Phosphatase activity and organic phosphorus turnover on a high Arctic glacier
Arctic glacier surfaces harbour abundant microbial communities consisting mainly of heterotrophic and photoautotrophic bacteria. The microbes must cope with low concentrations of nutrients and with the fact that both the dissolved and debris-bound nutrient pools are dominated by organic phases. Here...
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ftdoajarticles:oai:doaj.org/article:12396b2082ef48369c1fe2f045e36f75 2023-05-15T14:57:08+02:00 Phosphatase activity and organic phosphorus turnover on a high Arctic glacier M. Stibal A. M. Anesio C. J. D. Blues M. Tranter 2009-05-01T00:00:00Z https://doaj.org/article/12396b2082ef48369c1fe2f045e36f75 EN eng Copernicus Publications http://www.biogeosciences.net/6/913/2009/bg-6-913-2009.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/12396b2082ef48369c1fe2f045e36f75 Biogeosciences, Vol 6, Iss 5, Pp 913-922 (2009) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2009 ftdoajarticles 2022-12-31T06:42:04Z Arctic glacier surfaces harbour abundant microbial communities consisting mainly of heterotrophic and photoautotrophic bacteria. The microbes must cope with low concentrations of nutrients and with the fact that both the dissolved and debris-bound nutrient pools are dominated by organic phases. Here we provide evidence that phosphorus (P) is deficient in the supraglacial environment on a Svalbard glacier, we quantify the enzymatic activity of phosphatases in the system and we estimate the contribution of the microbes to the cycling of the dominant organic P in the supraglacial environment. Incubation of cryoconite debris revealed significant phosphatase activity in the samples (19–67 nmol MUP g −1 h −1 ). It was inhibited by inorganic P during incubations and had its optimum at around 30°C. The phosphatase activity measured at near-in situ temperature and substrate concentration suggests that the available dissolved organic P can be turned over by microbes within ~3–11 h on the glacier surface. By contrast, the amount of potentially bioavailable debris-bound organic P is sufficient for a whole ablation season. However, it is apparent that some of this potentially bioavailable debris-bound P is not accessible to the microbes. Article in Journal/Newspaper Arctic glacier Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. Stibal A. M. Anesio C. J. D. Blues M. Tranter Phosphatase activity and organic phosphorus turnover on a high Arctic glacier |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Arctic glacier surfaces harbour abundant microbial communities consisting mainly of heterotrophic and photoautotrophic bacteria. The microbes must cope with low concentrations of nutrients and with the fact that both the dissolved and debris-bound nutrient pools are dominated by organic phases. Here we provide evidence that phosphorus (P) is deficient in the supraglacial environment on a Svalbard glacier, we quantify the enzymatic activity of phosphatases in the system and we estimate the contribution of the microbes to the cycling of the dominant organic P in the supraglacial environment. Incubation of cryoconite debris revealed significant phosphatase activity in the samples (19–67 nmol MUP g −1 h −1 ). It was inhibited by inorganic P during incubations and had its optimum at around 30°C. The phosphatase activity measured at near-in situ temperature and substrate concentration suggests that the available dissolved organic P can be turned over by microbes within ~3–11 h on the glacier surface. By contrast, the amount of potentially bioavailable debris-bound organic P is sufficient for a whole ablation season. However, it is apparent that some of this potentially bioavailable debris-bound P is not accessible to the microbes. |
format |
Article in Journal/Newspaper |
author |
M. Stibal A. M. Anesio C. J. D. Blues M. Tranter |
author_facet |
M. Stibal A. M. Anesio C. J. D. Blues M. Tranter |
author_sort |
M. Stibal |
title |
Phosphatase activity and organic phosphorus turnover on a high Arctic glacier |
title_short |
Phosphatase activity and organic phosphorus turnover on a high Arctic glacier |
title_full |
Phosphatase activity and organic phosphorus turnover on a high Arctic glacier |
title_fullStr |
Phosphatase activity and organic phosphorus turnover on a high Arctic glacier |
title_full_unstemmed |
Phosphatase activity and organic phosphorus turnover on a high Arctic glacier |
title_sort |
phosphatase activity and organic phosphorus turnover on a high arctic glacier |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/12396b2082ef48369c1fe2f045e36f75 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic glacier Svalbard |
genre_facet |
Arctic glacier Svalbard |
op_source |
Biogeosciences, Vol 6, Iss 5, Pp 913-922 (2009) |
op_relation |
http://www.biogeosciences.net/6/913/2009/bg-6-913-2009.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/12396b2082ef48369c1fe2f045e36f75 |
_version_ |
1766329227765874688 |