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The plankton of a large oligotrophic fresh-water Antarctic lake

Citation

Laybourn-Parry, J and Marchant, HJ and Brown, PE, The plankton of a large oligotrophic fresh-water Antarctic lake, Journal of Plankton Research, 13, (6) pp. 1137-1150. ISSN 0142-7873 (1991) [Refereed Article]

DOI: doi:10.1093/plankt/13.6.1137

Abstract

The planktonic community of Crooked Lake, a large freshwater lake in the Vestfold Hills, Antarctica was investigated during the austral summer in 1990. Very low levels of chlorophyll a ranging between mean values of 0 29 and 1.8 μl-1 were recorded. The phytoplankton was largely made up of coloured flagellates, including single species of Chlamydomonas, Ochromonas and Pendimum, which occurred in low concentrations (23.8× 102-47.3 ×102 l-1). Heterotrophic colourless flagellates, including Paraphysomonas vestita, were also relatively sparse (2.1× 102-21.3×102 l-1). Ciliated protozoans were particularly poorly represented. Only three species occurred reaching densities of ∼1001-1, and among them the mixotrophic species Strombidium vinde was the most common. A single species of heliozoan Actinosphaerium and relatively large numbers of naked amoebae were the sarcodine representatives The protistan community and the bacteria were concentrated into microbial consortia associated with floes of paniculate organic matter probably derived from the benthic algal mat. Of the two microcrustacean zooplankters recorded from the lake only Daphniopsis studeri was found breeding in the plankton in very low numbers. The behavioural and physiological adaptations of the organisms inhabiting this extremely oligotrophic environment are discussed. © 1991 Oxford University Press.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Laybourn-Parry, J (Professor Johanna Laybourn-Parry)
ID Code:49481
Year Published:1991
Web of Science® Times Cited:53
Deposited By:Research Division
Deposited On:2007-12-14
Last Modified:2011-11-16
Downloads:0

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