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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Language: | English |
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2021
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/46637/ https://doi.org/10.1029/2020jg005706 https://nrl.northumbria.ac.uk/id/eprint/46637/1/2020JG005706.pdf https://nrl.northumbria.ac.uk/id/eprint/46637/8/2020JG005706.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:46637 2023-05-15T13:44:52+02:00 Marked Seasonal Changes in the Microbial Production, Community Composition and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic Hodson, A. J. Sabacka, M. Dayal, A. Edwards, A. Cook, J. Convey, P. Redeker, K. Pearce, David 2021-07-15 text https://nrl.northumbria.ac.uk/id/eprint/46637/ https://doi.org/10.1029/2020jg005706 https://nrl.northumbria.ac.uk/id/eprint/46637/1/2020JG005706.pdf https://nrl.northumbria.ac.uk/id/eprint/46637/8/2020JG005706.pdf en eng 2169-8953 https://nrl.northumbria.ac.uk/id/eprint/46637/1/2020JG005706.pdf https://nrl.northumbria.ac.uk/id/eprint/46637/8/2020JG005706.pdf Hodson, A. J., Sabacka, M., Dayal, A., Edwards, A., Cook, J., Convey, P., Redeker, K. and Pearce, David (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). ISSN 2169-8953 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2021 ftunivnorthumb https://doi.org/10.1029/2020jg005706 2022-09-25T06:14:06Z 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. Article in Journal/Newspaper Antarc* Antarctic Northumbria University, Newcastle: Northumbria Research Link (NRL) Antarctic Guano ENVELOPE(141.604,141.604,-66.775,-66.775) The Antarctic Journal of Geophysical Research: Biogeosciences 126 7 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Hodson, A. J. Sabacka, M. Dayal, A. Edwards, A. Cook, J. Convey, P. Redeker, K. Pearce, David Marked Seasonal Changes in the Microbial Production, Community Composition and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
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. |
format |
Article in Journal/Newspaper |
author |
Hodson, A. J. Sabacka, M. Dayal, A. Edwards, A. Cook, J. Convey, P. Redeker, K. Pearce, David |
author_facet |
Hodson, A. J. Sabacka, M. Dayal, A. Edwards, A. Cook, J. Convey, P. Redeker, K. Pearce, David |
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 |
2169-8953 |
publishDate |
2021 |
url |
https://nrl.northumbria.ac.uk/id/eprint/46637/ https://doi.org/10.1029/2020jg005706 https://nrl.northumbria.ac.uk/id/eprint/46637/1/2020JG005706.pdf https://nrl.northumbria.ac.uk/id/eprint/46637/8/2020JG005706.pdf |
long_lat |
ENVELOPE(141.604,141.604,-66.775,-66.775) |
geographic |
Antarctic Guano The Antarctic |
geographic_facet |
Antarctic Guano The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/46637/1/2020JG005706.pdf https://nrl.northumbria.ac.uk/id/eprint/46637/8/2020JG005706.pdf Hodson, A. J., Sabacka, M., Dayal, A., Edwards, A., Cook, J., Convey, P., Redeker, K. and Pearce, David (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). ISSN 2169-8953 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
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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1766207877855313920 |