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dc.contributor.authorGarzio, Lori M.  Concept link
dc.contributor.authorSteinberg, Deborah K.  Concept link
dc.contributor.authorErickson, Matthew  Concept link
dc.contributor.authorDucklow, Hugh W.  Concept link
dc.date.accessioned2013-11-20T18:40:40Z
dc.date.available2013-11-20T18:40:40Z
dc.date.issued2013-09-18
dc.identifier.citationAquatic Microbial Ecology 70 (2013): 215-232en_US
dc.identifier.urihttps://hdl.handle.net/1912/6317
dc.descriptionAuthor 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.en_US
dc.description.abstractThe 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.en_US
dc.description.sponsorshipThe Palmer LTER is supported by National Science Foundation award ANT-0823101 from the Division of Polar Programs Antarctic Organisms and Ecosystems Program. Additional funding to support the participation of L.M.G. on a Palmer LTER cruise was provided by A. G. ‘Casey’ Duplantier Jr. and the 1st Advantage Federal Credit Union of Newport News, Virginia, USA.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherInter-Researchen_US
dc.relation.urihttps://doi.org/10.3354/ame01655
dc.subjectMicrozooplanktonen_US
dc.subjectProtozoaen_US
dc.subjectGrazingen_US
dc.subjectWestern Antarctic Peninsulaen_US
dc.subjectSouthern Oceanen_US
dc.subjectClimateen_US
dc.titleMicrozooplankton grazing along the Western Antarctic Peninsulaen_US
dc.typeArticleen_US
dc.identifier.doi10.3354/ame01655


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