The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton
We used marine phytoplankton from mesocosms seeded with different zooplankton densities to study the impact of mesozooplankton on phytoplankton nutrient limitation. After 7 d of grazing (copepod mesocosms) or 9 d (appendicularian mesocosms) phytoplankton nutrient limitation was studied by enrichment...
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ftpubman:oai:pure.mpg.de:item_1507186 2024-09-15T18:25:24+00:00 The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton Sommer, U. Sommer, F. Feuchtmayr, H. Hansen, T. 2004-09 application/pdf http://hdl.handle.net/11858/00-001M-0000-000F-DA9F-C http://hdl.handle.net/11858/00-001M-0000-000F-DA9E-E eng eng info:eu-repo/semantics/altIdentifier/doi/10.1078/1434461041844268 http://hdl.handle.net/11858/00-001M-0000-000F-DA9F-C http://hdl.handle.net/11858/00-001M-0000-000F-DA9E-E Protist info:eu-repo/semantics/article 2004 ftpubman https://doi.org/10.1078/1434461041844268 2024-07-31T09:31:29Z We used marine phytoplankton from mesocosms seeded with different zooplankton densities to study the impact of mesozooplankton on phytoplankton nutrient limitation. After 7 d of grazing (copepod mesocosms) or 9 d (appendicularian mesocosms) phytoplankton nutrient limitation was studied by enrichment bioassays. After removal of mesozooplankton, bioassay bottles received either no nutrients, phosphorus or nitrogen alone, or a combination of nitrogen and phosphorus and were incubated for 2 d. Phytoplankton reproductive rates in the bottles without nutrient addition were calculated after correction for grazing by ciliates and indicated increasing nitrogen limitation with increasing copepod abundance. No nutrient limitation was found in the appendicularian mesocosms. The increase of nutrient limitation with increasing copepod density seems to be mainly the result of a trophic cascade effect: Copepods released nanoplankton from ciliate grazing pressure, and thereby enhanced nitrogen exhaustion by nanophytoplankton and reduced nitrogen excretion by ciliates. Nitrogen sequestration in copepod biomass, the mechanism predicted by the ecological stoichiometry theory, seems to have been a weaker effect because there was only little copepod growth during the experiment Article in Journal/Newspaper Northeast Atlantic Copepods Max Planck Society: MPG.PuRe Protist 155 3 295 304 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
We used marine phytoplankton from mesocosms seeded with different zooplankton densities to study the impact of mesozooplankton on phytoplankton nutrient limitation. After 7 d of grazing (copepod mesocosms) or 9 d (appendicularian mesocosms) phytoplankton nutrient limitation was studied by enrichment bioassays. After removal of mesozooplankton, bioassay bottles received either no nutrients, phosphorus or nitrogen alone, or a combination of nitrogen and phosphorus and were incubated for 2 d. Phytoplankton reproductive rates in the bottles without nutrient addition were calculated after correction for grazing by ciliates and indicated increasing nitrogen limitation with increasing copepod abundance. No nutrient limitation was found in the appendicularian mesocosms. The increase of nutrient limitation with increasing copepod density seems to be mainly the result of a trophic cascade effect: Copepods released nanoplankton from ciliate grazing pressure, and thereby enhanced nitrogen exhaustion by nanophytoplankton and reduced nitrogen excretion by ciliates. Nitrogen sequestration in copepod biomass, the mechanism predicted by the ecological stoichiometry theory, seems to have been a weaker effect because there was only little copepod growth during the experiment |
format |
Article in Journal/Newspaper |
author |
Sommer, U. Sommer, F. Feuchtmayr, H. Hansen, T. |
spellingShingle |
Sommer, U. Sommer, F. Feuchtmayr, H. Hansen, T. The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton |
author_facet |
Sommer, U. Sommer, F. Feuchtmayr, H. Hansen, T. |
author_sort |
Sommer, U. |
title |
The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton |
title_short |
The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton |
title_full |
The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton |
title_fullStr |
The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton |
title_full_unstemmed |
The influence of mesozooplankton on phytoplankton nutrient limitation: A mesocosm study with northeast Atlantic plankton |
title_sort |
influence of mesozooplankton on phytoplankton nutrient limitation: a mesocosm study with northeast atlantic plankton |
publishDate |
2004 |
url |
http://hdl.handle.net/11858/00-001M-0000-000F-DA9F-C http://hdl.handle.net/11858/00-001M-0000-000F-DA9E-E |
genre |
Northeast Atlantic Copepods |
genre_facet |
Northeast Atlantic Copepods |
op_source |
Protist |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1078/1434461041844268 http://hdl.handle.net/11858/00-001M-0000-000F-DA9F-C http://hdl.handle.net/11858/00-001M-0000-000F-DA9E-E |
op_doi |
https://doi.org/10.1078/1434461041844268 |
container_title |
Protist |
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155 |
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3 |
container_start_page |
295 |
op_container_end_page |
304 |
_version_ |
1810465904143630336 |