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High zooplankton diversity in the extreme environments of the McMurdo Dry Valley lakes, Antarctica

Published online by Cambridge University Press:  26 October 2011

Lars-Anders Hansson ,
Samuel Hylander ,
Herbert J.G. Dartnall ,
Sven Lidström  and
Jan-Erik Svensson
Lars-Anders Hansson*
Affiliation:
Institute of Biology/Aquatic Ecology, Ecology Building, Lund University, SE-223 62 Lund, Sweden
Samuel Hylander
Affiliation:
Institute of Biology/Aquatic Ecology, Ecology Building, Lund University, SE-223 62 Lund, Sweden
Herbert J.G. Dartnall
Affiliation:
Department of Biological Sciences, Macquarie University, Sydney 2109, Australia
Sven Lidström
Affiliation:
Swedish Polar Research Programme, PO Box 50005, SE-104 05 Stockholm, Sweden
Jan-Erik Svensson
Affiliation:
Medins Biologi, SE-435 33 Mölnlycke, Sweden
*
lars-anders.hansson@biol.lu.se
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Abstract

The McMurdo Dry Valley lakes of Antarctica constitute some of the harshest and most isolated freshwater environments on Earth which might be expected to limit the biogeographical expansion of many organisms. Despite this, we found that the biodiversity of rotifer zooplankton is the highest ever recorded on the Antarctic mainland. We identified in total nine rotifer taxa, of which six are new to the Antarctic continent, in Lake Hoare, and also the first sub-adult crustacean copepod belonging to the genus Boeckella. A possible explanation for the high biodiversity is that many of the recorded species have arrived in the region in relatively recent times and then established invasive populations, suggesting that their distribution pattern was previously limited only by biogeographical borders. Interestingly, we show that the cosmopolitan rotifer taxa identified are relatively abundant, suggesting that they have established viable populations. Hence, our study suggests that the biogeographical maps have to be redrawn for several species.

Keywords

biodiversityBoeckellacopepodinvasionrotiferspecies-richness
Type
Biological Sciences
Information
Antarctic Science , Volume 24 , Issue 2 , 28 February 2012 , pp. 131 - 138
Copyright
Copyright © Antarctic Science Ltd 2011

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