Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera
The abundance and diversity of the deep-sea benthos are intimately linked to inputs of organic matter from the euphotic zone. However, it is often difficult to isolate the influence of surface productivity on benthic ecosystems from other environmental factors. To this end, two abyssal sites (4200 m...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/149522/ https://doi.org/10.1016/j.dsr2.2007.06.006 |
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ftnerc:oai:nora.nerc.ac.uk:149522 2023-05-15T18:25:16+02:00 Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera Hughes, J.A. Smith, T. Chaillan, F. Bett, B.J. Billett, D.S.M. Boorman, B. Fisher, E.H. Frenz, M. Wolff, G.A. 2007 http://nora.nerc.ac.uk/id/eprint/149522/ https://doi.org/10.1016/j.dsr2.2007.06.006 unknown Hughes, J.A.; Smith, T.; Chaillan, F.; Bett, B.J. orcid:0000-0003-4977-9361 Billett, D.S.M.; Boorman, B.; Fisher, E.H.; Frenz, M.; Wolff, G.A. 2007 Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera. Deep-Sea Research II, 54 (18-20). 2275-2290. https://doi.org/10.1016/j.dsr2.2007.06.006 <https://doi.org/10.1016/j.dsr2.2007.06.006> Publication - Article PeerReviewed 2007 ftnerc https://doi.org/10.1016/j.dsr2.2007.06.006 2023-02-04T19:34:52Z The abundance and diversity of the deep-sea benthos are intimately linked to inputs of organic matter from the euphotic zone. However, it is often difficult to isolate the influence of surface productivity on benthic ecosystems from other environmental factors. To this end, two abyssal sites (4200 m water depth) located under contrasting productivity regimes around the Crozet Plateau, in the Indian Ocean sector of the Southern Ocean, were sampled during the austral summer of 2004/2005. One site (M5), east of the Crozet Isles, was located beneath an area where there was an enduring seasonal phytoplankton bloom. The second site (M6) was located in an oligotrophic high-nutrient low-chlorophyll (HNLC) region to the south of the islands. Organic fluxes to the seafloor at these sites are thought to reflect the overlying productivities, so that the benthic environment to the east of the islands was more eutrophic than at the southerly station. All other environmental variables were similar at the two sites, which are located just 460 km apart. The concentrations of chlorophyll-a and total organic carbon in the surficial sediments were significantly greater at the relatively eutrophic site, east of the islands (M5), than at the southerly site (M6). Total nitrogen, however, was similar at both sites. Significantly higher phytopigment concentrations were observed in the surficial sediments at the eutrophic site; in particular, the concentration of chlorophyll-a was 3 times greater than at the southern site, although the freshness of the labile component, as measured by chlorophyll-a to pheophorbide ratio, was not different between sites. These results confirm that fluxes of organic matter to the seafloor were higher at the site located beneath the bloom region. This was reflected in the abundance and diversity of live (stained) and dead benthic foraminifera (>125 μm), which were greater at the eutrophic site. The species composition of the dead foraminiferal assemblages were similar at both sites, however, and were ... Article in Journal/Newspaper Southern Ocean Natural Environment Research Council: NERC Open Research Archive Southern Ocean Austral Indian Deep Sea Research Part II: Topical Studies in Oceanography 54 18-20 2275 2290 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
The abundance and diversity of the deep-sea benthos are intimately linked to inputs of organic matter from the euphotic zone. However, it is often difficult to isolate the influence of surface productivity on benthic ecosystems from other environmental factors. To this end, two abyssal sites (4200 m water depth) located under contrasting productivity regimes around the Crozet Plateau, in the Indian Ocean sector of the Southern Ocean, were sampled during the austral summer of 2004/2005. One site (M5), east of the Crozet Isles, was located beneath an area where there was an enduring seasonal phytoplankton bloom. The second site (M6) was located in an oligotrophic high-nutrient low-chlorophyll (HNLC) region to the south of the islands. Organic fluxes to the seafloor at these sites are thought to reflect the overlying productivities, so that the benthic environment to the east of the islands was more eutrophic than at the southerly station. All other environmental variables were similar at the two sites, which are located just 460 km apart. The concentrations of chlorophyll-a and total organic carbon in the surficial sediments were significantly greater at the relatively eutrophic site, east of the islands (M5), than at the southerly site (M6). Total nitrogen, however, was similar at both sites. Significantly higher phytopigment concentrations were observed in the surficial sediments at the eutrophic site; in particular, the concentration of chlorophyll-a was 3 times greater than at the southern site, although the freshness of the labile component, as measured by chlorophyll-a to pheophorbide ratio, was not different between sites. These results confirm that fluxes of organic matter to the seafloor were higher at the site located beneath the bloom region. This was reflected in the abundance and diversity of live (stained) and dead benthic foraminifera (>125 μm), which were greater at the eutrophic site. The species composition of the dead foraminiferal assemblages were similar at both sites, however, and were ... |
format |
Article in Journal/Newspaper |
author |
Hughes, J.A. Smith, T. Chaillan, F. Bett, B.J. Billett, D.S.M. Boorman, B. Fisher, E.H. Frenz, M. Wolff, G.A. |
spellingShingle |
Hughes, J.A. Smith, T. Chaillan, F. Bett, B.J. Billett, D.S.M. Boorman, B. Fisher, E.H. Frenz, M. Wolff, G.A. Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera |
author_facet |
Hughes, J.A. Smith, T. Chaillan, F. Bett, B.J. Billett, D.S.M. Boorman, B. Fisher, E.H. Frenz, M. Wolff, G.A. |
author_sort |
Hughes, J.A. |
title |
Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera |
title_short |
Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera |
title_full |
Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera |
title_fullStr |
Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera |
title_full_unstemmed |
Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera |
title_sort |
two abyssal sites in the southern ocean influenced by different organic matter inputs: environmental characterization and preliminary observations on the benthic foraminifera |
publishDate |
2007 |
url |
http://nora.nerc.ac.uk/id/eprint/149522/ https://doi.org/10.1016/j.dsr2.2007.06.006 |
geographic |
Southern Ocean Austral Indian |
geographic_facet |
Southern Ocean Austral Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Hughes, J.A.; Smith, T.; Chaillan, F.; Bett, B.J. orcid:0000-0003-4977-9361 Billett, D.S.M.; Boorman, B.; Fisher, E.H.; Frenz, M.; Wolff, G.A. 2007 Two abyssal sites in the Southern Ocean influenced by different organic matter inputs: Environmental characterization and preliminary observations on the benthic foraminifera. Deep-Sea Research II, 54 (18-20). 2275-2290. https://doi.org/10.1016/j.dsr2.2007.06.006 <https://doi.org/10.1016/j.dsr2.2007.06.006> |
op_doi |
https://doi.org/10.1016/j.dsr2.2007.06.006 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
54 |
container_issue |
18-20 |
container_start_page |
2275 |
op_container_end_page |
2290 |
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1766206599311917056 |