Mixotrophy : a widespread and important ecological strategy for planktonic and sea-ice nanoflagellates in the Ross Sea, Antarctica

dc.contributor.author Moorthi, Stefanie D.
dc.contributor.author Caron, David A.
dc.contributor.author Gast, Rebecca J.
dc.contributor.author Sanders, Robert W.
dc.date.accessioned 2011-05-04T13:40:40Z
dc.date.available 2011-05-04T13:40:40Z
dc.date.issued 2009-03-04
dc.description Author Posting. © Inter-Research, 2009. 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 54 (2009): 269-277, doi:10.3354/ame01276. en_US
dc.description.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. en_US
dc.description.sponsorship This work was supported by NSF grant OPP-0125833 to D.A.C. and R.J.G. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Aquatic Microbial Ecology 54 (2009): 269-277 en_US
dc.identifier.doi 10.3354/ame01276
dc.identifier.uri https://hdl.handle.net/1912/4537
dc.language.iso en en_US
dc.publisher Inter-Research en_US
dc.relation.uri https://doi.org/10.3354/ame01276
dc.subject Ross Sea en_US
dc.subject Antarctica en_US
dc.subject Mixotrophy en_US
dc.subject Mixotrophic nanoflagellates en_US
dc.subject Bacterivory en_US
dc.subject Plankton en_US
dc.subject Sea ice en_US
dc.subject Fluorescently labeled bacteria en_US
dc.title Mixotrophy : a widespread and important ecological strategy for planktonic and sea-ice nanoflagellates in the Ross Sea, Antarctica en_US
dc.type Article en_US
dspace.entity.type Publication
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