Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica
The sedimentation rates, aggregation and biodegradability of phytoplankton-derived material were investigated in the Ross Sea Polynya during austral spring, 1997. Planktonic organisms and aggregates were collected using a large volume (1001) sampler. The phytoplankton assemblages were dominated by d...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Language: | English |
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ftvliz:oai:oma.vliz.be:210791 2023-05-15T13:33:15+02:00 Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica Becquevort, S. Smith, W.O. 2001 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=210791 en eng info:eu-repo/semantics/altIdentifier/wos/000172954400013 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/S0967-0645(01)00084-4 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=210791 info:eu-repo/semantics/restrictedAccess %3Ci%3EDeep-Sea+Res.,+Part+II,+Top.+Stud.+Oceanogr.+48%2819-20%29%3C%2Fi%3E%3A+4155-4178.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2FS0967-0645%2801%2900084-4%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2FS0967-0645%2801%2900084-4%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2001 ftvliz https://doi.org/10.1016/S0967-0645(01)00084-4 2022-05-01T09:37:27Z The sedimentation rates, aggregation and biodegradability of phytoplankton-derived material were investigated in the Ross Sea Polynya during austral spring, 1997. Planktonic organisms and aggregates were collected using a large volume (1001) sampler. The phytoplankton assemblages were dominated by diatoms and/or Phaeocystis antarctica , a colonial haptophyte. Total community sinking rates of phytoplankton or derived aggregates were low, ranging between 0 and 1 m d -1 , except towards mid-December when the sinking rates increased to 3 m d -1 . At this time, the co-occurrence of Phaeocystis colonies and diatoms resulted in the enhanced formation of aggregates. Taxon-specific differences in sinking behaviour were observed, in that diatoms and dinoflagellates had higher sinking rates than P. antarctica . The biodegradability of phytoplankton-derived material was estimated from the enzymatic (ectoprotease. ecto-beta -glucosidase) activities of free-living vs. particle-attached bacteria. Bacterial production rates were very low until late November, and from mid-December the bacterial activities increased slowly. At the same time, the proportion of attached bacteria increased; nevertheless, their contribution to the total bacterial activity remained low (less than 19% for ectoprotease, 24% for ecto-beta -glucosidase and 18% for bacterial production). In contrast, specific (per cell) activities were higher for particle-attached bacteria than for free-living bacteria. Calculations suggest that 1.4-38.5% of the primary production potentially could be removed from the euphotic zone via sinking during spring, and 0.5-11.6% could be remineralized by bacterial metabolism, with a minor contribution of particle-attached bacteria (less than 2% of the primary production). Thus, during the most active period of phytoplankton growth when grazing losses are nearly non-existent, most of the removal of phytoplankton-derived particulate material is by passive sinking, and only a small amount of the particulate organic carbon is heterotrophically oxidized. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Austral Ross Sea Deep Sea Research Part II: Topical Studies in Oceanography 48 19-20 4155 4178 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
The sedimentation rates, aggregation and biodegradability of phytoplankton-derived material were investigated in the Ross Sea Polynya during austral spring, 1997. Planktonic organisms and aggregates were collected using a large volume (1001) sampler. The phytoplankton assemblages were dominated by diatoms and/or Phaeocystis antarctica , a colonial haptophyte. Total community sinking rates of phytoplankton or derived aggregates were low, ranging between 0 and 1 m d -1 , except towards mid-December when the sinking rates increased to 3 m d -1 . At this time, the co-occurrence of Phaeocystis colonies and diatoms resulted in the enhanced formation of aggregates. Taxon-specific differences in sinking behaviour were observed, in that diatoms and dinoflagellates had higher sinking rates than P. antarctica . The biodegradability of phytoplankton-derived material was estimated from the enzymatic (ectoprotease. ecto-beta -glucosidase) activities of free-living vs. particle-attached bacteria. Bacterial production rates were very low until late November, and from mid-December the bacterial activities increased slowly. At the same time, the proportion of attached bacteria increased; nevertheless, their contribution to the total bacterial activity remained low (less than 19% for ectoprotease, 24% for ecto-beta -glucosidase and 18% for bacterial production). In contrast, specific (per cell) activities were higher for particle-attached bacteria than for free-living bacteria. Calculations suggest that 1.4-38.5% of the primary production potentially could be removed from the euphotic zone via sinking during spring, and 0.5-11.6% could be remineralized by bacterial metabolism, with a minor contribution of particle-attached bacteria (less than 2% of the primary production). Thus, during the most active period of phytoplankton growth when grazing losses are nearly non-existent, most of the removal of phytoplankton-derived particulate material is by passive sinking, and only a small amount of the particulate organic carbon is heterotrophically oxidized. |
format |
Article in Journal/Newspaper |
author |
Becquevort, S. Smith, W.O. |
spellingShingle |
Becquevort, S. Smith, W.O. Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica |
author_facet |
Becquevort, S. Smith, W.O. |
author_sort |
Becquevort, S. |
title |
Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica |
title_short |
Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica |
title_full |
Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica |
title_fullStr |
Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica |
title_full_unstemmed |
Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica |
title_sort |
aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the ross sea, antarctica |
publishDate |
2001 |
url |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=210791 |
geographic |
Austral Ross Sea |
geographic_facet |
Austral Ross Sea |
genre |
Antarc* Antarctica Ross Sea |
genre_facet |
Antarc* Antarctica Ross Sea |
op_source |
%3Ci%3EDeep-Sea+Res.,+Part+II,+Top.+Stud.+Oceanogr.+48%2819-20%29%3C%2Fi%3E%3A+4155-4178.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2FS0967-0645%2801%2900084-4%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2FS0967-0645%2801%2900084-4%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000172954400013 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/S0967-0645(01)00084-4 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=210791 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0967-0645(01)00084-4 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
48 |
container_issue |
19-20 |
container_start_page |
4155 |
op_container_end_page |
4178 |
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1766040523778293760 |