10.6084/m9.figshare.1011894.v1
Jakub D Zarsky
Jakub
D Zarsky
Marek Stibal
Marek
Stibal
Andy Hodson
Andy
Hodson
Birgit Sattler
Birgit
Sattler
Morten Schostag
Morten
Schostag
Lars H Hansen
Lars
H Hansen
Carsten S Jacobsen
Carsten
S Jacobsen
Roland Psenner
Roland
Psenner
RDA biplot visualizing the effects of physical environmental variables (dashed arrows for quantitative and filled triangles for categories) on the chemistry (solid arrows) of cryoconite holes on Aldegondabreen
IOP Publishing
2013
Arctic glacier
nitrogen cycling
supraglacial environments
prokaryotic microbes
valley glacier
surface debris
cryoconite holes
geochemical analysis
glacier surface
bird colonies
aldegondabreen
polymerase chain reactions
surface debris particles
supraglacial meltwater flow
16 S
Environmental Science
2013-09-11 00:00:00
Figure
https://iop.figshare.com/articles/figure/_RDA_biplot_visualizing_the_effects_of_physical_environmental_variables_dashed_arrows_for_quantitati/1011894
<p><strong>Figure 3.</strong> RDA biplot visualizing the effects of physical environmental variables (dashed arrows for quantitative and filled triangles for categories) on the chemistry (solid arrows) of cryoconite holes on Aldegondabreen. Only significant factors (<em>p</em> < 0.01) are shown.</p> <p><strong>Abstract</strong></p> <p>The aggregation of surface debris particles on melting glaciers into larger units (cryoconite) provides microenvironments for various microorganisms and metabolic processes. Here we investigate the microbial community on the surface of Aldegondabreen, a valley glacier in Svalbard which is supplied with carbon and nutrients from different sources across its surface, including colonies of seabirds. We used a combination of geochemical analysis (of surface debris, ice and meltwater), quantitative polymerase chain reactions (targeting the 16S ribosomal ribonucleic acid and <em>amoA</em> genes), pyrosequencing and multivariate statistical analysis to suggest possible factors driving the ecology of prokaryotic microbes on the surface of Aldegondabreen and their potential role in nitrogen cycling. The combination of high nutrient input with subsidy from the bird colonies, supraglacial meltwater flow and the presence of fine, clay-like particles supports the formation of centimetre-scale cryoconite aggregates in some areas of the glacier surface. We show that a diverse microbial community is present, dominated by the cyanobacteria, Proteobacteria, Bacteroidetes, and Actinobacteria, that are well-known in supraglacial environments. Importantly, ammonia-oxidizing archaea were detected in the aggregates for the first time on an Arctic glacier.</p>