The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean
Calanus simillimus, Rhincalanus gigas, grazing, biogeochemistry, biogenic silica. - The role of copepod grazing, particularly of Calanus simillimus and Rhincalanus gigas, in the biogeochemical cycles of silicon (Si) and carbon (C) in the Antarctic Circumpolar Current (ACC) of the Southern Ocean is i...
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ftsubggeo:oai:e-docs.geo-leo.de:11858/00-1735-0000-0001-3156-D 2024-06-09T07:40:44+00:00 The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean Schultes, Sabine 2004 application/pdf http://hdl.handle.net/11858/00-1735-0000-0001-3156-D https://doi.org/10.23689/fidgeo-206 eng eng Univ. Bremen Geologische Wissenschaften doi:10.23689/fidgeo-206 399654488 http://hdl.handle.net/11858/00-1735-0000-0001-3156-D http://e-docs.geo-leo.de/rights ddc:560 doc-type:book publishedVersion 2004 ftsubggeo https://doi.org/10.23689/fidgeo-206 2024-05-10T04:57:11Z Calanus simillimus, Rhincalanus gigas, grazing, biogeochemistry, biogenic silica. - The role of copepod grazing, particularly of Calanus simillimus and Rhincalanus gigas, in the biogeochemical cycles of silicon (Si) and carbon (C) in the Antarctic Circumpolar Current (ACC) of the Southern Ocean is investigated. The two grazers show differences in feeding behavior before and in response to a diatom bloom stimulated by in situ iron fertilization. The continuously high feeding activity of C. simillimus on diatoms is conducive to enhance the export of primary produced C and Si. The grazing impact of this key species is high enough to influence population dynamics in the microplankton communities of the ACC. In the pre-bloom situation, R. gigas fulfils most of its carbon requirement through grazing on detritus and thereby effectively reduces the vertical fecal flux produced by C. simillimus. It is proposed that a Copepod-Retention-System for organic material is put in place by the copepod community under High Nutrient Low Chlorophyll (HNLC) conditions. Prey switching by R. gigas from detritus to diatoms in the bloom situation lifts the grazing check on the detritus flux and enables loss of particulate C and Si from the surface layer with fast sinking fecal pellets. Results from dissolution experiments indicate that the enclosure of biogenic silica (BSi) in copepod fecal pellets prevents the dissolution of diatom frustules. Diatoms submitted to grazing of copepods and krill (Euphausia superba) dissolved 4 to 26 times slower than un-grazed controls. thesis Book Antarc* Antarctic Euphausia superba Southern Ocean Copepods GEO-LEOe-docs (FID GEO) Antarctic Southern Ocean The Antarctic |
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language |
English |
topic |
ddc:560 |
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ddc:560 Schultes, Sabine The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean |
topic_facet |
ddc:560 |
description |
Calanus simillimus, Rhincalanus gigas, grazing, biogeochemistry, biogenic silica. - The role of copepod grazing, particularly of Calanus simillimus and Rhincalanus gigas, in the biogeochemical cycles of silicon (Si) and carbon (C) in the Antarctic Circumpolar Current (ACC) of the Southern Ocean is investigated. The two grazers show differences in feeding behavior before and in response to a diatom bloom stimulated by in situ iron fertilization. The continuously high feeding activity of C. simillimus on diatoms is conducive to enhance the export of primary produced C and Si. The grazing impact of this key species is high enough to influence population dynamics in the microplankton communities of the ACC. In the pre-bloom situation, R. gigas fulfils most of its carbon requirement through grazing on detritus and thereby effectively reduces the vertical fecal flux produced by C. simillimus. It is proposed that a Copepod-Retention-System for organic material is put in place by the copepod community under High Nutrient Low Chlorophyll (HNLC) conditions. Prey switching by R. gigas from detritus to diatoms in the bloom situation lifts the grazing check on the detritus flux and enables loss of particulate C and Si from the surface layer with fast sinking fecal pellets. Results from dissolution experiments indicate that the enclosure of biogenic silica (BSi) in copepod fecal pellets prevents the dissolution of diatom frustules. Diatoms submitted to grazing of copepods and krill (Euphausia superba) dissolved 4 to 26 times slower than un-grazed controls. thesis |
format |
Book |
author |
Schultes, Sabine |
author_facet |
Schultes, Sabine |
author_sort |
Schultes, Sabine |
title |
The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean |
title_short |
The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean |
title_full |
The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean |
title_fullStr |
The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean |
title_full_unstemmed |
The role of mesozooplankton grazing in the biogeochemical cycle of silicon in the Southern Ocean |
title_sort |
role of mesozooplankton grazing in the biogeochemical cycle of silicon in the southern ocean |
publisher |
Univ. Bremen |
publishDate |
2004 |
url |
http://hdl.handle.net/11858/00-1735-0000-0001-3156-D https://doi.org/10.23689/fidgeo-206 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Euphausia superba Southern Ocean Copepods |
genre_facet |
Antarc* Antarctic Euphausia superba Southern Ocean Copepods |
op_relation |
Geologische Wissenschaften doi:10.23689/fidgeo-206 399654488 http://hdl.handle.net/11858/00-1735-0000-0001-3156-D |
op_rights |
http://e-docs.geo-leo.de/rights |
op_doi |
https://doi.org/10.23689/fidgeo-206 |
_version_ |
1801369131673452544 |