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- W2022703610 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 54:269-277 (2009) - DOI: https://doi.org/10.3354/ame01276 Mixotrophy: a widespread and important ecological strategy for planktonic and sea-ice nanoflagellates in the Ross Sea, Antarctica Stefanie Moorthi1,4,*, David A. Caron1, Rebecca J. Gast2, Robert W. Sanders3 1Department of Biological Sciences, University of Southern California, Los Angeles, California 90089, USA 2Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA 3Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, USA 4Present address: Institute for Chemistry and Biology of the Marine Environment (ICBM-Terramare), University of Oldenburg, 26382 Wilhelmshaven, Germany *Email: moorthi@icbm.de ABSTRACT: Mixotrophic nanoflagellates (MNF) were quantified in plankton and sea ice of the Ross Sea, Antarctica, during austral spring. Tracer experiments using fluorescently labeled bacteria (FLB) were conducted to enumerate MNF and determine their contribution to total chloroplastidic and total bacterivorous nanoflagellates. Absolute abundances of MNF were typically <200 ml–1 in plankton assemblages south of the Polar Front, but they comprised 8 to 42% and 3 to 25% of bacterivorous nanoflagellates in the water column and ice cores, respectively. Moreover, they represented up to 10% of all chloroplastidic nanoflagellates in the water column when the prymnesiophyte Phaeocystis antarctica was blooming (up to 23% if P. antarctica, which did not ingest FLB, was excluded from calculations). In ice cores, MNF comprised 5 to 10% of chloroplastidic nanoflagellates. The highest proportions of MNF were found in some surface water samples and in plankton assemblages beneath ice, suggesting a potentially large effect as bacterial grazers in those locations. This study is the first to report abundances and distributions of mixotrophic flagellates in the Southern Ocean. The presence of MNF in every ice and water sample examined suggests that mixotrophy is an important alternative dietary strategy in this region. KEY WORDS: Ross Sea · Antarctica · Mixotrophy · Mixotrophic nanoflagellates · Bacterivory · Plankton · Sea ice · Fluorescently labeled bacteria Full text in pdf format PreviousNextCite this article as: Moorthi S, Caron DA, Gast RJ, Sanders RW (2009) Mixotrophy: a widespread and important ecological strategy for planktonic and sea-ice nanoflagellates in the Ross Sea, Antarctica. Aquat Microb Ecol 54:269-277. https://doi.org/10.3354/ame01276 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 54, No. 3. Online publication date: March 04, 2009 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2009 Inter-Research." @default.
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