Change search
ReferencesLink to record
Permanent link

Direct link
Växtsamhällen på osorterade cirklar i Abisko: Hur förändrad kryogen aktivitet kan påverka sammansättning och artrikedom av kärlväxter
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Vascular plant communities on non-sorted circles in Abisko : How changes in cryogenic activity can affect species composition and richness (English)
Abstract [en]

Non-sorted circles are patterned ground features created by cryogenic activity in alpine and arctic areas. In these features, cryogenic activity controls vegetation communities by causing repeated disturbance and therefore provides habitat for species that are poor competitors but can tolerate disturbance. A recent study has shown that there is a trend where shrub vegetation overgrows the bare soil found within non-sorted circles. The aim of this study was to assess how the vascular plant communities on non-sorted circles have changed since 1985 and determine to what extent cryogenic activity affect vegetation communities. The study was conducted in Abisko and the point frame method was used to re-investigate how the plant species composition and richness have changed between 1985 and 2012, while a visual frame method was used to investigate how the plant communities change along a gradient of cryogenic activity. The results showed that the vascular plant communities on non-sorted circles in Abisko have changed since 1985 with a decrease in poorly competitive species, and an increase in competitive species. My results suggest that species richness is favoured by cryogenic activity, as the highest species richness was found on intermediately disturbed sites and on the transition zone between bare soil and fully developed vegetation cover. My findings indicate that poorly competitive species will lose habitat and become outcompeted by other species when cryogenic activity decreases, and therefore I conclude that there is a risk of local loss in vascular plant species richness in alpine areas.

Place, publisher, year, edition, pages
2013. , 34 p.
Keyword [en]
non-sorted circles, vascular plant communities, alpine areas, cryoturbation, climate change
National Category
Natural Sciences
URN: urn:nbn:se:umu:diva-74588OAI: diva2:634603
Educational program
Bachelor of Science in Biology and Earthscience
2013-06-07, 11:30 (Swedish)
Available from: 2013-07-01 Created: 2013-07-01 Last updated: 2013-07-01Bibliographically approved

Open Access in DiVA

Berglund_2013(1085 kB)192 downloads
File information
File name FULLTEXT01.pdfFile size 1085 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Ecology and Environmental Sciences
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 192 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 87 hits
ReferencesLink to record
Permanent link

Direct link