Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature
Bryophytes are abundant in tundra ecosystems, where they affect carbon and nitrogen cycling through primary production and associations with N-2-fixing bacteria. Bryophyte responses to climate warming are inconclusive, likely because species-specific responses are poorly understood. Here we investig...
Published in: | Arctic Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/bryophyte-species-differ-widely-in-their-growth-and-n2fixation-responses-to-temperature(d75361f0-3272-40b3-99a0-a71976bfa7ed).html https://doi.org/10.1139/AS-2021-0053 https://curis.ku.dk/ws/files/332115929/as_2021_0053.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/d75361f0-3272-40b3-99a0-a71976bfa7ed 2024-06-09T07:42:22+00:00 Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature Rzepczynska, Agnieszka Marta Michelsen, Anders Olsen, Maya Anne Nissen Lett, Signe 2022 application/pdf https://curis.ku.dk/portal/da/publications/bryophyte-species-differ-widely-in-their-growth-and-n2fixation-responses-to-temperature(d75361f0-3272-40b3-99a0-a71976bfa7ed).html https://doi.org/10.1139/AS-2021-0053 https://curis.ku.dk/ws/files/332115929/as_2021_0053.pdf eng eng info:eu-repo/semantics/openAccess Rzepczynska , A M , Michelsen , A , Olsen , M A N & Lett , S 2022 , ' Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature ' , Arctic Science , vol. 8 , no. 4 . https://doi.org/10.1139/AS-2021-0053 acetylene reduction assay delta C-13 delta N-15 mosses nitrogen cycling subarctic tundra ecosystems CARBON-ISOTOPE DISCRIMINATION BIOLOGICAL NITROGEN-FIXATION EXPERIMENTAL WARMING ALTERS N-15 NATURAL-ABUNDANCE SUB-ARCTIC BRYOPHYTE ATMOSPHERIC NITROGEN COMMUNITY COMPOSITION LITTER DECOMPOSITION DINITROGEN FIXATION SEASONAL-VARIATION article 2022 ftcopenhagenunip https://doi.org/10.1139/AS-2021-0053 2024-05-16T11:29:26Z Bryophytes are abundant in tundra ecosystems, where they affect carbon and nitrogen cycling through primary production and associations with N-2-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 degrees C. We measured growth, N concentration, delta N-15, and delta C-13 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 delta N-15 indicated that, for some species, increased N-2-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 University of Copenhagen: Research Arctic Arctic Science |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
acetylene reduction assay delta C-13 delta N-15 mosses nitrogen cycling subarctic tundra ecosystems CARBON-ISOTOPE DISCRIMINATION BIOLOGICAL NITROGEN-FIXATION EXPERIMENTAL WARMING ALTERS N-15 NATURAL-ABUNDANCE SUB-ARCTIC BRYOPHYTE ATMOSPHERIC NITROGEN COMMUNITY COMPOSITION LITTER DECOMPOSITION DINITROGEN FIXATION SEASONAL-VARIATION |
spellingShingle |
acetylene reduction assay delta C-13 delta N-15 mosses nitrogen cycling subarctic tundra ecosystems CARBON-ISOTOPE DISCRIMINATION BIOLOGICAL NITROGEN-FIXATION EXPERIMENTAL WARMING ALTERS N-15 NATURAL-ABUNDANCE SUB-ARCTIC BRYOPHYTE ATMOSPHERIC NITROGEN COMMUNITY COMPOSITION LITTER DECOMPOSITION DINITROGEN FIXATION SEASONAL-VARIATION Rzepczynska, Agnieszka Marta Michelsen, Anders Olsen, Maya Anne Nissen Lett, Signe Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature |
topic_facet |
acetylene reduction assay delta C-13 delta N-15 mosses nitrogen cycling subarctic tundra ecosystems CARBON-ISOTOPE DISCRIMINATION BIOLOGICAL NITROGEN-FIXATION EXPERIMENTAL WARMING ALTERS N-15 NATURAL-ABUNDANCE SUB-ARCTIC BRYOPHYTE ATMOSPHERIC NITROGEN COMMUNITY COMPOSITION LITTER DECOMPOSITION DINITROGEN FIXATION SEASONAL-VARIATION |
description |
Bryophytes are abundant in tundra ecosystems, where they affect carbon and nitrogen cycling through primary production and associations with N-2-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 degrees C. We measured growth, N concentration, delta N-15, and delta C-13 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 delta N-15 indicated that, for some species, increased N-2-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 |
Rzepczynska, Agnieszka Marta Michelsen, Anders Olsen, Maya Anne Nissen Lett, Signe |
author_facet |
Rzepczynska, Agnieszka Marta Michelsen, Anders Olsen, Maya Anne Nissen Lett, Signe |
author_sort |
Rzepczynska, Agnieszka Marta |
title |
Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature |
title_short |
Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature |
title_full |
Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature |
title_fullStr |
Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature |
title_full_unstemmed |
Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature |
title_sort |
bryophyte species differ widely in their growth and n 2 -fixation responses to temperature |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/bryophyte-species-differ-widely-in-their-growth-and-n2fixation-responses-to-temperature(d75361f0-3272-40b3-99a0-a71976bfa7ed).html https://doi.org/10.1139/AS-2021-0053 https://curis.ku.dk/ws/files/332115929/as_2021_0053.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change Subarctic Tundra |
genre_facet |
Arctic Arctic Climate change Subarctic Tundra |
op_source |
Rzepczynska , A M , Michelsen , A , Olsen , M A N & Lett , S 2022 , ' Bryophyte species differ widely in their growth and N 2 -fixation responses to temperature ' , Arctic Science , vol. 8 , no. 4 . https://doi.org/10.1139/AS-2021-0053 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1139/AS-2021-0053 |
container_title |
Arctic Science |
_version_ |
1801371267102670848 |