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Changes in the distributions of epiphytic lichens in southern Sweden using a new statistical method
Södertörn University, School of Life Sciences, Biology. Södertörn University, School of Life Sciences, Environmental science.
Södertörn University, School of Life Sciences, Biology. Södertörn University, School of Life Sciences, Environmental science.
2009 (English)In: Nordic Journal of Botany, ISSN 0107-055X, E-ISSN 1756-1051, Vol. 27, no 5, 413-418 p.Article in journal (Refereed) Published
Abstract [en]

Past studies on changes in species distribution have mainly been based on analysis of range boundaries. In contrast, the method used here evaluates shifts in species' geographic centroids within a predefined area. We used presence/absence data on epiphytic lichens collected 1986 and 2003 from 64 sites in southern Sweden. A centroid was calculated each year, for each lichen species and substrate. The distance of centroid movement was evaluated in a permutation procedure. In total, 56 lichen species on 22 tree species were involved in the analyses, yielding 30 cases that had sufficient sample sizes both years to be evaluated. Out of these, three exhibited a significant movement of their centroid. The shift of lichen centroids of Hypogymnia physodes (L.) Nyl. and Vulpicida pinastri (Scop.) J.-E. Mattsson & M. J. Lai on the tree species Juniperus communis L. was 50 and 151 km with the direction 27 degrees and 48 degrees, respectively. For Hypogymnia physodes on Pinus sylvestris L., corresponding values were 41 km and 30 degrees. The northnortheast shifts of these species in Sweden could be a response to a warming climate.

Place, publisher, year, edition, pages
2009. Vol. 27, no 5, 413-418 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:sh:diva-5905DOI: 10.1111/j.1756-1051.2009.00425.xISI: 000270434900013ScopusID: 2-s2.0-73449141476OAI: oai:DiVA.org:sh-5905DiVA: diva2:394040
Available from: 2011-02-01 Created: 2011-02-01 Last updated: 2016-10-10Bibliographically approved
In thesis
1. Studies on spatial and temporal distributions of epiphytic lichens
Open this publication in new window or tab >>Studies on spatial and temporal distributions of epiphytic lichens
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lichens are an important group of organisms in terms of environmental issues, conservation biology and biodiversity, principally due to their sensitivity to changes in their environment. Therefore it is important that we develop our understanding of the factors that affect lichen distribution. In this thesis, both spatial and temporal distributions of epiphytic lichens at different scales have been studied in southern Sweden.

Generation time of the red-listed lichen Cliostomum corrugatum was examined using Bjärka-Säby as the study site. The results showed that the average age of an individual of C. corrugatum is 25–30 years at the onset of spore production.

The rarity of C. corrugatum was also examined. DNA analysis of an intron from 85 samples, collected at five sites in Östergötland, yielded 11 haplotypes. Results from coalescent analysis, mantel test and AMOVA indicated that C. corrugatum have a high ability to disperse. The study concluded that its rarity is most likely connected with the low amount of available habitat, old Quercus robur.

The changes in the distribution of epiphytic lichens in southern Sweden, between 1986 and 2003, were also compared. For each year a centroid was calculated on all combinations of tree and lichen species. The three significant cases showed that the centroid movement pointed toward a north-east or north-north-east direction.

Finally differences in species richness and cover of lichens on large Q. robur were examined between urban and rural environment. The results demonstrated that species number and percent cover was significantly higher on oaks standing rural compared to oaks standing urban. Effects of urban sprawl showed a decline in species richness and cover with increasing age of the surrounding buildings.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 42 p.
Series
Södertörn Doctoral Dissertations, ISSN 1652-7399 ; 72
Series
, Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1471
National Category
Environmental Sciences
Identifiers
urn:nbn:se:sh:diva-17075 (URN)978–91–7519–810–1 (ISBN)
Public defence
2012-10-22, Plank, Fysikhuset, Campus Valla, 10:00 (Swedish)
Opponent
Supervisors
Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2014-12-22Bibliographically approved

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