Metabolic activity and diversity of cryoconites in the Taylor Valley, Antarctica

129Citations
Citations of this article
114Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

Metabolic activity and biogeochemical diversity within cryoconites from the Canada, Commonwealth, Howard, and Hughes glaciers in the McMurdo Dry Valleys revealed the presence of a productive microbial refuge in this polar desert ecosystem. Fluorescent in situ hybridization, showed a high percentage of Cytophaga-Flavobacteria cells in, cryoconite sediments (87.2%), while Β-Proteobacterial cells dominated the ice overlying the sediment layer (54.2%). The biomass of bacterial cells in the sediments was also greater (4.82 μgC ml-1) than that in the overlying ice (0.18 μgC ml-1) and was related to bacterial roductivity (on the basis of thymidine incorporation), which ranged from 36 ng C 1-1 d-1 in the overlying ice to 3329 ng C 1-1 d-1 in the sediment-containing layers. Bacteria within both the sediments and overlying ice were able to actively incorporate and respire radio-labeled glucose, as well as 17 other dissolved organic carbon compounds. The cryoconites in the Taylor Valley support an active, diverse assemblage of organisms despite the fact that they may remain sealed from the atmosphere for decades. Given the density of the cryoconites in, the dry valleys (∼4-6% of ablation zone surfaces), flushing of the cryoconites during warm year could provide a vital nutrient and organic carbon source to the surrounding polar desert. Copyright 2007 by the American Geophysical Union.

Cite

CITATION STYLE

APA

Foreman, C. M., Sattler, B., Mikucki, J. A., Porazinska, D. L., & Priscu, J. C. (2007). Metabolic activity and diversity of cryoconites in the Taylor Valley, Antarctica. Journal of Geophysical Research: Biogeosciences, 112(4). https://doi.org/10.1029/2006JG000358

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free