Potential Activity of Subglacial Microbiota Transported to Anoxic River Delta Sediments
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Potential Activity of Subglacial Microbiota Transported to Anoxic River Delta Sediments. / Cameron, Karen A.; Stibal, Marek; Olsen, Nikoline S.; Mikkelsen, Andreas B.; Elberling, Bo; Jacobsen, Carsten S.
In: Microbial Ecology, Vol. 74, No. 1, 2017, p. 6-9.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Potential Activity of Subglacial Microbiota Transported to Anoxic River Delta Sediments
AU - Cameron, Karen A.
AU - Stibal, Marek
AU - Olsen, Nikoline S.
AU - Mikkelsen, Andreas B.
AU - Elberling, Bo
AU - Jacobsen, Carsten S.
N1 - CENPERMOA[2017]
PY - 2017
Y1 - 2017
N2 - The Watson River drains a portion of the SW Greenland ice sheet, transporting microbial communities from subglacial environments to a delta at the head of Søndre Strømfjord. This study investigates the potential activity and community shifts of glacial microbiota deposited and buried under layers of sediments within the river delta. A long-term (12-month) incubation experiment was established using Watson River delta sediment under anaerobic conditions, with and without CO2/H2 enrichment. Within CO2/H2-amended incubations, sulphate depletion and a shift in the microbial community to a 52% predominance of Desulfosporosinus meridiei by day 371 provides evidence for sulphate reduction. We found evidence of methanogenesis in CO2/H2-amended incubations within the first 5 months, with production rates of ~4 pmol g−1 d−1, which was likely performed by methanogenic Methanomicrobiales- and Methanosarcinales-related organisms. Later, a reduction in methane was observed to be paired with the depletion of sulphate, and we hypothesise that sulphate reduction out competed hydrogenotrophic methanogenesis. The structure and diversity of the original CO2/H2-amended incubation communities changed dramatically with a major shift in predominant community members and a decline in diversity and cell abundance. These results highlight the need for further investigations into the fate of subglacial microbiota within downstream environments.
AB - The Watson River drains a portion of the SW Greenland ice sheet, transporting microbial communities from subglacial environments to a delta at the head of Søndre Strømfjord. This study investigates the potential activity and community shifts of glacial microbiota deposited and buried under layers of sediments within the river delta. A long-term (12-month) incubation experiment was established using Watson River delta sediment under anaerobic conditions, with and without CO2/H2 enrichment. Within CO2/H2-amended incubations, sulphate depletion and a shift in the microbial community to a 52% predominance of Desulfosporosinus meridiei by day 371 provides evidence for sulphate reduction. We found evidence of methanogenesis in CO2/H2-amended incubations within the first 5 months, with production rates of ~4 pmol g−1 d−1, which was likely performed by methanogenic Methanomicrobiales- and Methanosarcinales-related organisms. Later, a reduction in methane was observed to be paired with the depletion of sulphate, and we hypothesise that sulphate reduction out competed hydrogenotrophic methanogenesis. The structure and diversity of the original CO2/H2-amended incubation communities changed dramatically with a major shift in predominant community members and a decline in diversity and cell abundance. These results highlight the need for further investigations into the fate of subglacial microbiota within downstream environments.
KW - Meltwater export
KW - Methane oxidation
KW - Methanogenesis
KW - River delta
KW - Subglacial environment
KW - Sulphate reduction
U2 - 10.1007/s00248-016-0926-2
DO - 10.1007/s00248-016-0926-2
M3 - Journal article
C2 - 28070677
AN - SCOPUS:85008698564
VL - 74
SP - 6
EP - 9
JO - Microbial Ecology
JF - Microbial Ecology
SN - 0095-3628
IS - 1
ER -
ID: 177189829