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Stability of alpine vegetation over 50 years in central Norway

Content Provider	Springer Nature Link
Author	Schei, Fride H. Kapfer, Jutta Birks, H. John B. Grytnes, John Arvid
Copyright Year	2015
Abstract	Alpine vegetation is considered to be particularly sensitive to climate changes. Here we document changes in species richness, distribution and composition over the past 50 years by resurveying vegetation in Rondane, a well-studied alpine area in central Norway. We estimated changes in species occurrences, species richness and species’ realized optima to study relationships between vegetational and environmental change. We used a weighted average approach with elevation and indicator values for light, temperature, pH, moisture, nutrients and tolerance to snow-cover duration. Permutation tests, allowing for unequal sampling in the original survey and the resurvey, indicated whether vegetation changes were statistically significant. We found no significant change in the average number of species per plot since 1950. Of 21 species analysed for changes in frequency and realized optimum, ten showed statistically significant changes in frequency (six decreased, four increased), and six exhibited statistically significant changes in their optimum along the soil-pH gradient. Statistically significant optimum changes were found along the nutrient and light gradients (three species) and the elevation and snow-cover gradients (two species). No statistically significant changes were found along the temperature or moisture gradients. In comparison with other studies, our results suggest that recent climate changes have had a relatively low impact on alpine vegetation in the Rondane mountains. This is indicated by our species optimum analysis, which revealed few changes along gradients that can be directly linked to the climate (temperature and soil moisture) whereas most detected changes appear to be responses to factors related to soil pH. The relative constancy of species’ optima and hence species composition may be explained most parsimoniously by the species pool in the Rondane area, which consists largely of common and widespread species with wide ecological amplitudes and hence broad tolerances to environmental change.
Starting Page	39
Ending Page	48
Page Count	10
File Format	PDF
ISSN	12119520
Journal	Folia Geobotanica
Volume Number	50
Issue Number	1
e-ISSN	18749348
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-06-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	climate change environmental change indicator values Rondane soil pH species optimum vegetation dynamics weighted averaging Plant Systematics/Taxonomy/Biogeography Plant Ecology Plant Sciences Life Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Paleontology

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