Experimental induction of a large phytoplankton bloom in Antarctic coastal waters
The experimental enclosure of an Antarctic planktonic community in a large (35 m3) mesocosm moored in Johnson's Dock (62°39.576' S, 60°22.408' W, Livingston Island, Bransfield Sector, Antarctica) was followed by a large phytoplankton bloom. This bloom, dominated by the large diatom Th...
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Online Access: | http://hdl.handle.net/10261/54061 https://doi.org/10.3354/meps206073 |
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ftcsic:oai:digital.csic.es:10261/54061 2024-02-11T09:58:48+01:00 Experimental induction of a large phytoplankton bloom in Antarctic coastal waters Agustí, Susana Duarte, Carlos M. 2000 http://hdl.handle.net/10261/54061 https://doi.org/10.3354/meps206073 en eng Inter Research doi:10.3354/meps206073 issn: 0171-8630 Marine Ecology - Progress Series 206: 73- 85 (2000) http://hdl.handle.net/10261/54061 open artículo http://purl.org/coar/resource_type/c_6501 2000 ftcsic https://doi.org/10.3354/meps206073 2024-01-16T09:39:44Z The experimental enclosure of an Antarctic planktonic community in a large (35 m3) mesocosm moored in Johnson's Dock (62°39.576' S, 60°22.408' W, Livingston Island, Bransfield Sector, Antarctica) was followed by a large phytoplankton bloom. This bloom, dominated by the large diatom Thalassiosira antarctica, reached a biomass 1000-fold greater than in the ambient waters. The net growth rate of T. antarctica averaged 0.53 ± 0.17 d-1, with maximum net growth rates close to 1.0 d-1, exceeding the predicted maximal population growth rates by 60 to 200 %. The gross primary production in the mesocosm (49 mmol C m-3 d-1) was about 30 times greater than the concurrent gross production in the ambient waters, while sedimentation losses removed only between 2.1 to 13 % of the biomass d-1 and cell mortality was negligible. The bloom development led to a decline of dissolved inorganic nutrient concentrations to values several times lower than those in the ambient waters, indicating that the ambient nutrients were both available and sufficient to allow the development of the massive algal bloom observed. Light-limitation of the phytoplankton community was likely the factor responsible for the low biomass and production in ambient waters relative to the mesocosm, as indicated by: (1) limited water transparency of about 1 m, which increased up to 6 m as a result of the sedimentation of the glacial flour in the mesocosm; (2) dense pigment packaging (14.7 ± 3 pg chl a μm-3) inside the phytoplankton cells of the community in the ambient waters compared to much lower values (4.2 ± 0.8 pg chl a μm-3) in the mesocosm community; (3) a specific light absorption of the phytoplankton community in the ambient waters 10 times higher (average specific PAR absorption ± SE = 0.018 ± 0.0038 m-1 mg chl a-1) than in the mesocosm community (0.0087 ± 0.002 m-2 mg-1 chl a); and (4) a high apparent quantum yield of the phytoplankton in the ambient waters (0.091 mol O2 [mol photon absorbed]-1), 4-fold higher than that for the community developed in ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Livingston Island Digital.CSIC (Spanish National Research Council) Antarctic Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Marine Ecology Progress Series 206 73 85 |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
The experimental enclosure of an Antarctic planktonic community in a large (35 m3) mesocosm moored in Johnson's Dock (62°39.576' S, 60°22.408' W, Livingston Island, Bransfield Sector, Antarctica) was followed by a large phytoplankton bloom. This bloom, dominated by the large diatom Thalassiosira antarctica, reached a biomass 1000-fold greater than in the ambient waters. The net growth rate of T. antarctica averaged 0.53 ± 0.17 d-1, with maximum net growth rates close to 1.0 d-1, exceeding the predicted maximal population growth rates by 60 to 200 %. The gross primary production in the mesocosm (49 mmol C m-3 d-1) was about 30 times greater than the concurrent gross production in the ambient waters, while sedimentation losses removed only between 2.1 to 13 % of the biomass d-1 and cell mortality was negligible. The bloom development led to a decline of dissolved inorganic nutrient concentrations to values several times lower than those in the ambient waters, indicating that the ambient nutrients were both available and sufficient to allow the development of the massive algal bloom observed. Light-limitation of the phytoplankton community was likely the factor responsible for the low biomass and production in ambient waters relative to the mesocosm, as indicated by: (1) limited water transparency of about 1 m, which increased up to 6 m as a result of the sedimentation of the glacial flour in the mesocosm; (2) dense pigment packaging (14.7 ± 3 pg chl a μm-3) inside the phytoplankton cells of the community in the ambient waters compared to much lower values (4.2 ± 0.8 pg chl a μm-3) in the mesocosm community; (3) a specific light absorption of the phytoplankton community in the ambient waters 10 times higher (average specific PAR absorption ± SE = 0.018 ± 0.0038 m-1 mg chl a-1) than in the mesocosm community (0.0087 ± 0.002 m-2 mg-1 chl a); and (4) a high apparent quantum yield of the phytoplankton in the ambient waters (0.091 mol O2 [mol photon absorbed]-1), 4-fold higher than that for the community developed in ... |
format |
Article in Journal/Newspaper |
author |
Agustí, Susana Duarte, Carlos M. |
spellingShingle |
Agustí, Susana Duarte, Carlos M. Experimental induction of a large phytoplankton bloom in Antarctic coastal waters |
author_facet |
Agustí, Susana Duarte, Carlos M. |
author_sort |
Agustí, Susana |
title |
Experimental induction of a large phytoplankton bloom in Antarctic coastal waters |
title_short |
Experimental induction of a large phytoplankton bloom in Antarctic coastal waters |
title_full |
Experimental induction of a large phytoplankton bloom in Antarctic coastal waters |
title_fullStr |
Experimental induction of a large phytoplankton bloom in Antarctic coastal waters |
title_full_unstemmed |
Experimental induction of a large phytoplankton bloom in Antarctic coastal waters |
title_sort |
experimental induction of a large phytoplankton bloom in antarctic coastal waters |
publisher |
Inter Research |
publishDate |
2000 |
url |
http://hdl.handle.net/10261/54061 https://doi.org/10.3354/meps206073 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Antarctic Livingston Island |
geographic_facet |
Antarctic Livingston Island |
genre |
Antarc* Antarctic Antarctica Livingston Island |
genre_facet |
Antarc* Antarctic Antarctica Livingston Island |
op_relation |
doi:10.3354/meps206073 issn: 0171-8630 Marine Ecology - Progress Series 206: 73- 85 (2000) http://hdl.handle.net/10261/54061 |
op_rights |
open |
op_doi |
https://doi.org/10.3354/meps206073 |
container_title |
Marine Ecology Progress Series |
container_volume |
206 |
container_start_page |
73 |
op_container_end_page |
85 |
_version_ |
1790594571545083904 |