Håkan Lättman
Södertörn University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Håkan Lättman.
Annales Botanici Fennici | 2009
Victor Johansson; Karl-Olof Bergman; Håkan Lättman; Per Milberg
Oaks (Quercus robur) can reach a considerable age, which makes them an important substrate for many epiphytic lichens, including several red-listed species. We studied the importance of tree size and other environmental factors for the occurrence of six epiphytic lichens at two sites, in southeastern Sweden, differing in quality as judged by tree size distribution and number of old trees. The effects of tree circumference, light availability, trunk inclination and site were analysed. Results showed that different lichen species responded differently to these factors, but, overall, tree size was most important for lichen occurrence. Five species showed a positive relation to tree size, but the 50% probability of occurrence was reached at different tree sizes among these species and there were also site differences. This study shows that the maintenance of old trees is crucial for several lichen species, which highlights the importance of long-term management plans.
Lichenologist | 2006
Jan-Eric Mattsson; Håkan Lättman; Per Milberg
A relatively quick and simple method is presented for monitoring changes in distribution and in site and substratum preferences of epiphytic macrolichens; the method also records the natural turnov ...
Lichenologist | 2009
Håkan Lättman; Annelie Brand; Johanna Hedlund; Mikael Krikorev; Niklas Olsson; Alexandra Robeck; Fredrik Rönnmark; Jan-Eric Mattsson
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 Bjarka-Saby 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 Ostergotland, 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.
Lichenologist | 2009
Ulf Arup; Stefan Ekman; Lars Fröberg; Patrik Frödén; Tommy Knutsson; Håkan Lättman; Louise Lindblom; Jan-Eric Mattsson; Arne Thell; Martin Westberg
On 19 July 2009 Ingvar Karnefelt celebrated his 65th birthday. This could have meant that we, his former students, would be celebrating him in his retirement from his position as head of the Biolog ...
Biological Conservation | 2009
Håkan Lättman; Louise Lindblom; Jan-Eric Mattsson; Per Milberg; Morten Skage; Stefan Ekman
Nordic Journal of Botany | 2014
Håkan Lättman; Karl-Olof Bergman; Malin Rapp; Malin Tälle; Lars Westerberg; Per Milberg
Nordic Journal of Botany | 2009
Håkan Lättman; Per Milberg; Michael W. Palmer; Jan-Eric Mattsson
Archive | 2012
Håkan Lättman
Archive | 2004
Jan-Eric Mattsson; Håkan Lättman
8th International Mycological Congress, Cairns, Australia. | 2006
Håkan Lättman; Johanna Hedlund; Mikael Krikorev; Niklas Olsson; Fredrik Rönnmark; Jan-Eric Mattsson