| 1. |
- Andersson Cederholm, Erika, et al.
(författare)
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Resenär - inte turist!
- 2002
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Ingår i: Resenär - inte turist!: Om ungdomar, resor och drömmar. - 0283-2976. ; årsbok 2003, s. 26-42
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Bokkapitel (populärvet., debatt m.m.)
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| 2. |
- O'Dell, Thomas, et al.
(författare)
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Risken att bli kvar
- 2002
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Ingår i: Resenär - Inte turist! Om ungdomar, resor och drömmar. - 0283-2976. ; , s. 154-173
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Bokkapitel (populärvet., debatt m.m.)
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| 3. |
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| 4. |
- Schiemann, Katarina, et al.
(författare)
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Allozyme diversity in relation to geographic distribution and population size in Lathyrus vernus (L.) Bernh. (Fabaceae)
- 2000
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Ingår i: Plant Systematics and Evolution. - 1615-6110. ; 225:1-4, s. 119-132
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Tidskriftsartikel (refereegranskat)abstract
- Lathyrus vernus (L.) Bernh. is a diploid, long-lived perennial and insect-pollinated herb with no special adaptation to long-distance dispersal. It occurs on neutral soil in deciduous forests throughout western Eurasia. Due to specific habitat preferences, L. vernus has a fragmented distribution with isolated populations. We investigated allozyme variation at eleven loci in 20 populations of L. vernus from one geographically central region (the Czech Republic and the Slovak Republic) and two geographically marginal regions (southern and central Sweden) in the species present-day distribution. There was a clear differentiation between the three regions and the genetic distance between the populations was highly correlated with geographic distance. The total genetic diversity (H-T) was 0.354. The proportion of genetic diversity due to differentiation between regions, and to differentiation between populations within regions, accounted for 10% each. There was no difference in level of genetic diversity between the three regions. No significant difference in level of genetic diversity was found between small and large populations. The genetic diversity in L. vernus may either be a result of the long generation-time of the species or peculiarities in the post-glacial migration species, e.g, survival only in refugia far east of the sampled populations and/or migration as a continuous process not involving founder-events.
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| 5. |
- Tyler, Torbjörn, et al.
(författare)
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Geographic variation and dispersal history in Fennoscandian populations of two forest herbs
- 2002
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Ingår i: Plant Systematics and Evolution. - : Springer Science and Business Media LLC. - 1615-6110 .- 0378-2697. ; 233:1-2, s. 47-64
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Tidskriftsartikel (refereegranskat)abstract
- Carex digitata and Melica nutans are forest understorey herbs with wide European distributions and their northern range margins in Fennoscandia. The species have closely similar habitat requirements, occur in small populations in old forest stands on base-rich to neutral soils and have restricted dispersal abilities at the present day. This study investigates the structure of allozyme variation (12 and 8 loci, respectively) in material of both species (38 and 37 populations, respectively) from throughout southern Sweden and southern Finland. Both species show a relatively low overall genetic diversity (HT excluding monomorphic loci = 0.17 and 0.18, respectively). The hierarchic structuring of allelic diversity in the species is similar, with a relatively high between-population component of diversity (G(ST) = 0.36 and 0.37. respectively). Neither of the species shows a clear intraspecific pattern of geographic differentiation. The lack of large-scale patterns of geographic differentiation is not consistent with a simple scenario of discrete and independent waves of immigration into Fermoscandia. However, particularly in M. nutans, a group of populations from a lowland belt across southwestern Finland and southern central Sweden is somewhat differentiated from populations to the north and south. A number of rare alleles in both species are widely, but patchily distributed in low frequencies. Hybridization may account for the scattered occurence of some of the rare alleles in Carex digitata, but cannot explain the distribution of rare alleles in Melica nutans.
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