Year-Round Variation in Bryophyte-Associated Nitrogen Fixation in the Arctic Year-Round Variation in Bryophyte-Associated Nitrogen Fixation in the Arctic
In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N 2 -fixing microorganisms (diazotrophs) that play a crucial role in the N cycle of these ecosystems. Despite their importance, how the bryophyte-associated N 2 -fixation varies across specie...
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| Published in: | Ecosystems (New York) Vol. 29; no. 1; p. 7 |
|---|---|
| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
New York
Springer US
01.02.2026
Springer Nature B.V |
| Subjects: | |
| ISSN: | 1432-9840, 1435-0629, 1435-0629 |
| Online Access: | Get full text |
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| Abstract | In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N
2
-fixing microorganisms (diazotrophs) that play a crucial role in the N cycle of these ecosystems. Despite their importance, how the bryophyte-associated N
2
-fixation varies across species and seasons (summer, autumn, winter, and spring) remains poorly understood. We measured N
2
-fixation rates for 10 bryophyte species in situ throughout the entire year in the Arctic with additional incubations to verify the method. We measured positive N
2
-fixation during most of the year, except for the coldest period (February). The species growing in the wettest conditions (
Sphagnum
spp.) had the highest N
2
-fixation rates in summer, while bryophytes in drier conditions peaked in N
2
-fixation rates in spring and autumn. The seasonal variation in N
2
-fixation activity was pronounced, but similar patterns were found among different species. This study reveals that bryophyte-associated N
2
-fixation in northern ecosystems is larger than previously assumed, as it occurs over a more extended part of the year than previously inferred. Furthermore, the importance of bryophyte-associated diazotrophs cannot be quantified without considering both the diversity of bryophytes and their variation in N
2
-fixing seasonal activity patterns. Both future changes in climatic conditions and biodiversity of bryophytes can thus have large implications for the N cycle in arctic regions. |
|---|---|
| AbstractList | In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N2-fixing microorganisms (diazotrophs) that play a crucial role in the N cycle of these ecosystems. Despite their importance, how the bryophyte-associated N2-fixation varies across species and seasons (summer, autumn, winter, and spring) remains poorly understood. We measured N2-fixation rates for 10 bryophyte species in situ throughout the entire year in the Arctic with additional incubations to verify the method. We measured positive N2-fixation during most of the year, except for the coldest period (February). The species growing in the wettest conditions (Sphagnum spp.) had the highest N2-fixation rates in summer, while bryophytes in drier conditions peaked in N2-fixation rates in spring and autumn. The seasonal variation in N2-fixation activity was pronounced, but similar patterns were found among different species. This study reveals that bryophyte-associated N2-fixation in northern ecosystems is larger than previously assumed, as it occurs over a more extended part of the year than previously inferred. Furthermore, the importance of bryophyte-associated diazotrophs cannot be quantified without considering both the diversity of bryophytes and their variation in N2-fixing seasonal activity patterns. Both future changes in climatic conditions and biodiversity of bryophytes can thus have large implications for the N cycle in arctic regions. In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N 2 -fixing microorganisms (diazotrophs) that play a crucial role in the N cycle of these ecosystems. Despite their importance, how the bryophyte-associated N 2 -fixation varies across species and seasons (summer, autumn, winter, and spring) remains poorly understood. We measured N 2 -fixation rates for 10 bryophyte species in situ throughout the entire year in the Arctic with additional incubations to verify the method. We measured positive N 2 -fixation during most of the year, except for the coldest period (February). The species growing in the wettest conditions ( Sphagnum spp.) had the highest N 2 -fixation rates in summer, while bryophytes in drier conditions peaked in N 2 -fixation rates in spring and autumn. The seasonal variation in N 2 -fixation activity was pronounced, but similar patterns were found among different species. This study reveals that bryophyte-associated N 2 -fixation in northern ecosystems is larger than previously assumed, as it occurs over a more extended part of the year than previously inferred. Furthermore, the importance of bryophyte-associated diazotrophs cannot be quantified without considering both the diversity of bryophytes and their variation in N 2 -fixing seasonal activity patterns. Both future changes in climatic conditions and biodiversity of bryophytes can thus have large implications for the N cycle in arctic regions. In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N 2 -fixing microorganisms (diazotrophs) that play a crucial role in the N cycle of these ecosystems. Despite their importance, how the bryophyte-associated N 2 -fixation varies across species and seasons (summer, autumn, winter, and spring) remains poorly understood. We measured N 2 -fixation rates for 10 bryophyte species in situ throughout the entire year in the Arctic with additional incubations to verify the method. We measured positive N 2 -fixation during most of the year, except for the coldest period (February). The species growing in the wettest conditions ( Sphagnum spp.) had the highest N 2 -fixation rates in summer, while bryophytes in drier conditions peaked in N 2 -fixation rates in spring and autumn. The seasonal variation in N 2 -fixation activity was pronounced, but similar patterns were found among different species. This study reveals that bryophyte-associated N 2 -fixation in northern ecosystems is larger than previously assumed, as it occurs over a more extended part of the year than previously inferred. Furthermore, the importance of bryophyte-associated diazotrophs cannot be quantified without considering both the diversity of bryophytes and their variation in N 2 -fixing seasonal activity patterns. Both future changes in climatic conditions and biodiversity of bryophytes can thus have large implications for the N cycle in arctic regions. |
| ArticleNumber | 7 |
| Author | Andersen, Emil Alexander Sherman Lett, Signe Olofsson, Johan Michelsen, Anders Dorrepaal, Ellen |
| Author_xml | – sequence: 1 givenname: Emil Alexander Sherman orcidid: 0000-0003-3745-5044 surname: Andersen fullname: Andersen, Emil Alexander Sherman email: ea.sherman@proton.me organization: Climate Impacts Research Centre, Department of Ecology and Environmental Sciences, Umeå University – sequence: 2 givenname: Signe orcidid: 0000-0003-2515-8413 surname: Lett fullname: Lett, Signe organization: Forest and Bioresources, Department of Geosciences and Natural Resource Management, University of Copenhagen, Terrestrial Ecology Section, Department of Biology, University of Copenhagen – sequence: 3 givenname: Anders orcidid: 0000-0002-9541-8658 surname: Michelsen fullname: Michelsen, Anders organization: Terrestrial Ecology Section, Department of Biology, University of Copenhagen – sequence: 4 givenname: Ellen orcidid: 0000-0002-0523-2471 surname: Dorrepaal fullname: Dorrepaal, Ellen organization: Climate Impacts Research Centre, Department of Ecology and Environmental Sciences, Umeå University – sequence: 5 givenname: Johan orcidid: 0000-0002-6943-1218 surname: Olofsson fullname: Olofsson, Johan organization: Department of Ecology and Environmental Sciences, Umeå University |
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| Cites_doi | 10.1111/j.1469-8137.1977.tb02220.x 10.1093/jxb/eri309 10.1073/pnas.1314284111 10.1007/s00248-014-0534-y 10.1002/ecs2.2117 10.1080/00040851.1986.12004075 10.1128/aem.31.5.640-647.1976 10.1111/j.1469-8137.2012.04254.x 10.32614/RJ-2017-066 10.1128/aem.57.2.622-624.1991 10.3955/046.090.0407 10.1111/nph.18264 10.3402/polar.v25i2.6240 10.1046/j.1469-8137.2002.00526.x 10.1139/m83-150 10.1073/pnas.1913314116 10.5962/p.358269 10.1139/b91-345 10.1657/1523-0430(2003)035[0074:FSOTAA]2.0.CO;2 10.1007/s10533-020-00666-7 10.1016/B0-12-348530-4/00457-4 10.1139/as-2020-0057 10.2307/2388844 10.1111/j.1365-2486.2010.02234.x 10.1007/s11104-014-2031-y 10.1179/1743282012Y.0000000038 10.1890/04-0461 10.1007/s11104-020-04492-6 10.1111/1365-2745.14236 10.1657/1938-4246-43.2.267 10.1080/15230430.2002.12003497 10.1139/X09-160 10.1093/jxb/49.328.1845 10.1128/aem.48.3.594-600.1984 10.1007/s10533-014-0019-6 10.1007/978-3-642-75168-4_3 10.1088/1748-9326/7/3/034027 10.1007/BF00239692 10.3389/fpls.2020.01178 10.1038/nature07028 10.1016/S0929-1393(98)00145-0 10.1371/journal.pone.0146655 10.1098/rsbl.2012.0429 10.1111/j.1365-2745.2011.01859.x 10.2307/1937432 10.1007/s10021-020-00534-3 10.1111/nph.13993 10.1016/j.soilbio.2013.12.005 10.1111/gcb.17401 10.1139/as-2021-0053 10.1038/nature01051 10.1104/pp.43.8.1185 10.1111/nph.16611 10.1042/bj2560429 10.1016/j.soilbio.2019.05.009 10.1111/1365-2435.14088 10.1007/s10533-021-00761-3 10.1186/s40168-021-01001-4 10.1639/05 10.1007/s11104-013-1984-6 10.1111/j.1654-1103.2010.01237.x 10.1139/b79-034 |
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| Snippet | In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N
2
-fixing microorganisms (diazotrophs) that play... In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N 2 -fixing microorganisms (diazotrophs) that play... In northern biomes, growth is nitrogen (N) limited, but bryophytes are abundant. These bryophytes often host N2-fixing microorganisms (diazotrophs) that play a... |
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| SubjectTerms | Acetylene reduction assay Activity patterns Arctic zone Autumn Biodiversity Biomedical and Life Sciences Bryophytes Climate change Climatic conditions Cold Cyanobacteria Ecology Ecosystems Environmental Management Flowers & plants Geoecology/Natural Processes Habitats Hydrology/Water Resources Life Sciences Liverwort Microorganisms Mosses Multispecies N2-fixation Nitrogen Nitrogen fixation Nitrogenation Original Article Plant Sciences Seasonal variations Seasonality Spring Spring (season) Summer Taiga & tundra Temperature Tundra Wetlands Winter Zoology |
| Subtitle | Year-Round Variation in Bryophyte-Associated Nitrogen Fixation in the Arctic |
| Title | Year-Round Variation in Bryophyte-Associated Nitrogen Fixation in the Arctic |
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