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Estimating the dispersal capacity of the rare lichen Cliostomum corrugatum
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.
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2009 (English)In: Biological Conservation, ISSN 0006-3207, E-ISSN 1873-2917, Vol. 142, no 8, 1870-1878 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this study was to estimate the dispersal rate in an organism assumed to be confined to tree stands with unbroken continuity. We used the lichen-forming ascomycete Cliostomum corrugatum, which is largely confined to old oak stands. Five populations, with pairwise distances ranging from 6.5 to 83 km, were sampled in Ostergotland, south-eastern Sweden. DNA sequence data from an intron in the small subunit nuclear ribosomal RNA gene was obtained from 85 samples. Nearly all molecular variance (99.6%) was found within populations and there were no signs of isolation-by-distance. The absolute number of immigrants per population per generation (estimated to 30 years), inferred by Bayesian MCMC, was found to be between 1 and 5. Altogether, evidence suggests abundant gene flow in the history of our sample. A simulation procedure demonstrated that we cannot know whether effective dispersal is ongoing or if it ceased at the time when oaks started to decrease dramatically around 400 years BP. However, a scenario where effective dispersal ceased already at the time when the postglacial reinvasion of oak had reached the region around 6000 years BP is unlikely. Vegetation history suggests that the habitat of C. corrugatum was patchily distributed in the landscape since the early Holocene. Combined with the high dispersal rate estimate, this suggests that the species has been successful at frequently crossing distances of at least several kilometres and possibly that it has primarily been limited by the availability of habitat rather than by dispersal.

Place, publisher, year, edition, pages
2009. Vol. 142, no 8, 1870-1878 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:sh:diva-5908DOI: 10.1016/j.biocon.2009.03.026ISI: 000267409300035ScopusID: 2-s2.0-67349280881OAI: oai:DiVA.org:sh-5908DiVA: diva2:394029
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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