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dc.contributor.authorBjerke, Jarle Werner
dc.contributor.authorBokhorst, Stef
dc.contributor.authorCallaghan, Terry V.
dc.contributor.authorZielke, Matthias
dc.contributor.authorPhoenix, Gareth K.
dc.date.accessioned2017-12-19T11:03:43Z
dc.date.available2017-12-19T11:03:43Z
dc.date.created2013-02-06T10:07:14Z
dc.date.issued2013-03-06
dc.identifier.citationPlant Ecology & Diversity. 2013, 6 (3-4), 383-392.nb_NO
dc.identifier.issn1755-0874
dc.identifier.urihttp://hdl.handle.net/11250/2472810
dc.description.abstractBackground: 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 warmingnb_NO
dc.language.isoengnb_NO
dc.publisherTaylor & Francisnb_NO
dc.titleRapid photosynthetic recovery of a snow-covered feather moss and Peltigera lichen during sub-Arctic midwinter warmingnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.rights.holder© 2013 Botanical Society of Scotland and Taylor & Francisnb_NO
dc.source.pagenumber383-392nb_NO
dc.source.volume6nb_NO
dc.source.journalPlant Ecology & Diversitynb_NO
dc.source.issue3-4nb_NO
dc.identifier.doi10.1080/17550874.2013.771712
dc.identifier.cristin1006936
dc.relation.projectNorges forskningsråd: 216434nb_NO
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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