Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic
We describe seasonal changes in the biogeochemistry, microbial community and ecosystem production of two glacial snowpacks in the maritime Antarctic during a cold summer. Frequent snowfall and low, intermittent melt on the glaciers suppressed surface photosynthesis and promoted net heterotrophy. Con...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Online Access: | https://hdl.handle.net/11250/2799849 https://doi.org/10.1029/2020JG005706 |
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fthsvestlandet:oai:hvlopen.brage.unit.no:11250/2799849 2024-03-03T08:39:14+00:00 Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic Hodson, A.J. Šabacká, Marie Dayal, A. Edwards, Arwyn Cook, J. Convey, Peter Redeker, Kelly Robert Pearce, D.A. Antarctica, Signy Island 2021 application/pdf https://hdl.handle.net/11250/2799849 https://doi.org/10.1029/2020JG005706 eng eng American Geophysical Union Norges forskningsråd: 288402 Hodson, A. J., Sabacka, M., Dayal, A., Edwards, A., Cook, J., Convey, P., Redeker, K., & Pearce, D. A. (2021). Marked seasonal changes in the microbial production, community composition, and biogeochemistry of glacial snowpack ecosystems in the maritime antarctic. Journal of Geophysical Research: Biogeosciences, 126(7). urn:issn:2169-8953 https://hdl.handle.net/11250/2799849 https://doi.org/10.1029/2020JG005706 cristin:1928529 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2021 The Authors. 1-18 126 Journal of Geophysical Research (JGR): Biogeosciences 7 Peer reviewed Journal article 2021 fthsvestlandet https://doi.org/10.1029/2020JG005706 2024-02-02T12:40:39Z We describe seasonal changes in the biogeochemistry, microbial community and ecosystem production of two glacial snowpacks in the maritime Antarctic during a cold summer. Frequent snowfall and low, intermittent melt on the glaciers suppressed surface photosynthesis and promoted net heterotrophy. Concentrations of autotrophic cells (algae and cyanobacteria) were therefore low (average: 150–500 cells mL−1), and short-term estimates of primary production were almost negligible in early summer (<0.1 μg C L−1 d−1). However, order of magnitude increases in Chlorophyll a concentrations occurred later, especially within the mid-snowpack and ice layers below. Short-term primary production increased to ca. 1 μg C L−1 d−1 in mid-summer, and reached 53.1 μg C L−1 d−1 in a mid-snow layer close to an active penguin colony. However, there were significantly more bacteria than autotrophs in the snow (typically 103 cells mL−1, but >104 cells mL−1 in basal ice near the penguin colony). The ratio of bacteria to autotrophs also increased throughout the summer, and short-term bacterial production rates (0.2–2000 μg C L−1 d−1) usually exceeded primary production, especially in basal ice (10–1400 μg C L−1 d−1). The basal ice represented the least diverse but most productive habitat, and a striking feature was its low pH (down to 3.3). Furthermore, all of the overlying snow cover became increasingly acidic as the summer season progressed, which is attributed to enhanced emissions from wet guano in the penguin colony. The study demonstrates that active microbial communities can be expected, even when snowmelt is intermittent in the Antarctic summer. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctica Signy Island Høgskulen på Vestlandet: HVL Open Antarctic The Antarctic Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Guano ENVELOPE(141.604,141.604,-66.775,-66.775) Journal of Geophysical Research: Biogeosciences 126 7 |
institution |
Open Polar |
collection |
Høgskulen på Vestlandet: HVL Open |
op_collection_id |
fthsvestlandet |
language |
English |
description |
We describe seasonal changes in the biogeochemistry, microbial community and ecosystem production of two glacial snowpacks in the maritime Antarctic during a cold summer. Frequent snowfall and low, intermittent melt on the glaciers suppressed surface photosynthesis and promoted net heterotrophy. Concentrations of autotrophic cells (algae and cyanobacteria) were therefore low (average: 150–500 cells mL−1), and short-term estimates of primary production were almost negligible in early summer (<0.1 μg C L−1 d−1). However, order of magnitude increases in Chlorophyll a concentrations occurred later, especially within the mid-snowpack and ice layers below. Short-term primary production increased to ca. 1 μg C L−1 d−1 in mid-summer, and reached 53.1 μg C L−1 d−1 in a mid-snow layer close to an active penguin colony. However, there were significantly more bacteria than autotrophs in the snow (typically 103 cells mL−1, but >104 cells mL−1 in basal ice near the penguin colony). The ratio of bacteria to autotrophs also increased throughout the summer, and short-term bacterial production rates (0.2–2000 μg C L−1 d−1) usually exceeded primary production, especially in basal ice (10–1400 μg C L−1 d−1). The basal ice represented the least diverse but most productive habitat, and a striking feature was its low pH (down to 3.3). Furthermore, all of the overlying snow cover became increasingly acidic as the summer season progressed, which is attributed to enhanced emissions from wet guano in the penguin colony. The study demonstrates that active microbial communities can be expected, even when snowmelt is intermittent in the Antarctic summer. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Hodson, A.J. Šabacká, Marie Dayal, A. Edwards, Arwyn Cook, J. Convey, Peter Redeker, Kelly Robert Pearce, D.A. |
spellingShingle |
Hodson, A.J. Šabacká, Marie Dayal, A. Edwards, Arwyn Cook, J. Convey, Peter Redeker, Kelly Robert Pearce, D.A. Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic |
author_facet |
Hodson, A.J. Šabacká, Marie Dayal, A. Edwards, Arwyn Cook, J. Convey, Peter Redeker, Kelly Robert Pearce, D.A. |
author_sort |
Hodson, A.J. |
title |
Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic |
title_short |
Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic |
title_full |
Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic |
title_fullStr |
Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic |
title_full_unstemmed |
Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic |
title_sort |
marked seasonal changes in the microbial production, community composition, and biogeochemistry of glacial snowpack ecosystems in the maritime antarctic |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2799849 https://doi.org/10.1029/2020JG005706 |
op_coverage |
Antarctica, Signy Island |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(141.604,141.604,-66.775,-66.775) |
geographic |
Antarctic The Antarctic Signy Island Guano |
geographic_facet |
Antarctic The Antarctic Signy Island Guano |
genre |
Antarc* Antarctic Antarctica Signy Island |
genre_facet |
Antarc* Antarctic Antarctica Signy Island |
op_source |
1-18 126 Journal of Geophysical Research (JGR): Biogeosciences 7 |
op_relation |
Norges forskningsråd: 288402 Hodson, A. J., Sabacka, M., Dayal, A., Edwards, A., Cook, J., Convey, P., Redeker, K., & Pearce, D. A. (2021). Marked seasonal changes in the microbial production, community composition, and biogeochemistry of glacial snowpack ecosystems in the maritime antarctic. Journal of Geophysical Research: Biogeosciences, 126(7). urn:issn:2169-8953 https://hdl.handle.net/11250/2799849 https://doi.org/10.1029/2020JG005706 cristin:1928529 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2021 The Authors. |
op_doi |
https://doi.org/10.1029/2020JG005706 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
126 |
container_issue |
7 |
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1792494656027623424 |