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dc.contributor.authorHeggenes, Jan
dc.contributor.authorFagertun, Christian
dc.contributor.authorOdland, Arvid
dc.contributor.authorBjerketvedt, Dag K.
dc.date.accessioned2021-05-11T12:31:47Z
dc.date.available2021-05-11T12:31:47Z
dc.date.created2020-09-21T10:12:08Z
dc.date.issued2020
dc.identifier.citationHeggenes, J., Fagertun, C., Odland, A., & Bjerketvedt, D. K. (2020). Soft resilience: moisture-dependent lichen elasticity buffer herbivore trampling in cold alpine-tundra ecosystems. Polar Biology, 43(7).en_US
dc.identifier.issn0722-4060
dc.identifier.urihttps://hdl.handle.net/11250/2754940
dc.description.abstractHerbivores may have extensive top-down effects in open grazing ecosystems, generating vegetation changes by grazing and trampling. Trampling effects are understudied, but may be a major ecological factor. In cold alpine-Arctic ecosystems grazing and trampling by wild tundra reindeer (Rangifer tarandus) may be particularly important in lichen-dominated heaths. Dry lichen are crushed by trampling, and it is estimated that volume loss of lichen trampled may be considerably larger than lichen volume eaten by reindeer. Humidity affects lichen pliability and elasticity, and thereby resilience to trampling. Although crucial for estimating lichen vegetation trampling loss, the relationship between humidity and lichen elasticity is not well known. We collected samples of three lichen species in natura and in factorial experiments tested effects of species, levels of humidity (25, 70, 80, 90 and 100% RH) and temperatures (5 and 25 °C), on resilience to trampling (pressure resistance). The humidity:species interaction was the strongest factor increasing pressure resilience with increasing humidity, whereas temperature had small or no effects. Lichen elasticity increased rapidly above 70% RH. Consequently, when estimating lichen resources and potential trampling loss, number of dry days (less than 70% RH) should be estimated. This also has important ramifications for effects of climate change on the sustainability of reindeer populations.en_US
dc.language.isoengen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleSoft resilience: moisture-dependent lichen elasticity buffer herbivore trampling in cold alpine-tundra ecosystemsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© The Author(s) 2020.en_US
dc.source.volume43en_US
dc.source.journalPolar Biologyen_US
dc.source.issue7en_US
dc.identifier.doihttps://doi.org/10.1007/s00300-020-02685-4
dc.identifier.cristin1831529
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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