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

Citation

Webster-Brown, J and Gall, M and Gibson, J and Wood, S and Hawes, I, The biogeochemistry of meltwater habitats in the Darwin Glacier region (80 degrees S), Victoria Land, Antarctica, Antarctic Science, 22, (6) pp. 646-661. ISSN 0954-1020 (2010) [Refereed Article]

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Copyright 2010 Antarctic Science Ltd

DOI: doi:10.1017/S0954102010000787

Abstract

Meltwater habitats in the Darwin Glacier region, Victoria Land (808S), 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 mm 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.

Item Details

Item Type:Refereed Article
Keywords:cryoconite, cyanobacteria, metazoa, nitrate, supraglacial
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Landscape Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Gibson, J (Dr John Gibson)
ID Code:66531
Year Published:2010
Web of Science® Times Cited:17
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2011-02-01
Last Modified:2012-08-03
Downloads:1 View Download Statistics

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