Bryophyte species differ widely in their growth and N2-fixation responses to temperature
Bryophytes are abundant in tundra ecosystems, where they affect carbon and nitrogen cycling through primary production and associations with N2-fixing bacteria. Bryophyte responses to climate warming are inconclusive, likely because species-specific responses are poorly understood. Here we investiga...
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Canadian Science Publishing
2022
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Online Access: | https://doi.org/10.1139/as-2021-0053 https://doaj.org/article/ae2247d88ed34089be9ed0d07c982551 |
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ftdoajarticles:oai:doaj.org/article:ae2247d88ed34089be9ed0d07c982551 2023-05-15T14:23:51+02:00 Bryophyte species differ widely in their growth and N2-fixation responses to temperature Agnieszka Marta Rzepczynska Anders Michelsen Maya Anne Nissen Olsen Signe Lett 2022-12-01T00:00:00Z https://doi.org/10.1139/as-2021-0053 https://doaj.org/article/ae2247d88ed34089be9ed0d07c982551 EN FR eng fre Canadian Science Publishing https://cdnsciencepub.com/doi/10.1139/as-2021-0053 https://doaj.org/toc/2368-7460 doi:10.1139/as-2021-0053 2368-7460 https://doaj.org/article/ae2247d88ed34089be9ed0d07c982551 Arctic Science, Vol 8, Iss 4, Pp 1236-1251 (2022) acetylene reduction assay δ13C δ15N mosses nitrogen cycling subarctic tundra ecosystems Environmental sciences GE1-350 Environmental engineering TA170-171 article 2022 ftdoajarticles https://doi.org/10.1139/as-2021-0053 2022-12-30T19:37:42Z Bryophytes are abundant in tundra ecosystems, where they affect carbon and nitrogen cycling through primary production and associations with N2-fixing bacteria. Bryophyte responses to climate warming are inconclusive, likely because species-specific responses are poorly understood. Here we investigated how warming affects the growth and nitrogenase activity of 10 tundra bryophyte species in two tundra landscapes. Collected bryophyte samples were grown in temperature-controlled growth chambers for 12 weeks at five temperatures from 3 to 18 °C. We measured growth, N concentration, δ15N, and δ13C after 3 months and nitrogenase activity after 5 and 12 weeks. Bryophyte growth and associated nitrogenase activity generally increased with temperature, but species differed in their optima. Bryophyte N concentration and δ15N indicated that, for some species, increased N2-fixation could not compensate for growth-induced N limitation. High landscape coverage and large positive warming effects on feather mosses and Sphagnum species highlight their competitive advantages, confirm earlier field observations, and contribute to the mechanistic understanding of differential bryophyte growth in response to warming. We suggest that indirect effects of climate change, such as surface drying and shrub expansion, are likely main threats to slow-growing bryophytes across the Arctic, with consequences for biodiversity and C balance. Article in Journal/Newspaper Arctic Arctic Climate change Subarctic Tundra Directory of Open Access Journals: DOAJ Articles Arctic Arctic Science |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English French |
topic |
acetylene reduction assay δ13C δ15N mosses nitrogen cycling subarctic tundra ecosystems Environmental sciences GE1-350 Environmental engineering TA170-171 |
spellingShingle |
acetylene reduction assay δ13C δ15N mosses nitrogen cycling subarctic tundra ecosystems Environmental sciences GE1-350 Environmental engineering TA170-171 Agnieszka Marta Rzepczynska Anders Michelsen Maya Anne Nissen Olsen Signe Lett Bryophyte species differ widely in their growth and N2-fixation responses to temperature |
topic_facet |
acetylene reduction assay δ13C δ15N mosses nitrogen cycling subarctic tundra ecosystems Environmental sciences GE1-350 Environmental engineering TA170-171 |
description |
Bryophytes are abundant in tundra ecosystems, where they affect carbon and nitrogen cycling through primary production and associations with N2-fixing bacteria. Bryophyte responses to climate warming are inconclusive, likely because species-specific responses are poorly understood. Here we investigated how warming affects the growth and nitrogenase activity of 10 tundra bryophyte species in two tundra landscapes. Collected bryophyte samples were grown in temperature-controlled growth chambers for 12 weeks at five temperatures from 3 to 18 °C. We measured growth, N concentration, δ15N, and δ13C after 3 months and nitrogenase activity after 5 and 12 weeks. Bryophyte growth and associated nitrogenase activity generally increased with temperature, but species differed in their optima. Bryophyte N concentration and δ15N indicated that, for some species, increased N2-fixation could not compensate for growth-induced N limitation. High landscape coverage and large positive warming effects on feather mosses and Sphagnum species highlight their competitive advantages, confirm earlier field observations, and contribute to the mechanistic understanding of differential bryophyte growth in response to warming. We suggest that indirect effects of climate change, such as surface drying and shrub expansion, are likely main threats to slow-growing bryophytes across the Arctic, with consequences for biodiversity and C balance. |
format |
Article in Journal/Newspaper |
author |
Agnieszka Marta Rzepczynska Anders Michelsen Maya Anne Nissen Olsen Signe Lett |
author_facet |
Agnieszka Marta Rzepczynska Anders Michelsen Maya Anne Nissen Olsen Signe Lett |
author_sort |
Agnieszka Marta Rzepczynska |
title |
Bryophyte species differ widely in their growth and N2-fixation responses to temperature |
title_short |
Bryophyte species differ widely in their growth and N2-fixation responses to temperature |
title_full |
Bryophyte species differ widely in their growth and N2-fixation responses to temperature |
title_fullStr |
Bryophyte species differ widely in their growth and N2-fixation responses to temperature |
title_full_unstemmed |
Bryophyte species differ widely in their growth and N2-fixation responses to temperature |
title_sort |
bryophyte species differ widely in their growth and n2-fixation responses to temperature |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
https://doi.org/10.1139/as-2021-0053 https://doaj.org/article/ae2247d88ed34089be9ed0d07c982551 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change Subarctic Tundra |
genre_facet |
Arctic Arctic Climate change Subarctic Tundra |
op_source |
Arctic Science, Vol 8, Iss 4, Pp 1236-1251 (2022) |
op_relation |
https://cdnsciencepub.com/doi/10.1139/as-2021-0053 https://doaj.org/toc/2368-7460 doi:10.1139/as-2021-0053 2368-7460 https://doaj.org/article/ae2247d88ed34089be9ed0d07c982551 |
op_doi |
https://doi.org/10.1139/as-2021-0053 |
container_title |
Arctic Science |
_version_ |
1766296321016201216 |