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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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| 4. |
- 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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| 5. |
- 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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| 6. |
- Tyler, Torbjörn, et al.
(författare)
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Ploidy level analysis of apomictic Hieracium (Asteraceae) reveal unexpected patterns and variation.
- 2009
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 27:6, s. 490-502
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Tidskriftsartikel (refereegranskat)abstract
- The DNA ploidy level of 673 accessions belonging to 238 species of Hieracium have been analyzed by flow cytometry. 222 of the species were of Scandinavian origin as members of the exclusively apomictic H. sectt. Bifida, Hieracium, Oreadea, Tridentata and Vulgata. For the overwhelming majority of the species, the ploidy level (or chromosme number) has never been investigated before. Approximately 50 % of the Scandinavian species, previously believed to be exclusively triploid, were found to be tetraploid. In addition, two pentaploid samples, viz. H. intermarginatum Johanss. & Sam. from Sweden and H. cf. plumbeum Blytt & Fr. from Germany, were found. Although two or more accessions from geographically remote sites were analyzed for approximately 50 % of the Scandinavian species, only 2 (< 2 %) taxonomically undisputed species were found to consist of plants with more than one ploidy level. An intriguing pattern was revealed among Scandinavian members of H. sectt. Bifida and Vulgata when ploidy level and morphometric variation was compared, viz. the most typical or extreme representatives of these sections were found to be exclusively triploid whereas tetraploids dominate among species with intermediate morphology and among species morphologically intermediate between these sections and H. sect. Hieracium. This pattern may indicate that the tetraploids, which tend to have mainly northern distributions, have originated as the result of rare sexual hybridizations between triploid members of different sections, plausibly during or after the northward migration of the parental linages after the last glaciation. The results are believed to be highly relevant for understanding the processes of evolution and speciation within the predominantly apomictic genus Hieracium, but it is emphazised that additional data from e.g. molecular markers and pollen viability analysis are needed before any trustworthy conclusions can be made as far as evolutionary processes are concerned.
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- Tyler, Torbjörn, et al.
(författare)
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Nu startar projekt Skånes Mossor!
- 2007
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Ingår i: Myrinia. - 1102-4194. ; 17:1, s. 52-57
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 10. |
- Tyler, Torbjörn, et al.
(författare)
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Nu startar projekt Skånes Mossor!
- 2007
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Ingår i: Botaniska Notiser. - 0006-8195. ; 140:2, s. 1-6
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Tidskriftsartikel (refereegranskat)abstract
- The Lund Botanical Society 2007-03-23 decided to launch a project with the following aims: 1) to map the frequency and distribution of all bryophytes in the province of Skåne, southernmost Sweden, thereby making way for future studies of changes in the flora, 2) to find and document as many sites as possible for nationally and regionally rare or endangered bryophytes and initiate conservation actions at these sites, 3) to increase our knowledge of the ecological demands of individual taxa, and 4) to enhance the level of knowledge concerning bryophytes among both amateur botanists and professional nature conservationists. The province has been divided into 534 5 x 5 km grid-squares. The central square kilometre within each grid-square will be surveyed and the result used for unbiased estimates of the frequency of each taxon. In addition, within each grid-square, a variable number of special areas which may be presumed to have a rich or unusual bryophyte flora have been preselected for the survey. Additional areas may be selected by the recorders themselves, but the ultimate goal is not to survey the grid-square as a whole. A special determination key and nomenclatural check-list to all 658 taxa hithereto known from the province, as well as various instructions and forms for the volonteer recorders, have been made available on the Internet and a central database with an Internet interface is under way. Various kinds of courses have been initiated with the aim of educating future recorders. The aim is to survey all grid-squares during a 20 year period and the project is now calling for support from bryologists world-wide.
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