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The biogeochemistry of meltwater habitats in the Darwin Glacier region (80°S), Victoria Land, Antarctica

Published online by Cambridge University Press:  02 December 2010

J. Webster-Brown*
Affiliation:
Waterways Centre for Freshwater Management, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
M. Gall
Affiliation:
NIWA, Christchurch, New Zealand
J. Gibson
Affiliation:
Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Hobart, Australia
S. Wood
Affiliation:
Cawthron Institute, Nelson, New Zealand
I. Hawes
Affiliation:
Aquatic Research Solutions Ltd, Cambridge, New Zealand

Abstract

Meltwater habitats in the Darwin Glacier region, Victoria Land (80°S), were sampled in December 2007 and January 2009 to characterize their microbial and metazoan ecology, nutrient status and geochemistry. Targeted areas included terrestrial ponds of the Grant Valley, Lake Wellman, Tentacle Ridge and Diamond Hill, and supraglacial ponds and cryoconite holes of the lower Darwin Glacier. Geochemistry ranged from Na-Cl dominated terrestrial ponds to Na-HCO3 dominated, dilute supraglacial ponds and cryoconites. All showed the nitrate enrichment typical of inland ponds of Victoria Land (up to 13 g.l-1 NO3-N), with some precipitating nitratine (NaNO3) salt. Elevated pH indicated ongoing photosynthetic processes. Benthic microbial mats were thin and poorly developed, dominated by oscillatoriacean cyanobacteria. Nitrogen-fixing genera were generally absent and diatoms were rare. A large (20 μm long) Cyanothece species was the most abundant cyanobacterium in the water and in sediments of the cryoconites. DNA finger-printing identified distinct differences in cyanobacterial and bacterial community structure between the cryoconites, terrestrial ponds and ponds on glacial margins. Eleven metazoan species were identified, with rotifers being the most abundant. Pond substrate (terrestrial rock, ice-cored moraine or supraglacial ice) proved to be a more significant influence on biogeochemistry than other aspects of geography or climatic conditions.

Type
Research Article
Copyright
Copyright © Antarctic Science Ltd 2010

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