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Journal of Plankton Research Vol.22 no.2 pp.287-303, 2000
© Oxford University Press 2000

Effect of permanent sea ice cover and different nutrient regimes on the phytoplankton succession of fjords of the Vestfold Hills Oasis, eastern Antarctica

Andrew McMinn, Nerida Bleakley1, Kerrie Steinburner, Donna Roberts and Louise Trenerry

Institute of Antarctic and Southern Ocean Studies, University of Tasmania, Box 252–77, Hobart 7001, Tasmania and 1 Centre for Palynology and Palaeoecology, Department of Geography and Environmental Sciences, Monash University, Clayton, Victoria 3168, Australia

Early season phytoplankton communities in both Omega and Taynaya Bays are characterized by diatoms sedimenting out of the overlying sea ice. Initial nitrate, phosphate and silicate levels are high and the bay waters are covered with ice and well mixed. In Taynaya Bay the ice cover is retained throughout the season while Omega Bay is ice free for 6–8 weeks. After ice break out in Omega Bay, the phytoplankton community changes from one dominated by diatoms to one dominated by the phytoflagellates, Pyramimonas spp., Cryptomonas sp. and Gymnodinium sp. In Taynaya Bay the ice remained and even though phytoflagellates became more common, diatoms still dominated. These differences in community composition result from differences in light climate, extent of stratification and nutrient levels.


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Home page
 The HoloceneHome page
A. McMinn, A. McMinn, H. Heijnisj, K. Harle, and G. McOrist
Late-Holocene climatic change recorded in sediment cores from Ellis Fjord, eastern Antarctica
The Holocene, April 1, 2001; 11(3): 291 - 300.
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