Microzooplankton grazing along the Western Antarctic Peninsula
The significance of microzooplankton as grazers in pelagic ecosystems has been established, yet relatively few studies of microzooplankton grazing, compared to that of macrozooplankton, have been conducted in the Southern Ocean. We report phytoplankton and bacterial growth and grazing mortality rate...
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-1902 2023-06-11T04:04:43+02:00 Microzooplankton grazing along the Western Antarctic Peninsula Garzio, LM Steinberg, Deborah K. Erickson, M Ducklow, HW 2013-01-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/902 doi: 10.3354/ame01655 https://scholarworks.wm.edu/context/vimsarticles/article/1902/viewcontent/a070p215.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/902 doi: 10.3354/ame01655 https://scholarworks.wm.edu/context/vimsarticles/article/1902/viewcontent/a070p215.pdf VIMS Articles Protozooplankton Community Structure Microbial Food-Web Southern-Ocean Phytoplankton Growth Ciliate Microzooplankton Heterotrophic Protists Bacterial Production Atlantic Sector Coastal Waters Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries text 2013 ftwilliammarycol https://doi.org/10.3354/ame01655 2023-05-04T17:43:31Z The significance of microzooplankton as grazers in pelagic ecosystems has been established, yet relatively few studies of microzooplankton grazing, compared to that of macrozooplankton, have been conducted in the Southern Ocean. We report phytoplankton and bacterial growth and grazing mortality rates along the Western Antarctic Peninsula (WAP), a region of rapid climate change. Growth and grazing rates were determined by dilution experiments at select stations along the WAP in January of 2009 to 2011 and in the nearshore waters near Palmer Station in February and March 2011. Microzooplankton exerted higher grazing pressure on bacteria compared to phytoplankton along the WAP and also selectively grazed on smaller phytoplankton (picoautotrophs and nanophytoplankton) and on the more actively growing (high nucleic acid) bacterial cells. Among all phytoplankton size classes, growth rates ranged from undetectable (i.e. not significant; NS) to 0.99 d(-1), grazing mortality rates were NS to 0.56 d(-1), and microzooplankton removed 100% of daily bacterial production. There was a significant (albeit weak) exponential relationship between temperature and phytoplankton mortality, although the range of experimental temperatures was small. The present study provides a reference point of microzooplankton grazing impact along the WAP in the summer and contributes valuable information to studies modeling the flow of carbon through the WAP food web, improving our ability to predict climate-induced changes in the WAP ecosystem. Text Antarc* Antarctic Antarctic Peninsula Southern Ocean W&M ScholarWorks Antarctic Southern Ocean Antarctic Peninsula Austral Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Aquatic Microbial Ecology 70 3 215 232 |
institution |
Open Polar |
collection |
W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
language |
unknown |
topic |
Protozooplankton Community Structure Microbial Food-Web Southern-Ocean Phytoplankton Growth Ciliate Microzooplankton Heterotrophic Protists Bacterial Production Atlantic Sector Coastal Waters Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries |
spellingShingle |
Protozooplankton Community Structure Microbial Food-Web Southern-Ocean Phytoplankton Growth Ciliate Microzooplankton Heterotrophic Protists Bacterial Production Atlantic Sector Coastal Waters Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries Garzio, LM Steinberg, Deborah K. Erickson, M Ducklow, HW Microzooplankton grazing along the Western Antarctic Peninsula |
topic_facet |
Protozooplankton Community Structure Microbial Food-Web Southern-Ocean Phytoplankton Growth Ciliate Microzooplankton Heterotrophic Protists Bacterial Production Atlantic Sector Coastal Waters Austral Summer Biological Sciences Peer-Reviewed Articles Aquaculture and Fisheries |
description |
The significance of microzooplankton as grazers in pelagic ecosystems has been established, yet relatively few studies of microzooplankton grazing, compared to that of macrozooplankton, have been conducted in the Southern Ocean. We report phytoplankton and bacterial growth and grazing mortality rates along the Western Antarctic Peninsula (WAP), a region of rapid climate change. Growth and grazing rates were determined by dilution experiments at select stations along the WAP in January of 2009 to 2011 and in the nearshore waters near Palmer Station in February and March 2011. Microzooplankton exerted higher grazing pressure on bacteria compared to phytoplankton along the WAP and also selectively grazed on smaller phytoplankton (picoautotrophs and nanophytoplankton) and on the more actively growing (high nucleic acid) bacterial cells. Among all phytoplankton size classes, growth rates ranged from undetectable (i.e. not significant; NS) to 0.99 d(-1), grazing mortality rates were NS to 0.56 d(-1), and microzooplankton removed 100% of daily bacterial production. There was a significant (albeit weak) exponential relationship between temperature and phytoplankton mortality, although the range of experimental temperatures was small. The present study provides a reference point of microzooplankton grazing impact along the WAP in the summer and contributes valuable information to studies modeling the flow of carbon through the WAP food web, improving our ability to predict climate-induced changes in the WAP ecosystem. |
format |
Text |
author |
Garzio, LM Steinberg, Deborah K. Erickson, M Ducklow, HW |
author_facet |
Garzio, LM Steinberg, Deborah K. Erickson, M Ducklow, HW |
author_sort |
Garzio, LM |
title |
Microzooplankton grazing along the Western Antarctic Peninsula |
title_short |
Microzooplankton grazing along the Western Antarctic Peninsula |
title_full |
Microzooplankton grazing along the Western Antarctic Peninsula |
title_fullStr |
Microzooplankton grazing along the Western Antarctic Peninsula |
title_full_unstemmed |
Microzooplankton grazing along the Western Antarctic Peninsula |
title_sort |
microzooplankton grazing along the western antarctic peninsula |
publisher |
W&M ScholarWorks |
publishDate |
2013 |
url |
https://scholarworks.wm.edu/vimsarticles/902 https://scholarworks.wm.edu/context/vimsarticles/article/1902/viewcontent/a070p215.pdf |
long_lat |
ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Austral Palmer Station Palmer-Station |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Austral Palmer Station Palmer-Station |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/902 doi: 10.3354/ame01655 https://scholarworks.wm.edu/context/vimsarticles/article/1902/viewcontent/a070p215.pdf |
op_doi |
https://doi.org/10.3354/ame01655 |
container_title |
Aquatic Microbial Ecology |
container_volume |
70 |
container_issue |
3 |
container_start_page |
215 |
op_container_end_page |
232 |
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1768390134671081472 |