Meltwater export of prokaryotic cells from the Greenland ice sheet

Karen Cameron, Marek Stibal, Jon Hawkings, Andreas Mikkelsen, Jon Telling, Tyler J. Kohler, Erkin Gözdereliler, Jakub D. Zarsky, Jemma L. Wadham, Carsten Jacobsen

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

35 Dyfyniadau(SciVal)
187 Wedi eu Llwytho i Lawr (Pure)


Microorganisms are flushed from the Greenland Ice Sheet (GrIS) where they may contribute towards the nutrient cycling and community compositions of downstream ecosystems. We investigate meltwater microbial assemblages as they exit the GrIS from a large outlet glacier, and as they enter a downstream river delta during the record melt year of 2012. Prokaryotic abundance, flux and community composition was studied, and factors affecting community structures were statistically considered. The mean concentration of cells exiting the ice sheet was 8.30 × 104 cells mL-1 and we estimate that ∼1.02 × 1021 cells were transported to the downstream fjord in 2012, equivalent to 30.95 Mg of carbon. Prokaryotic microbial assemblages were dominated by Proteobacteria, Bacteroidetes, and Actinobacteria. Cell concentrations and community compositions were stable throughout the sample period, and were statistically similar at both sample sites. Based on our observations, we argue that the subglacial environment is the primary source of the river-transported microbiota, and that cell export from the GrIS is dependent on discharge. We hypothesise that the release of subglacial microbiota to downstream ecosystems will increase as freshwater flux from the GrIS rises in a warming world.
Iaith wreiddiolSaesneg
Tudalennau (o-i)524-534
Nifer y tudalennau11
CyfnodolynEnvironmental Microbiology
Rhif cyhoeddi2
Dyddiad ar-lein cynnar04 Awst 2016
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 01 Chwef 2017

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