LEY 19954 PDF

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Author information Article notes Copyright and License information Disclaimer. For the nuclear and all combined plastid markers haplotypes were identified using DnaSP Version 5.

The respective individuals showed the same nuclear and plastid haplotypes as any other individual. It was thus widely distributed along the southern flank of the Alps. A few tetraploid populations are known from the Western Alps [ 17 ]. Xantha-1 encodes a membrane subunit of the aerobic Mg-protoporphyrin IX monomethyl ester cyclase involved in chlorophyll biosynthesis. The level of population structure G ST in H. Among the species of the H.

It was quite dominant in the eastern region in H. Discussion 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. This fragmentation of a once continuous range seems ldy likely than long-distance dispersal across the almost entire Alpine Arc. The entire Eastern Alps are overall rather genetically depauperate indicating a recent colonization via efficient long distance wind dispersal.

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Quite similar habitats are occupied by subsp. Species identifications were thoroughly verified. Here climatic fluctuations caused significant population migrations and fragmentations or even extinctions [ 1 — 3 ] and thereby repeatedly provoked allopatric speciation [ 45 ]. 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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The impact of study design and life history leh on genetic variation of plants determined with AFLPs. Introduction The current distribution and intraspecific genetic structure of alpine species is thought to be mainly shaped by climatic conditions of the past.

Detailed morphological field-investigations indicate the presence of morphological intermediates between H.

The absence along the northern flank of the Swiss Alps with limestone, however, remains unexplained. International quaternary map of EuropeB10 Bern. Potential sisters occur in the Northeast of the Alps continental H.

There are no genetic differences between di- let tetraploids in H. We thank Laura Freisleben Halle for technical support in laboratory work. National Center for Biotechnology InformationU.

Its distribution area is widely congruent with the regions of the Alps which remained unglaciated during the last glacial period [ 1819 ].

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Also H1 was rather widespread but only found in H. Each species occupies a characteristic habitat: Genetic differentiation among populations of Sesleria albicans Kit. Pons O, Petit RJ. S3 Table Sampled populations for the phylogeographic analyses of the Alpine Helictotrichon species. Based on morphological similarities Melzer [ 27 ], however, hypothesized that an ancestor of H. The maximum extent of the Pleistocene ice shield during the last glacial period was taken from [ 6 ] modified from [ 10 — 12 ].

Gene flow and species delimitation. 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 at climate amelioration see [ 6 ]. Four groups of 1 to 11 haplotypes connected loosely to this center at the haplotypes H4, H7, H8 and H23 with one to 6 mutations between adjacent haplotypes.

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Phylogeographical history of the widespread meadow fescue Festuca pratensis Huds. The 199954 distribution of haplotypes was visualized in Q-GIS [ 32 ] summarizing individuals from nearby let to a single population per area S3 Table. The laboratory protocol is available under dx. It is difficult to distinguish between both mechanisms here, as the distribution ranges and collection sizes of H. Plant material and taxon sampling We sampled individuals of Helictotrichon 98 Helictotrichon parlatorei11 H.

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The genetic diversity of H. The network contained three frequent haplotypes: To confirm those results we suggest enlarging the current sampling of individuals and independent loci. Distribution of the four taxa of the Alpine species group of Helictotrichon parlatorei species group original maps.

Wind-pollinated and wind-dispersed species might be far less restricted to peripheral refugia due to a more effective dispersal mechanism. In the Western Alps it can also be found in light subalpine Larix forests or even higher in thermophilic alpine Sesleria grassland. Patterns of endemism and comparative phylogeography confirm palaeo-environmental evidence for Pleistocene refugia 1995 the Eastern Alps.

The level of population structure G ST was 0.

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