Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region
We assessed relationships between phytoplankton standing stock, measured as chlorophyll a (Chl a), primary production (PP), and heterotrophic picoplankton production (HPP), in the epipelagic zone (0–100 m) as well as in the mesopelagic zone (100–1,000 m) in the polar frontal zone of the Atlantic sec...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.544.2811 2023-05-15T13:41:48+02:00 Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region Meinhard Simon Bernd Rosenstock Walter Zwisler The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.2811 http://www.aslo.org/lo/toc/vol_49/issue_4/1035.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.2811 http://www.aslo.org/lo/toc/vol_49/issue_4/1035.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_49/issue_4/1035.pdf text ftciteseerx 2016-01-08T11:12:51Z We assessed relationships between phytoplankton standing stock, measured as chlorophyll a (Chl a), primary production (PP), and heterotrophic picoplankton production (HPP), in the epipelagic zone (0–100 m) as well as in the mesopelagic zone (100–1,000 m) in the polar frontal zone of the Atlantic sector of the Southern Ocean in austral summer (late December to January) and fall (March to early May). Integrated epipelagic HPP was positively correlated to integrated PP in summer (data for fall are not available) but not to integrated Chl a. However, integrated mesopelagic HPP was positively correlated to Chl a in summer as well as fall. The mesopelagic fraction of HPP as a percentage of total HPP was also positively correlated to Chl a, whereas the epipelagic fraction of HPP was negatively correlated to it. These results indicate that with increasing phytoplankton standing stock, constituted mainly of highly silicified diatoms, the focus of its consumption by heterotrophic picoplankton shifts from epipelagic to mesopelagic waters. With a growth efficiency of 30%, our HPP data indicate that in both the epipelagic and mesopelagic zone heterotrophic picoplankton consume 20 % of PP. Mesopelagic heterotrophic picoplankton con-sumed around 80 % of the sinking flux, measured from depletion of 234Th, which is a lower fraction than that reported from the central and subarctic Pacific. Our analysis indicates that it is important to include mesopelagic HPP in comprehensive assessments of the microbial consumption of PP, phytoplankton biomass, and particulate Text Antarc* Antarctic Southern Ocean Subarctic Unknown Antarctic Austral Pacific Southern Ocean The Antarctic |
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Open Polar |
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ftciteseerx |
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English |
description |
We assessed relationships between phytoplankton standing stock, measured as chlorophyll a (Chl a), primary production (PP), and heterotrophic picoplankton production (HPP), in the epipelagic zone (0–100 m) as well as in the mesopelagic zone (100–1,000 m) in the polar frontal zone of the Atlantic sector of the Southern Ocean in austral summer (late December to January) and fall (March to early May). Integrated epipelagic HPP was positively correlated to integrated PP in summer (data for fall are not available) but not to integrated Chl a. However, integrated mesopelagic HPP was positively correlated to Chl a in summer as well as fall. The mesopelagic fraction of HPP as a percentage of total HPP was also positively correlated to Chl a, whereas the epipelagic fraction of HPP was negatively correlated to it. These results indicate that with increasing phytoplankton standing stock, constituted mainly of highly silicified diatoms, the focus of its consumption by heterotrophic picoplankton shifts from epipelagic to mesopelagic waters. With a growth efficiency of 30%, our HPP data indicate that in both the epipelagic and mesopelagic zone heterotrophic picoplankton consume 20 % of PP. Mesopelagic heterotrophic picoplankton con-sumed around 80 % of the sinking flux, measured from depletion of 234Th, which is a lower fraction than that reported from the central and subarctic Pacific. Our analysis indicates that it is important to include mesopelagic HPP in comprehensive assessments of the microbial consumption of PP, phytoplankton biomass, and particulate |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Meinhard Simon Bernd Rosenstock Walter Zwisler |
spellingShingle |
Meinhard Simon Bernd Rosenstock Walter Zwisler Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region |
author_facet |
Meinhard Simon Bernd Rosenstock Walter Zwisler |
author_sort |
Meinhard Simon |
title |
Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region |
title_short |
Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region |
title_full |
Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region |
title_fullStr |
Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region |
title_full_unstemmed |
Coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the Antarctic polar frontal region |
title_sort |
coupling of epipelagic and mesopelagic heterotrophic picoplankton production to phytoplankton biomass in the antarctic polar frontal region |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.2811 http://www.aslo.org/lo/toc/vol_49/issue_4/1035.pdf |
geographic |
Antarctic Austral Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean Subarctic |
genre_facet |
Antarc* Antarctic Southern Ocean Subarctic |
op_source |
http://www.aslo.org/lo/toc/vol_49/issue_4/1035.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.2811 http://www.aslo.org/lo/toc/vol_49/issue_4/1035.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766158303432278016 |