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Generation time estimated to be 25-30 years in Cliostomum cossugatum (Ach.) Fr.
Linköping University, Department of Physics, Chemistry and Biology, Ecology . Linköping University, The Institute of Technology.
School of Life Sciences, Södertörn University, SE-141 89 Huddinge, Sweden.
School of Life Sciences, Södertörn University, SE-141 89 Huddinge, Sweden.
School of Life Sciences, Södertörn University, SE-141 89 Huddinge, Sweden.
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2009 (English)In: The Lichenologist, ISSN 0024-2829, E-ISSN 1096-1135, Vol. 41, no 5, 557-559 p.Article in journal (Other academic) Published
Abstract [en]

Knowledge of spore to spore generation time is extremely important for several reasons. As it is the shortest generation time, it indicates the maximum nucleotide substitution rate over time and provides a rate limit for the evolution of a species. In population genetics most calculations involving time use ‘generations’ as the unit of measurement and in order to convert these ‘generations’ into ‘years’, knowledge of generation time is needed but rarely available. Knowledge of generation time may also be essential for conservation purposes and assessments of migration history. This knowledge also makes it possible to estimate both the age of a population and also to determine to what extent a population represents the genetic diversity of a species (Rosenberg & Nordborg 2002). In this paper we present a method for assessing generation length for lichens using Cliostomum corrugatum (Ach.) Fr. as an example. This lichen was selected for investigation because it is restricted to forests with long temporal continuity (Lättman et al. 2009) and information on generation time is essential to estimate the rate of dispersal at the landscape level.

Place, publisher, year, edition, pages
Britich Lichen Society , 2009. Vol. 41, no 5, 557-559 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:liu:diva-19822DOI: 10.1017/S0024282909990259OAI: oai:DiVA.org:liu-19822DiVA: diva2:229048
Available from: 2009-08-11 Created: 2009-08-11 Last updated: 2017-12-13
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
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1471
Series
Södertörn Doctoral Dissertation, ISSN 1652-7399 ; 72
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-81433 (URN)978-91-7519-810-1 (ISBN)
Public defence
2012-10-22, Plank, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:00 (Swedish)
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Note

In the electronic version of this dissertation the Södertörn series Södertörn Doctoral Dissertation 72, ISSN 1652–7399, has been removed.

Available from: 2012-09-14 Created: 2012-09-14 Last updated: 2016-12-12Bibliographically approved

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Lättman, Håkan

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