Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica
ABSTRACTLarge (>64 µm) protozooplankton (radiolarians, thecate dinoflagellates, foraminiferans, and tintinnid ciliates) and copepod nauplii were sampled at six stations located in sea ice covered waters, using a multinet at five depth intervals between the surface and 1000 m during a late winter...
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1991
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ftawi:oai:epic.awi.de:2274 2023-09-05T13:12:10+02:00 Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica Nöthig, Eva-Maria Gowing, M. M. 1991 https://epic.awi.de/id/eprint/2274/ https://hdl.handle.net/10013/epic.12862 unknown Nöthig, E. M. orcid:0000-0002-7527-7827 and Gowing, M. M. (1991) Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica , Marine biology, 111 , pp. 473-484 . hdl:10013/epic.12862 EPIC3Marine biology, 111, pp. 473-484 Article isiRev 1991 ftawi 2023-08-22T19:43:12Z ABSTRACTLarge (>64 µm) protozooplankton (radiolarians, thecate dinoflagellates, foraminiferans, and tintinnid ciliates) and copepod nauplii were sampled at six stations located in sea ice covered waters, using a multinet at five depth intervals between the surface and 1000 m during a late winter expedition of RV 'Polarstern' on a west-east transect across the Weddell Sea. Large (> 400 µm) phaeodarian radiolarians contributed more than 98 % of the carbon in the large protozooplankton fraction; large protozoo-plankton were approximately 38 % of the total protozooplankton carbon during the late winter under the close pack ice in the upper 250 m. Large protozooplankton may therefore be an important food source for small particle-feeding zooplankton in the upper 250m, and a modest food source down to 1000m. Phaeodarian species distributions showed a distinct vertical pattern. Except for spumellarian and nassellarian radiolarians all other protozooplankton (foraminiferans, thecate dinoflagellates, tintinnids) were most abundant in the upper 250 m. The horizontal variation showed a western, central and eastern pattern most probably due to the differing regional hydrography. Feeding ecology of the dominant species of phaeodarians was examined using transmission electron microscopy of contents of feeding vacuoles. The 58 specimens were trophic generalists. The predominance of silica fragments and amorphous material in vacuoles and the similarity of vacuole contents of specimens from 3 depth zones suggest that phaeodarians in late winter may have fed on organic aggregates. Article in Journal/Newspaper Antarc* Antarctica Sea ice Weddell Sea ice covered waters Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Weddell Weddell Sea |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
ABSTRACTLarge (>64 µm) protozooplankton (radiolarians, thecate dinoflagellates, foraminiferans, and tintinnid ciliates) and copepod nauplii were sampled at six stations located in sea ice covered waters, using a multinet at five depth intervals between the surface and 1000 m during a late winter expedition of RV 'Polarstern' on a west-east transect across the Weddell Sea. Large (> 400 µm) phaeodarian radiolarians contributed more than 98 % of the carbon in the large protozooplankton fraction; large protozoo-plankton were approximately 38 % of the total protozooplankton carbon during the late winter under the close pack ice in the upper 250 m. Large protozooplankton may therefore be an important food source for small particle-feeding zooplankton in the upper 250m, and a modest food source down to 1000m. Phaeodarian species distributions showed a distinct vertical pattern. Except for spumellarian and nassellarian radiolarians all other protozooplankton (foraminiferans, thecate dinoflagellates, tintinnids) were most abundant in the upper 250 m. The horizontal variation showed a western, central and eastern pattern most probably due to the differing regional hydrography. Feeding ecology of the dominant species of phaeodarians was examined using transmission electron microscopy of contents of feeding vacuoles. The 58 specimens were trophic generalists. The predominance of silica fragments and amorphous material in vacuoles and the similarity of vacuole contents of specimens from 3 depth zones suggest that phaeodarians in late winter may have fed on organic aggregates. |
format |
Article in Journal/Newspaper |
author |
Nöthig, Eva-Maria Gowing, M. M. |
spellingShingle |
Nöthig, Eva-Maria Gowing, M. M. Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica |
author_facet |
Nöthig, Eva-Maria Gowing, M. M. |
author_sort |
Nöthig, Eva-Maria |
title |
Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica |
title_short |
Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica |
title_full |
Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica |
title_fullStr |
Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica |
title_full_unstemmed |
Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica |
title_sort |
late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the weddell sea, antarctica |
publishDate |
1991 |
url |
https://epic.awi.de/id/eprint/2274/ https://hdl.handle.net/10013/epic.12862 |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Antarc* Antarctica Sea ice Weddell Sea ice covered waters |
genre_facet |
Antarc* Antarctica Sea ice Weddell Sea ice covered waters |
op_source |
EPIC3Marine biology, 111, pp. 473-484 |
op_relation |
Nöthig, E. M. orcid:0000-0002-7527-7827 and Gowing, M. M. (1991) Late winter abundance and distribution of phaeodarian radiolarians, other large protozooplankton and copepod nauplii in the Weddell Sea, Antarctica , Marine biology, 111 , pp. 473-484 . hdl:10013/epic.12862 |
_version_ |
1776199193623265280 |