Microzooplankton grazing along the Western Antarctic Peninsula
Author Posting. © Inter-Research, 2013. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Aquatic Microbial Ecology 70 (2013): 215-232, doi:10.3354/ame01655. The significance of microzooplankton as grazers in...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6317 2023-05-15T13:53:14+02:00 Microzooplankton grazing along the Western Antarctic Peninsula Garzio, Lori M. Steinberg, Deborah K. Erickson, Matthew Ducklow, Hugh W. 2013-09-18 application/pdf https://hdl.handle.net/1912/6317 en_US eng Inter-Research https://doi.org/10.3354/ame01655 Aquatic Microbial Ecology 70 (2013): 215-232 https://hdl.handle.net/1912/6317 doi:10.3354/ame01655 Aquatic Microbial Ecology 70 (2013): 215-232 doi:10.3354/ame01655 Microzooplankton Protozoa Grazing Western Antarctic Peninsula Southern Ocean Climate Article 2013 ftwhoas https://doi.org/10.3354/ame01655 2022-05-28T22:58:58Z Author Posting. © Inter-Research, 2013. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Aquatic Microbial Ecology 70 (2013): 215-232, doi:10.3354/ame01655. 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 phytoplankton production in all but one experiment. For high and low nucleic acid content bacteria, growth rates were NS to 0.95 d-1, and grazing mortality rates were NS to 0.43 d-1; microzooplankton often 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. The Palmer LTER is ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Southern Ocean Antarctic Peninsula 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 |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Microzooplankton Protozoa Grazing Western Antarctic Peninsula Southern Ocean Climate |
spellingShingle |
Microzooplankton Protozoa Grazing Western Antarctic Peninsula Southern Ocean Climate Garzio, Lori M. Steinberg, Deborah K. Erickson, Matthew Ducklow, Hugh W. Microzooplankton grazing along the Western Antarctic Peninsula |
topic_facet |
Microzooplankton Protozoa Grazing Western Antarctic Peninsula Southern Ocean Climate |
description |
Author Posting. © Inter-Research, 2013. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Aquatic Microbial Ecology 70 (2013): 215-232, doi:10.3354/ame01655. 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 phytoplankton production in all but one experiment. For high and low nucleic acid content bacteria, growth rates were NS to 0.95 d-1, and grazing mortality rates were NS to 0.43 d-1; microzooplankton often 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. The Palmer LTER is ... |
format |
Article in Journal/Newspaper |
author |
Garzio, Lori M. Steinberg, Deborah K. Erickson, Matthew Ducklow, Hugh W. |
author_facet |
Garzio, Lori M. Steinberg, Deborah K. Erickson, Matthew Ducklow, Hugh W. |
author_sort |
Garzio, Lori M. |
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 |
Inter-Research |
publishDate |
2013 |
url |
https://hdl.handle.net/1912/6317 |
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 Palmer Station Palmer-Station |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Palmer Station Palmer-Station |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_source |
Aquatic Microbial Ecology 70 (2013): 215-232 doi:10.3354/ame01655 |
op_relation |
https://doi.org/10.3354/ame01655 Aquatic Microbial Ecology 70 (2013): 215-232 https://hdl.handle.net/1912/6317 doi:10.3354/ame01655 |
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 |
_version_ |
1766258248772485120 |