Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration
During summer 1994, the production regime at 2 sites located in the Indian sector of the Southern Ocean, one in the Permanent Open Ocean Zone (POOZ) at 52 degrees S, and a second in the Seasonal Ice Zone (SIZ) at 63 degrees S, was dominated by regeneration (0.3 < f-ratio < 0.4). Two time serie...
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Online Access: | https://doi.org/10.3354/meps190053 https://archimer.ifremer.fr/doc/00240/35083/33651.pdf https://archimer.ifremer.fr/doc/00240/35083/ |
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fttriple:oai:gotriple.eu:10670/1.kq95v9 2023-05-15T18:25:22+02:00 Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration Cailliau, C Belviso, S Goutx, M Bedo, A Park, Y Charriaud, E 1999-01-01 https://doi.org/10.3354/meps190053 https://archimer.ifremer.fr/doc/00240/35083/33651.pdf https://archimer.ifremer.fr/doc/00240/35083/ en eng Inter-research doi:10.3354/meps190053 10670/1.kq95v9 https://archimer.ifremer.fr/doc/00240/35083/33651.pdf https://archimer.ifremer.fr/doc/00240/35083/ other Archimer, archive institutionnelle de l'Ifremer Marine Ecology Progress Series (0171-8630) (Inter-research), 1999 , Vol. 190 , P. 53-67 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 1999 fttriple https://doi.org/10.3354/meps190053 2023-01-22T18:37:34Z During summer 1994, the production regime at 2 sites located in the Indian sector of the Southern Ocean, one in the Permanent Open Ocean Zone (POOZ) at 52 degrees S, and a second in the Seasonal Ice Zone (SIZ) at 63 degrees S, was dominated by regeneration (0.3 < f-ratio < 0.4). Two time series, each of about 4 d, were performed over pre-determined time intervals of 4 h using a free-floating sediment trap set at 200 m at the 2 sites. Hourly variations of C, N, chlorophyll a (chl a) and its degradation products, taxon-specific pigments, lipid classes and dimethylsulfoniopropionate (DMSP) were measured simultaneously. Measurements in the water column were done during the sediment trap drifting. Fucoxanthin, a typical diatom pigment, was the major accessory pigment found in the trap material at the 2 stations, whereas, in the water column, the phytoplankton was dominated by flagellates in the POOZ and diatoms in the SIZ. This suggests selective grazing of diatoms by zooplankton and/or mass sinking of diatoms, at least in the POOZ. However, since the set of compounds exhibited strong diel cycles in the POOZ, the export flux appears to mainly result from the zooplankton. The results are ambiguous as to whether the intensified sedimentation at night resulted from vertical migration of euphausiids, since copepods crossing the pycnocline were rare, and/or the nocturnal increase of feeding activity of copepods and microzooplankton. At the SIZ, diatoms dominated in the mixed layer and at the deep phytoplankton maximum (DPM) located at the depth of the temperature minimum (50 to 100 m). However, pigment signature in the trap material suggested the selective sedimentation of nanoflagellates (essentially pelagophytes). Correspondingly, there was high proportions of sterols up to 40% in the trap material. The diel variations somewhat resembling POOZs, the low chi a-to-phaeopigments ratio and the presence of phaeopigments in their most degraded forms were strong indications of the key role played by zooplankton in the ... Text Southern Ocean Copepods Unknown Indian Southern Ocean Marine Ecology Progress Series 190 53 67 |
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fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Cailliau, C Belviso, S Goutx, M Bedo, A Park, Y Charriaud, E Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration |
topic_facet |
geo envir |
description |
During summer 1994, the production regime at 2 sites located in the Indian sector of the Southern Ocean, one in the Permanent Open Ocean Zone (POOZ) at 52 degrees S, and a second in the Seasonal Ice Zone (SIZ) at 63 degrees S, was dominated by regeneration (0.3 < f-ratio < 0.4). Two time series, each of about 4 d, were performed over pre-determined time intervals of 4 h using a free-floating sediment trap set at 200 m at the 2 sites. Hourly variations of C, N, chlorophyll a (chl a) and its degradation products, taxon-specific pigments, lipid classes and dimethylsulfoniopropionate (DMSP) were measured simultaneously. Measurements in the water column were done during the sediment trap drifting. Fucoxanthin, a typical diatom pigment, was the major accessory pigment found in the trap material at the 2 stations, whereas, in the water column, the phytoplankton was dominated by flagellates in the POOZ and diatoms in the SIZ. This suggests selective grazing of diatoms by zooplankton and/or mass sinking of diatoms, at least in the POOZ. However, since the set of compounds exhibited strong diel cycles in the POOZ, the export flux appears to mainly result from the zooplankton. The results are ambiguous as to whether the intensified sedimentation at night resulted from vertical migration of euphausiids, since copepods crossing the pycnocline were rare, and/or the nocturnal increase of feeding activity of copepods and microzooplankton. At the SIZ, diatoms dominated in the mixed layer and at the deep phytoplankton maximum (DPM) located at the depth of the temperature minimum (50 to 100 m). However, pigment signature in the trap material suggested the selective sedimentation of nanoflagellates (essentially pelagophytes). Correspondingly, there was high proportions of sterols up to 40% in the trap material. The diel variations somewhat resembling POOZs, the low chi a-to-phaeopigments ratio and the presence of phaeopigments in their most degraded forms were strong indications of the key role played by zooplankton in the ... |
format |
Text |
author |
Cailliau, C Belviso, S Goutx, M Bedo, A Park, Y Charriaud, E |
author_facet |
Cailliau, C Belviso, S Goutx, M Bedo, A Park, Y Charriaud, E |
author_sort |
Cailliau, C |
title |
Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration |
title_short |
Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration |
title_full |
Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration |
title_fullStr |
Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration |
title_full_unstemmed |
Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration |
title_sort |
sedimentation pathways in the indian sector of the southern ocean during a production regime dominated by regeneration |
publisher |
Inter-research |
publishDate |
1999 |
url |
https://doi.org/10.3354/meps190053 https://archimer.ifremer.fr/doc/00240/35083/33651.pdf https://archimer.ifremer.fr/doc/00240/35083/ |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean Copepods |
genre_facet |
Southern Ocean Copepods |
op_source |
Archimer, archive institutionnelle de l'Ifremer Marine Ecology Progress Series (0171-8630) (Inter-research), 1999 , Vol. 190 , P. 53-67 |
op_relation |
doi:10.3354/meps190053 10670/1.kq95v9 https://archimer.ifremer.fr/doc/00240/35083/33651.pdf https://archimer.ifremer.fr/doc/00240/35083/ |
op_rights |
other |
op_doi |
https://doi.org/10.3354/meps190053 |
container_title |
Marine Ecology Progress Series |
container_volume |
190 |
container_start_page |
53 |
op_container_end_page |
67 |
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1766206787643506688 |