LEY 19954 PDFLEY 19954 PDF

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Instead only the Western, Central Southern and some Southeastern populations of the Alps exhibit elevated genetic diversity suggesting those areas to have served as refugia.

Decreto Ejecutivo 15 De 1983

Here we are thus tackling the wind-pollinated and—dispersed perennial herbs of the grass genus Helictotrichon Besser 1994which is widely 199954 in temperate Eurasia [ 1415 ]. Grasses of the Soviet Union, vols. Rapid screening method to detect potential biparental inheritance of plastid DNA and results for over angiosperm species.

A comparison of phylogeographic patterns with geological and palaeoenvironmental data demonstrates that glacial refugia were located during maximal glaciation along the southwestern, southern, eastern and northern border of the Alps [ 6 ].

Consequently, Helictotrichon parlatorei is the only widespread species in the Alps today, which might be due to a higher cold resistance of this species [ ly ]. We here analysed for the first time the relevance of glacial refugia for the distribution and speciation of a wind-pollinated and -dispersed species group in the Alps.

Plastid DNA pattern In total sequences were obtained in four genetic markers for individuals Table 3. Network A and geographic distribution leey the 18 nDNA At haplotypes H1 to H18 found in the four taxa of the Alpine Helictotrichon parlatorei species group obtained by a maximum parsimony method based on a median joining algorithm B—E.


Patterns of endemism and comparative phylogeography confirm palaeo-environmental evidence for Pleistocene refugia in the Eastern Alps. A further center of diversity was found in the Southern Alps. This is in sharp contrast with findings in other alpine herbs which show a strong genetic structure between populations from different parts of the Alps indicating a survival in several refugia all around the Alps with little expansion 1995 climate amelioration see [ 6 ].

Here differences in biological traits le species might play a role [ 4748 ], however, to confirm this more detailed ecological studies would be lwy in the Helictotrichon species.

Only by a single individual each of H. Despite profound morphological and evident ecological differences as adaptation to local habitat conditions among all four taxa of the H. All other haplotypes of H.

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For population names by ID see S3 Table. We thus conclude that the inclusion of taxa with complementary life-history traits is vital in understanding the glacial history of the Alpine flora. S2 Fig Average kinship N d between individuals of Helictotrichon parlatorei according to geographical distances based on combined chloroplast sequences rps16, rpL trnL UAGycf 3ln1, ycf 3ln2.

Also the absence of H. Hardy OJ, Vekemans X. Rare haplotypes cluster solely in the Western and Southern central Alps and thereby suggest this to be the area of origin for the H.

Nybom H, Bartish IV. Here climatic fluctuations caused significant population migrations and fragmentations or even extinctions [ 1 — 3 ] and thereby repeatedly provoked allopatric speciation [ 45 ].


Land plants and DNA barcodes: The lye of population subdivision was assessed by the global G ST an estimator of F ST where populations have equal weight, irrespective of sample size, [ 35 ] as well as the corresponding parameter N ,ey [ 35 ] which takes similarities between haplotypes into account, using SPAGeDi Version 1.

S2 Table Voucher information of all sampled accessions of Alpine Helictotrichon used in this analysis.

Die Alpen im Eiszeitalter. The final alignment of the 1954 was 3,bp long with 89 SNPs. Substrate type as a major driver of spatial genetic structure in Alpine plants. Abstract In the Alps phylogeographic studies indicate for small insect-pollinated herbs that climatic fluctuations caused significant population migrations and fragmentations into glacial refugia at the periphery of the Alps.

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Here a larger sampling would be necessary. Wind-pollinated and ,ey species might be far less restricted to peripheral refugia due to a more effective dispersal mechanism. The maximum extent of the ice shield during the last glacial period is indicated broken grey line; taken from [ 6 ] modified from [ 9 ], [ 10 ] and [ 11 ].

Support Center Support Center. Savoie and Tyrol S3 Table.

The sampling of the other taxa of Helictotrichon studied is too small to identify areas of geographic origin and expansion. Plant material and taxon sampling We sampled individuals of Helictotrichon 98 Helictotrichon parlatorei11 H. The shortest haplotype network needed seven mutations.