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Protistan communities in the Australian sector of the Sub-Antarctic Zone during SAZ-Sense


de Salas, MF and Eriksen, RS and Davidson, A and Wright, SW, Protistan communities in the Australian sector of the Sub-Antarctic Zone during SAZ-Sense, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 58, (21-22) pp. 2135-2149. ISSN 0967-0645 (2011) [Refereed Article]

Copyright Statement

Copyright 2011 Elsevier Ltd.

DOI: doi:10.1016/j.dsr2.2011.05.032


Protistan species composition and abundance in the Sub-Antarctic Zone (SAZ) and Polar Front Zone (PFZ) south of Tasmania were determined by microscopy and pigment analysis from samples collected during the Sub-Antarctic Zone—Sensitivity of the sub-Antarctic Zone to Environmental Change (SAZ-Sense) voyage, in January and February of 2007. A primary goal of this voyage was to determine the potential effects of climate change-induced natural iron fertilisation of the SAZ on the protistan community by exploring differences between communities in waters west of Tasmania, which are low in iron, and eastern waters, which are fertilised by continental iron input and mixing across the subtropical front. The SAZ is a sink for anthropogenic CO2 in spring, but the magnitude of this may vary depending on seasonal changes in protistan abundance, composition and trophodynamics. Protistan species composition and abundance in the western Sub-Antarctic Zone at process station 1 (P1) showed a community in which low carbon biomass was dominated by a Thalassiosira sp., which was very weakly silicified under strong silica limitation. Protistan cell carbon was dominated by diatoms and nano-picoflagellates at process station 2 (P2) in the Polar Front Zone (PFZ), while dinoflagellates dominated in the iron-enriched waters of eastern SAZ at station 3 (P3). Iron enrichment enhanced production and favoured proliferation of small flagellates during summer in the silica-depleted eastern SAZ rather than large diatoms, though the effect this may have on the vertical export of particulate organic carbon (POC) is still unclear.

Item Details

Item Type:Refereed Article
Keywords:Southern Ocean, marine protists, phytoplankton, protozoa pigments, CHEMTAX, iron, silica
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:de Salas, MF (Dr Miguel de Salas)
UTAS Author:Eriksen, RS (Dr Ruth Eriksen)
UTAS Author:Davidson, A (Dr Andrew Davidson)
UTAS Author:Wright, SW (Dr Simon Wright)
ID Code:79895
Year Published:2011
Web of Science® Times Cited:40
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-10-10
Last Modified:2017-11-01

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