has a long geologic history and a central biogeographic location with a complex circulation ensuring oceanographic connectivity with the Mediterranean Sea, equatorial and North Atlantic regions. The geodynamics of the region promotes a notorious diversity in the seep regime despite the relatively low fluxes of hydrocarbon-rich gases. We analyse quantitative samples taken during the cruises TTR14, TTR15 and MSM01-03 in seven mud volcanoes grouped into Shallow MVs (Mercator: 350 m, Kidd: 500 m, Meknès: 700 m) and Deep MVs (Captain Arutyunov: 1300 m, Carlos Ribeiro: 2200 m, Bonjardim: 3000 m, Porto: 3900 m) and two additional Reference sites (ca. 550 m). Macrofauna (retained by a 500 μm sieve) was identified to species level whenever possible. The samples yielded modest abundances (70–1567 individuals per 0.25 m 2 ), but the local and regional number of species is among the highest ever reported for cold seeps. Among the 366 recorded species, 22 were symbiont-hosting bivalves (Thyasiridae, Vesicomyidae, Solemyidae) and tubeworms (Siboglinidae). The multivariate analyses supported the significant differences between Shallow and Deep MVs: The environmental conditions at the Shallow MVs make them highly permeable to the penetration of background fauna leading to high diversity of the attendant assemblages ( H ′: 2.92–3.94; ES (100) : 28.3–45.0; J ′: 0.685–0.881). The Deep MV assemblages showed, in general, contrasting features but were more heterogeneous ( H ′: 1.41–3.06; ES (100) : 10.5–30.5; J ′: 0.340–0.852) and often dominated by one or more siboglinid species. The rarefaction curves confirmed the differences in biodiversity of Deep and Shallow MVs as well as the convergence of the latter to the Reference sites. The Bray–Curtis dissimilarity demonstrated the high β-diversity of the assemblages, especially in pairwise comparisons involving ... |
format |
Article in Journal/Newspaper |
author |
M. R. Cunha C. F. Rodrigues L. Génio A. Hilário A. Ravara O. Pfannkuche |
author_facet |
M. R. Cunha C. F. Rodrigues L. Génio A. Hilário A. Ravara O. Pfannkuche |
author_sort |
M. R. Cunha |
title |
Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales |
title_short |
Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales |
title_full |
Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales |
title_fullStr |
Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales |
title_full_unstemmed |
Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz: abundance, biodiversity and diversity partitioning across spatial scales |
title_sort |
macrofaunal assemblages from mud volcanoes in the gulf of cadiz: abundance, biodiversity and diversity partitioning across spatial scales |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-2553-2013 https://doaj.org/article/8adf9227037649169594f66c8020491b |
long_lat |
ENVELOPE(-114.067,-114.067,-74.833,-74.833) ENVELOPE(-65.972,-65.972,-66.448,-66.448) |
geographic |
Bray Kidd |
geographic_facet |
Bray Kidd |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 10, Iss 4, Pp 2553-2568 (2013) |
op_relation |
http://www.biogeosciences.net/10/2553/2013/bg-10-2553-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-2553-2013 1726-4170 1726-4189 https://doaj.org/article/8adf9227037649169594f66c8020491b |
op_doi |
https://doi.org/10.5194/bg-10-2553-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
4 |
container_start_page |
2553 |
op_container_end_page |
2568 |
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1766135058840682496 |