Abstract
Microorganisms have a crucial role to play in the cycling of nutrients within glacial environments. These systems are often nutrient-limited, and so biogeochemical reactions, which ensure the availability of nutrients for microbial communities, are critical for the maintenance of these systems. This study uses molecular biology to characterise the supraglacial cryoconite microbial communities that are capable of cycling carbon and nitrogen in a range of glacial environments. Organisms with the potential to photosynthesise were identified, including Cyanobacteria, Actinobacteria, Betaproteobacteria, Stramenopiles and Haptophyceae. Organisms with the potential to perform nitrification and denitrification processes were also identified and featured Betaproteobacteria, Alphaproteobacteria, Thaumarchaeota and Cyanobacteria. While it is unlikely that the chemical and physical parameters of the supraglacial environment will facilitate optimal rates of all of the nitrogen-related biogeochemical processes, the transport of these cryoconite communities to downstream locations, where more favourable conditions may prevail, will perhaps provide a valuable inoculation of microorganisms with the genetic potential to catalyse these reactions elsewhere.
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Acknowledgments
KC was funded by a Ph.D. studentship awarded by the University of Sheffield. This research was supported by a Leverhulme Research Fellowship (RF/4/RFG/2007/0398) awarded to AJH and by the NERC for providing access to the NERC Arctic Research Station. The authors would like to acknowledge the support of Nick Cox, Steve Marshall and Rob Smith at the NERC Arctic Station, Ny Ålesund, Svalbard and Monica Kristensen and Jacob Yde for support during Svalbard and Greenland fieldwork. KC was supported during manuscript preparation by NSF-OPP grant 0739783 (awarded to Karen Junge) and NSF-OPP grant 1023462 (awarded to Karen Junge and Ronald Sletten).
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Cameron, K.A., Hodson, A.J. & Osborn, A.M. Carbon and nitrogen biogeochemical cycling potentials of supraglacial cryoconite communities. Polar Biol 35, 1375–1393 (2012). https://doi.org/10.1007/s00300-012-1178-3
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DOI: https://doi.org/10.1007/s00300-012-1178-3