Denitrification and anammox activity in Arctic marine sediments
We measured rates of N2 production through anaerobic NH 4 + oxidation with NO 2 −(anammox) and denitrification in permanently cold (from −1.7°C to 4°C) sediments off the east and west coasts of Greenland. The investigated sites (36– to 100–m water depth) covered sediments in which carbon contents ra...
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crwiley:10.4319/lo.2004.49.5.1493 2024-06-23T07:50:15+00:00 Denitrification and anammox activity in Arctic marine sediments Rysgaard, Søren Glud, Ronnie Nøhr Risgaard-Petersen, Nils Dalsgaard, Tage 2004 http://dx.doi.org/10.4319/lo.2004.49.5.1493 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2004.49.5.1493 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2004.49.5.1493 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 49, issue 5, page 1493-1502 ISSN 0024-3590 1939-5590 journal-article 2004 crwiley https://doi.org/10.4319/lo.2004.49.5.1493 2024-06-13T04:20:40Z We measured rates of N2 production through anaerobic NH 4 + oxidation with NO 2 −(anammox) and denitrification in permanently cold (from −1.7°C to 4°C) sediments off the east and west coasts of Greenland. The investigated sites (36– to 100–m water depth) covered sediments in which carbon contents ranged from 0.3 to 3.2 dry weight %, O 2 uptake rates ranged from 3.4 to 8.3 mmol m −2 d −1 , O 2 penetration depths ranged from 0.25 to 1.70 cm, and bottom‐water NO 3 −concentrations ranged from 0.3 to 15.3 µmol L −1 . Total N 2 production was 34–344 µmol N m −2 d −1 , of which anammox accounted for 1–92 µmol N m −2 d −1 (1–35% of total) and denitrification for 33–265 µmol N m −2 d −1 . At one of the high‐Arctic sites, anammox activity had an optimum temperature ( T opt ) of 12°C, while that of bacterial denitrification was 24°C. According to the classical temperature scheme for metabolic growth, the anammox response was psychrophilic, while denitrification was psychrotrophic. Although T opt was considerably higher than in situ temperatures, rates of denitrification and anammox were still high at −1.3°C, reaching 17% and 40%, respectively, of those found at T opt . The activation energies, E a , of anammox and denitrification were 51.0 and 60.6 kJ mol −1 , respectively, and the corresponding Q 10 values were 2.2 and 2.4. Rates of anammox were linearly correlated with bottom‐water NO 3 −concentrations ( r 2 = 0.96, p < 0.0001, n = 11) at the investigated sites. We suggest that the slow‐growing anammox bacteria are favored in sediments with high and stable NO 3 −conditions. This may be a general pattern in deeper waters at other latitudes as well. Article in Journal/Newspaper Arctic Greenland Wiley Online Library Arctic Greenland Limnology and Oceanography 49 5 1493 1502 |
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Wiley Online Library |
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English |
description |
We measured rates of N2 production through anaerobic NH 4 + oxidation with NO 2 −(anammox) and denitrification in permanently cold (from −1.7°C to 4°C) sediments off the east and west coasts of Greenland. The investigated sites (36– to 100–m water depth) covered sediments in which carbon contents ranged from 0.3 to 3.2 dry weight %, O 2 uptake rates ranged from 3.4 to 8.3 mmol m −2 d −1 , O 2 penetration depths ranged from 0.25 to 1.70 cm, and bottom‐water NO 3 −concentrations ranged from 0.3 to 15.3 µmol L −1 . Total N 2 production was 34–344 µmol N m −2 d −1 , of which anammox accounted for 1–92 µmol N m −2 d −1 (1–35% of total) and denitrification for 33–265 µmol N m −2 d −1 . At one of the high‐Arctic sites, anammox activity had an optimum temperature ( T opt ) of 12°C, while that of bacterial denitrification was 24°C. According to the classical temperature scheme for metabolic growth, the anammox response was psychrophilic, while denitrification was psychrotrophic. Although T opt was considerably higher than in situ temperatures, rates of denitrification and anammox were still high at −1.3°C, reaching 17% and 40%, respectively, of those found at T opt . The activation energies, E a , of anammox and denitrification were 51.0 and 60.6 kJ mol −1 , respectively, and the corresponding Q 10 values were 2.2 and 2.4. Rates of anammox were linearly correlated with bottom‐water NO 3 −concentrations ( r 2 = 0.96, p < 0.0001, n = 11) at the investigated sites. We suggest that the slow‐growing anammox bacteria are favored in sediments with high and stable NO 3 −conditions. This may be a general pattern in deeper waters at other latitudes as well. |
format |
Article in Journal/Newspaper |
author |
Rysgaard, Søren Glud, Ronnie Nøhr Risgaard-Petersen, Nils Dalsgaard, Tage |
spellingShingle |
Rysgaard, Søren Glud, Ronnie Nøhr Risgaard-Petersen, Nils Dalsgaard, Tage Denitrification and anammox activity in Arctic marine sediments |
author_facet |
Rysgaard, Søren Glud, Ronnie Nøhr Risgaard-Petersen, Nils Dalsgaard, Tage |
author_sort |
Rysgaard, Søren |
title |
Denitrification and anammox activity in Arctic marine sediments |
title_short |
Denitrification and anammox activity in Arctic marine sediments |
title_full |
Denitrification and anammox activity in Arctic marine sediments |
title_fullStr |
Denitrification and anammox activity in Arctic marine sediments |
title_full_unstemmed |
Denitrification and anammox activity in Arctic marine sediments |
title_sort |
denitrification and anammox activity in arctic marine sediments |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.4319/lo.2004.49.5.1493 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2004.49.5.1493 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2004.49.5.1493 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland |
genre_facet |
Arctic Greenland |
op_source |
Limnology and Oceanography volume 49, issue 5, page 1493-1502 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2004.49.5.1493 |
container_title |
Limnology and Oceanography |
container_volume |
49 |
container_issue |
5 |
container_start_page |
1493 |
op_container_end_page |
1502 |
_version_ |
1802641125417156608 |