Seasonal fluctuations in microbial activity in Antarctic moss peat
The Signy Island terrestrial reference sites epitomize unpolluted maritime Antarctic tundra. The extreme transition from the harsh Antarctic winter to the milder summer facilitates studies of the effects of freeze-thaw cycles on microbial activity in moss peat. Seasonal monitoring of peat oxygen upt...
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1980
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Online Access: | http://nora.nerc.ac.uk/id/eprint/525068/ https://doi.org/10.1111/j.1095-8312.1980.tb00094.x |
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ftnerc:oai:nora.nerc.ac.uk:525068 2023-05-15T13:41:44+02:00 Seasonal fluctuations in microbial activity in Antarctic moss peat Wynn-Williams, D.D. 1980 http://nora.nerc.ac.uk/id/eprint/525068/ https://doi.org/10.1111/j.1095-8312.1980.tb00094.x unknown Linnean Society of London Wynn-Williams, D.D. 1980 Seasonal fluctuations in microbial activity in Antarctic moss peat. Biological Journal of the Linnean Society, 14 (1). 11-28. https://doi.org/10.1111/j.1095-8312.1980.tb00094.x <https://doi.org/10.1111/j.1095-8312.1980.tb00094.x> Botany Publication - Article PeerReviewed 1980 ftnerc https://doi.org/10.1111/j.1095-8312.1980.tb00094.x 2023-02-04T19:49:11Z The Signy Island terrestrial reference sites epitomize unpolluted maritime Antarctic tundra. The extreme transition from the harsh Antarctic winter to the milder summer facilitates studies of the effects of freeze-thaw cycles on microbial activity in moss peat. Seasonal monitoring of peat oxygen uptake showed a transient spring peak at c. 0oC, attributed to microbial utilization of dissolved organic carbon (DOC). After a more gradual temperature-linked summer increase, autumnal freeze-thaw cycles stimulated a final pre-winter peak. The transient climaxes were associated with blooms of saccharolytic yeasts and microfungi. The bacterial population stabilized after a spring increase but then diversified as DOC became rate-limiting. Effects of pre-monitored spring freeze-thaw cycles on late-winter peat cores were simulated in a Gilson respirometer. In vitro perturbations demonstrated the regulatory effects of DOC availability, water content and temperature on peat respiration and microflora! composition. Comparative respirometry and loss in tensile strength of interred cotton strips showed a difference in decomposer activity beneath a relatively dry Polytrichum-Chorisodontium turf and a wet Cattiergon-Cephalozielta carpet. This was associated with water content and anaerobiosis. Cellulolysis accelerated during the growing season and increased with depth, despite anaerobic conditions. Estimates of annual bryophyte decomposition are presented for use in an Antarctic ecosystem model. Article in Journal/Newspaper Antarc* Antarctic Signy Island Tundra Natural Environment Research Council: NERC Open Research Archive Antarctic Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Biological Journal of the Linnean Society 14 1 11 28 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Botany |
spellingShingle |
Botany Wynn-Williams, D.D. Seasonal fluctuations in microbial activity in Antarctic moss peat |
topic_facet |
Botany |
description |
The Signy Island terrestrial reference sites epitomize unpolluted maritime Antarctic tundra. The extreme transition from the harsh Antarctic winter to the milder summer facilitates studies of the effects of freeze-thaw cycles on microbial activity in moss peat. Seasonal monitoring of peat oxygen uptake showed a transient spring peak at c. 0oC, attributed to microbial utilization of dissolved organic carbon (DOC). After a more gradual temperature-linked summer increase, autumnal freeze-thaw cycles stimulated a final pre-winter peak. The transient climaxes were associated with blooms of saccharolytic yeasts and microfungi. The bacterial population stabilized after a spring increase but then diversified as DOC became rate-limiting. Effects of pre-monitored spring freeze-thaw cycles on late-winter peat cores were simulated in a Gilson respirometer. In vitro perturbations demonstrated the regulatory effects of DOC availability, water content and temperature on peat respiration and microflora! composition. Comparative respirometry and loss in tensile strength of interred cotton strips showed a difference in decomposer activity beneath a relatively dry Polytrichum-Chorisodontium turf and a wet Cattiergon-Cephalozielta carpet. This was associated with water content and anaerobiosis. Cellulolysis accelerated during the growing season and increased with depth, despite anaerobic conditions. Estimates of annual bryophyte decomposition are presented for use in an Antarctic ecosystem model. |
format |
Article in Journal/Newspaper |
author |
Wynn-Williams, D.D. |
author_facet |
Wynn-Williams, D.D. |
author_sort |
Wynn-Williams, D.D. |
title |
Seasonal fluctuations in microbial activity in Antarctic moss peat |
title_short |
Seasonal fluctuations in microbial activity in Antarctic moss peat |
title_full |
Seasonal fluctuations in microbial activity in Antarctic moss peat |
title_fullStr |
Seasonal fluctuations in microbial activity in Antarctic moss peat |
title_full_unstemmed |
Seasonal fluctuations in microbial activity in Antarctic moss peat |
title_sort |
seasonal fluctuations in microbial activity in antarctic moss peat |
publisher |
Linnean Society of London |
publishDate |
1980 |
url |
http://nora.nerc.ac.uk/id/eprint/525068/ https://doi.org/10.1111/j.1095-8312.1980.tb00094.x |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) |
geographic |
Antarctic Signy Island |
geographic_facet |
Antarctic Signy Island |
genre |
Antarc* Antarctic Signy Island Tundra |
genre_facet |
Antarc* Antarctic Signy Island Tundra |
op_relation |
Wynn-Williams, D.D. 1980 Seasonal fluctuations in microbial activity in Antarctic moss peat. Biological Journal of the Linnean Society, 14 (1). 11-28. https://doi.org/10.1111/j.1095-8312.1980.tb00094.x <https://doi.org/10.1111/j.1095-8312.1980.tb00094.x> |
op_doi |
https://doi.org/10.1111/j.1095-8312.1980.tb00094.x |
container_title |
Biological Journal of the Linnean Society |
container_volume |
14 |
container_issue |
1 |
container_start_page |
11 |
op_container_end_page |
28 |
_version_ |
1766155800356585472 |