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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Veröffentlicht in:	Ecosystems (New York) Jg. 29; H. 1; S. 7
Hauptverfasser:	Andersen, Emil Alexander Sherman, Lett, Signe, Michelsen, Anders, Dorrepaal, Ellen, Olofsson, Johan
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York Springer US 01.02.2026 Springer Nature B.V
Schlagworte:	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 Arctic region Liverwort Multispecies Winter Autumn Mosses Seasonality fixation Spring Acetylene reduction assay Tundra N
ISSN:	1432-9840, 1435-0629, 1435-0629
Online-Zugang:	Volltext
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Zusammenfassung:	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.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14
ISSN:	1432-9840 1435-0629 1435-0629
DOI:	10.1007/s10021-025-01028-w