Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey
Conflicting data have been previously presented on the ability of copepods to prey upon the prymneslophyte Phaeocystis pouchetii. While some have suggested that gelatinous colonies of this species contain biochemical substances that prevent their consumption, others have shown that both single cells...
Published in: | Marine Ecology Progress Series |
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Language: | English |
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1990
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Online Access: | http://hdl.handle.net/11250/108478 https://doi.org/10.3354/meps067235 |
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ftimr:oai:imr.brage.unit.no:11250/108478 2023-05-15T15:07:13+02:00 Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey Estep, Kenneth W. Nejstgaard, Jens Christian Skjoldal, Hein Rune Rey, Francisco 1990-11-01 1233809 bytes application/pdf http://hdl.handle.net/11250/108478 https://doi.org/10.3354/meps067235 eng eng urn:issn:0171-8630 http://hdl.handle.net/11250/108478 http://dx.doi.org/10.3354/meps067235 235-249 67 Marine Ecology Progress Series Phaeocystis pouchetii rymneslophyte Journal article Peer reviewed 1990 ftimr https://doi.org/10.3354/meps067235 2021-09-23T20:14:39Z Conflicting data have been previously presented on the ability of copepods to prey upon the prymneslophyte Phaeocystis pouchetii. While some have suggested that gelatinous colonies of this species contain biochemical substances that prevent their consumption, others have shown that both single cells and colonies of P. pouchetii can serve as an excellent food source. The present study presents data from feeding experiments using 4 species of copepods and natural samples of phytoplankton prey from a south-north transect during May 1989 in the Barents Sea Natural phytoplankton contained P. pouchetii colonies inn association with varying amounts of diatoms. Along the transect these colonies varied from highly fluorescent and healthy in the north, to weakly fluorescent in the south. Results of experiments using both image analysis and radiotracer techniques indicate that diatoms were actively preyed upon in all experiments, with long-chain-forming species as the preferred food. Predation upon P. pouchetii colonies as dependent upon the physiological condition of the colonies. Healthy colonies were not consumed, while susceptible colonies were consumed at rates 2 to 10 times those for chain-forming diatoms. The selective predation described here has important implications for species composition in Arctic waters. Article in Journal/Newspaper Arctic Barents Sea Phytoplankton Copepods Institute for Marine Research: Brage IMR Arctic Barents Sea Marine Ecology Progress Series 67 235 249 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
Phaeocystis pouchetii rymneslophyte |
spellingShingle |
Phaeocystis pouchetii rymneslophyte Estep, Kenneth W. Nejstgaard, Jens Christian Skjoldal, Hein Rune Rey, Francisco Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey |
topic_facet |
Phaeocystis pouchetii rymneslophyte |
description |
Conflicting data have been previously presented on the ability of copepods to prey upon the prymneslophyte Phaeocystis pouchetii. While some have suggested that gelatinous colonies of this species contain biochemical substances that prevent their consumption, others have shown that both single cells and colonies of P. pouchetii can serve as an excellent food source. The present study presents data from feeding experiments using 4 species of copepods and natural samples of phytoplankton prey from a south-north transect during May 1989 in the Barents Sea Natural phytoplankton contained P. pouchetii colonies inn association with varying amounts of diatoms. Along the transect these colonies varied from highly fluorescent and healthy in the north, to weakly fluorescent in the south. Results of experiments using both image analysis and radiotracer techniques indicate that diatoms were actively preyed upon in all experiments, with long-chain-forming species as the preferred food. Predation upon P. pouchetii colonies as dependent upon the physiological condition of the colonies. Healthy colonies were not consumed, while susceptible colonies were consumed at rates 2 to 10 times those for chain-forming diatoms. The selective predation described here has important implications for species composition in Arctic waters. |
format |
Article in Journal/Newspaper |
author |
Estep, Kenneth W. Nejstgaard, Jens Christian Skjoldal, Hein Rune Rey, Francisco |
author_facet |
Estep, Kenneth W. Nejstgaard, Jens Christian Skjoldal, Hein Rune Rey, Francisco |
author_sort |
Estep, Kenneth W. |
title |
Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey |
title_short |
Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey |
title_full |
Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey |
title_fullStr |
Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey |
title_full_unstemmed |
Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey |
title_sort |
predation by copepods upon natural populations of phaeocystis pouchetii as a function of the physiological state of the prey |
publishDate |
1990 |
url |
http://hdl.handle.net/11250/108478 https://doi.org/10.3354/meps067235 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea Phytoplankton Copepods |
genre_facet |
Arctic Barents Sea Phytoplankton Copepods |
op_source |
235-249 67 Marine Ecology Progress Series |
op_relation |
urn:issn:0171-8630 http://hdl.handle.net/11250/108478 http://dx.doi.org/10.3354/meps067235 |
op_doi |
https://doi.org/10.3354/meps067235 |
container_title |
Marine Ecology Progress Series |
container_volume |
67 |
container_start_page |
235 |
op_container_end_page |
249 |
_version_ |
1766338774048964608 |