Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland
Permafrost is degrading across regions of the Arctic, which can lead to increases in nutrient concentrations in surface freshwaters. The oligotrophic state of many Arctic lakes suggests that enhanced nutrient inputs may have important effects on these systems, but little is known about microbial nut...
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ftdoajarticles:oai:doaj.org/article:91878594682f4368b53c0830a9933d9d 2023-05-15T14:54:19+02:00 Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland B. Burpee J. E. Saros R. M. Northington K. S. Simon 2016-01-01T00:00:00Z https://doi.org/10.5194/bg-13-365-2016 https://doaj.org/article/91878594682f4368b53c0830a9933d9d EN eng Copernicus Publications http://www.biogeosciences.net/13/365/2016/bg-13-365-2016.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-13-365-2016 https://doaj.org/article/91878594682f4368b53c0830a9933d9d Biogeosciences, Vol 13, Iss 2, Pp 365-374 (2016) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/bg-13-365-2016 2022-12-30T22:38:34Z Permafrost is degrading across regions of the Arctic, which can lead to increases in nutrient concentrations in surface freshwaters. The oligotrophic state of many Arctic lakes suggests that enhanced nutrient inputs may have important effects on these systems, but little is known about microbial nutrient limitation patterns in these lakes. We investigated microbial extracellular enzyme activities (EEAs) to infer seasonal nutrient dynamics and limitation across 24 lakes in southwest Greenland during summer (June and July). From early to late summer, enzyme activities that indicate microbial carbon (C), nitrogen (N), and phosphorus (P) demand increased in both the epilimnia and hypolimnia by 74 % on average. Microbial investment in P acquisition was generally higher than that for N. Interactions among EEAs indicated that microbes were primarily P-limited. Dissolved organic matter (DOM, measured as dissolved organic carbon) was strongly and positively correlated with microbial P demand ( R 2 = 0.84 in July), while there were no relationships between DOM and microbial N demand. Microbial P limitation in June epilimnia ( R 2 = 0.67) and July hypolimnia ( R 2 = 0.57) increased with DOM concentration. The consistency of microbial P limitation from June to July was related to the amount of DOM present, with some low-DOM lakes becoming N-limited in July. Our results suggest that future changes in P or DOM inputs to these lakes are likely to alter microbial nutrient limitation patterns. Article in Journal/Newspaper Arctic Greenland permafrost Directory of Open Access Journals: DOAJ Articles Arctic Greenland Biogeosciences 13 2 365 374 |
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 B. Burpee J. E. Saros R. M. Northington K. S. Simon Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Permafrost is degrading across regions of the Arctic, which can lead to increases in nutrient concentrations in surface freshwaters. The oligotrophic state of many Arctic lakes suggests that enhanced nutrient inputs may have important effects on these systems, but little is known about microbial nutrient limitation patterns in these lakes. We investigated microbial extracellular enzyme activities (EEAs) to infer seasonal nutrient dynamics and limitation across 24 lakes in southwest Greenland during summer (June and July). From early to late summer, enzyme activities that indicate microbial carbon (C), nitrogen (N), and phosphorus (P) demand increased in both the epilimnia and hypolimnia by 74 % on average. Microbial investment in P acquisition was generally higher than that for N. Interactions among EEAs indicated that microbes were primarily P-limited. Dissolved organic matter (DOM, measured as dissolved organic carbon) was strongly and positively correlated with microbial P demand ( R 2 = 0.84 in July), while there were no relationships between DOM and microbial N demand. Microbial P limitation in June epilimnia ( R 2 = 0.67) and July hypolimnia ( R 2 = 0.57) increased with DOM concentration. The consistency of microbial P limitation from June to July was related to the amount of DOM present, with some low-DOM lakes becoming N-limited in July. Our results suggest that future changes in P or DOM inputs to these lakes are likely to alter microbial nutrient limitation patterns. |
format |
Article in Journal/Newspaper |
author |
B. Burpee J. E. Saros R. M. Northington K. S. Simon |
author_facet |
B. Burpee J. E. Saros R. M. Northington K. S. Simon |
author_sort |
B. Burpee |
title |
Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland |
title_short |
Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland |
title_full |
Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland |
title_fullStr |
Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland |
title_full_unstemmed |
Microbial nutrient limitation in Arctic lakes in a permafrost landscape of southwest Greenland |
title_sort |
microbial nutrient limitation in arctic lakes in a permafrost landscape of southwest greenland |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-365-2016 https://doaj.org/article/91878594682f4368b53c0830a9933d9d |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland permafrost |
genre_facet |
Arctic Greenland permafrost |
op_source |
Biogeosciences, Vol 13, Iss 2, Pp 365-374 (2016) |
op_relation |
http://www.biogeosciences.net/13/365/2016/bg-13-365-2016.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-13-365-2016 https://doaj.org/article/91878594682f4368b53c0830a9933d9d |
op_doi |
https://doi.org/10.5194/bg-13-365-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
2 |
container_start_page |
365 |
op_container_end_page |
374 |
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1766326034728222720 |