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- Tyler, Torbjörn, et al.
(författare)
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Sentida förändringar i Skånes flora
- 2007
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Ingår i: Floran i Skåne. Arterna och deras utbredning.. - 9197102156 ; , s. 57-61
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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- Tyler, Torbjörn, et al.
(författare)
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Skånes klimat i korthet.
- 2007
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Ingår i: Floran i Skåne. Arterna och deras utbredning.. - 9197102156 ; , s. 5-6
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Tyler, Torbjörn, et al.
(författare)
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Skånes mossor.
- 2003
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Ingår i: Floran i Skåne. Vegetation och utflyktsmål.. - 9197102148 ; , s. 117-124
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Bokkapitel (populärvet., debatt m.m.)
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| 7. |
- Tyler, Torbjörn, et al.
(författare)
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Statistiska uppgifter kring Skånes flora.
- 2007
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Ingår i: Floran i Skåne. Arterna och deras utbredning.. - 9197102156 ; , s. 119-123
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Tyler, Torbjörn, et al.
(författare)
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Determinants of bryophyte species composition and diversity on the Great Alvar of oland, Sweden
- 2018
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Ingår i: Journal of Bryology. - : TAYLOR & FRANCIS LTD. - 0373-6687 .- 1743-2820. ; 40:1, s. 12-30
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Tidskriftsartikel (refereegranskat)abstract
- Factors driving the species richness and distribution of bryophytes are poorly studied and not well understood, particularly in grasslands. We analysed the occurrence of bryophyte species and variation in species richness across 674 plots (0.5 m x 0.5 m) in alvar vegetation (grassland on limestone pavement with thin or no soil) on oland (Sweden) in relation to substrate characteristics and chemistry, inundation frequency, grazing pressure and geographical variables. We found 148 taxa, including 11 nationally red-listed ones. Species richness per plot was significantly associated with substrate type, positively associated with pH and grazing intensity, but negatively associated with soil depth. However, richness of species typical of, or restricted to, alvar habitats responded differently to richness of species more common in other habitats. Typical alvar species were favoured by high pH, shallow soil and low phosphate availability, while generalists preferred relatively low pH, higher phosphate availability and organic or mull soil types. Distance from the alvar margin had only weak effects. Concerning the effects on individual species and community composition, inundation frequency and pH were found to have the largest effects, although other factors (substrate type, soil depth, bare soil, bare stone, phosphate availability and grazing pressure) were more important for some individual species, stressing the importance of microsite variability and variability in management for regional species richness. From a conservation perspective, it is concluded that grazing is generally positive whilst factors increasing phosphate availability may disadvantage the typical alvar species, and proximity to the alvar margin is not a major problem.
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- Jönsson, Jane, et al.
(författare)
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Ten polymorphic microsatellite markers for Hieracium s.s. (Asteraceae)
- 2010
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Ingår i: Conservation Genetics Resources. - : Springer Science and Business Media LLC. - 1877-7260 .- 1877-7252. ; 2:1, s. 295-300
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Tidskriftsartikel (refereegranskat)abstract
- Eight novel microsatellite markers were developed for Hieracium s.s. (excluding Pilosella) using a modified FIASCO protocol, and two out of nine microsatellites that were originally developed for Pilosella officinarum were optimised for Hieracium s.s.. All ten microsatellites consistently amplified loci from a wide range of representatives from north and central European species of various sections of the genus. When tested on 19 individuals, nine microsatellites were found to be highly polymorphic with 6–29 alleles, while one microsatellite marker was monomorphic. Cross-amplification showed that six of the ten microsatellites also amplified products in one taxon of Pilosella, P. floribunda × officinarum.
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- Tyler, Torbjörn, et al.
(författare)
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Patterns of plastid and nuclear variation among apomictic polyploids of Hieracium: evolutionary processes and taxonomic implications.
- 2013
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Ingår i: Annals of Botany. - : Oxford University Press (OUP). - 0305-7364 .- 1095-8290. ; 111:4, s. 591-609
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Tidskriftsartikel (refereegranskat)abstract
- Background and AimsApomictic species (with asexual seed production) make up for 20-50 % of all taxonomically recognized species in northern Europe, but the phylogenetic relationships of apomictic species and the mode of evolution and speciation remain largely unknown and their taxonomy is consequently disputed.MethodsIn the present study, plastid psbD-trnT sequences (349 accessions) and 12 nuclear microsatellite loci (478 accessions) were used to create an overview of the molecular variation in (mainly) northern European members of the most species-rich of all plant genera, Hieracium s.s. The results are discussed and interpreted in the context of morphological and cytological data on the same species.Key Results and ConclusionsThe complete psbD-trnT alignment was 1243 bp and 50 polymorphisms defined 40 haplotypes. All haplotypes found in the sections of the genus distributed in the northern European lowlands fell into one of two main groups, group H and group V, mutually separated by seven or eight polymorphisms. All accessions belonging to H. sects. Foliosa, Hieracioides (viz. H. umbellatum) and Tridentata and all but one accession of triploid species of H. sects. Oradea and Vulgata showed haplotypes of group V. Haplotypes of group H were found in all accessions of H. sects. Bifida and Hieracium and in all tetraploid representatives of H. sects. Oreadea and Vulgata. Additional haplotypes were found in accessions of the genus Pilosella and in southern European and Alpine sections of Hieracium. In contrast, the distribution of individual haplotypes in the two major groups appeared uncorrelated with morphology and current taxonomy, but polymorphisms within species were only rarely encountered. In total, 160 microsatellite alleles were identified. Levels of variation were generally high with only nine pairs of accessions being identical at all loci (in all cases representing accessions of the same species). In the neighbor-joining analysis based on the microsatellite data, accessions of the same species generally clustered together and some smaller groups of species congruent with morphology and/or current taxonomy were recovered but, except for H. sect. Oreadea, most larger groups were not correlated with morphology. Although the plastid DNA sequences show too little variation and the nuclear microsatellites are too variable to resolve relationships successfully among species or to fully understand processes of evolution, it is concluded that both species and sections as defined by morphology are largely congruent with the molecular data, that gene flow between the sections is rare or non-existent and that the tetraploid species may constitute the key to understanding evolution and speciation in this genus.
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