Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming
Background: Arctic lichens and mosses are covered by snow for more than half the year and are generally considered as being dormant for most of this period. However, enhanced frequency of winter warming events due to climate change can cause increased disturbance of their protective subnivean enviro...
Published in: | Plant Ecology & Diversity |
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Online Access: | http://hdl.handle.net/11250/2472810 https://doi.org/10.1080/17550874.2013.771712 |
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ftnibiocom:oai:brage.bibsys.no:11250/2472810 2023-05-15T14:59:16+02:00 Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming Bjerke, Jarle Werner Bokhorst, Stef Callaghan, Terry V. Zielke, Matthias Phoenix, Gareth K. 2017-12-19T11:03:43Z http://hdl.handle.net/11250/2472810 https://doi.org/10.1080/17550874.2013.771712 eng eng Taylor & Francis Norges forskningsråd: 216434 © 2013 Botanical Society of Scotland and Taylor & Francis 383-392 6 Plant Ecology & Diversity 3-4 Journal article Peer reviewed 2017 ftnibiocom https://doi.org/10.1080/17550874.2013.771712 2018-08-13T13:09:34Z Background: Arctic lichens and mosses are covered by snow for more than half the year and are generally considered as being dormant for most of this period. However, enhanced frequency of winter warming events due to climate change can cause increased disturbance of their protective subnivean environment. Aim: To further understand cryptogamic responses to mid-winter warming we compared the ecophysiological performance of one lichen and one moss species during a simulated warming event. Methods: We measured photosynthesis and dark respiration in samples of the moss Hylocomium splendens and the lichen Peltigera aphthosa removed from under snow, and on natural refreezing after the warming event, which was simulated by using infrared heaters suspended above the ground. Results: The moss exposed to light at +5 °C immediately after removal from their subnivean environment and from warmed plots showed positive net gas exchange within 332 s; the lichen required 1238 s. Photosynthesis and nitrogen fixation rates were equal to that, or higher than, during the preceding growing season. Upon refreezing after the event, moss photosynthesis declined considerably. Conclusions: The moss, and to a lesser extent the lichen, may contribute to subnivean midwinter ecosystem respiration, and both are opportunistic, and can take advantage of warmer winter phases for photosynthesis and growth. This ought to be taken into account in vegetation change projections of cryptogam-rich ecosystems. carbon flux; climate change; cryptogams; dormancy; gas exchange; nitrogen fixation; reactivation; snow melt; subnivean environment; winter warming acceptedVersion Article in Journal/Newspaper Arctic Climate change Norwegian Institute of Bioeconomy Research: NIBIO Brage Arctic Midwinter ENVELOPE(139.931,139.931,-66.690,-66.690) Plant Ecology & Diversity 6 3-4 383 392 |
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Open Polar |
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Norwegian Institute of Bioeconomy Research: NIBIO Brage |
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ftnibiocom |
language |
English |
description |
Background: Arctic lichens and mosses are covered by snow for more than half the year and are generally considered as being dormant for most of this period. However, enhanced frequency of winter warming events due to climate change can cause increased disturbance of their protective subnivean environment. Aim: To further understand cryptogamic responses to mid-winter warming we compared the ecophysiological performance of one lichen and one moss species during a simulated warming event. Methods: We measured photosynthesis and dark respiration in samples of the moss Hylocomium splendens and the lichen Peltigera aphthosa removed from under snow, and on natural refreezing after the warming event, which was simulated by using infrared heaters suspended above the ground. Results: The moss exposed to light at +5 °C immediately after removal from their subnivean environment and from warmed plots showed positive net gas exchange within 332 s; the lichen required 1238 s. Photosynthesis and nitrogen fixation rates were equal to that, or higher than, during the preceding growing season. Upon refreezing after the event, moss photosynthesis declined considerably. Conclusions: The moss, and to a lesser extent the lichen, may contribute to subnivean midwinter ecosystem respiration, and both are opportunistic, and can take advantage of warmer winter phases for photosynthesis and growth. This ought to be taken into account in vegetation change projections of cryptogam-rich ecosystems. carbon flux; climate change; cryptogams; dormancy; gas exchange; nitrogen fixation; reactivation; snow melt; subnivean environment; winter warming acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Bjerke, Jarle Werner Bokhorst, Stef Callaghan, Terry V. Zielke, Matthias Phoenix, Gareth K. |
spellingShingle |
Bjerke, Jarle Werner Bokhorst, Stef Callaghan, Terry V. Zielke, Matthias Phoenix, Gareth K. Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming |
author_facet |
Bjerke, Jarle Werner Bokhorst, Stef Callaghan, Terry V. Zielke, Matthias Phoenix, Gareth K. |
author_sort |
Bjerke, Jarle Werner |
title |
Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming |
title_short |
Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming |
title_full |
Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming |
title_fullStr |
Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming |
title_full_unstemmed |
Rapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warming |
title_sort |
rapid photosynthetic recovery of a snow-covered feather moss and peltigera lichen during sub-arctic midwinter warming |
publisher |
Taylor & Francis |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2472810 https://doi.org/10.1080/17550874.2013.771712 |
long_lat |
ENVELOPE(139.931,139.931,-66.690,-66.690) |
geographic |
Arctic Midwinter |
geographic_facet |
Arctic Midwinter |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
383-392 6 Plant Ecology & Diversity 3-4 |
op_relation |
Norges forskningsråd: 216434 |
op_rights |
© 2013 Botanical Society of Scotland and Taylor & Francis |
op_doi |
https://doi.org/10.1080/17550874.2013.771712 |
container_title |
Plant Ecology & Diversity |
container_volume |
6 |
container_issue |
3-4 |
container_start_page |
383 |
op_container_end_page |
392 |
_version_ |
1766331380235501568 |