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    Tytuł:
    Phylogeny of Aconitum subgenus Aconitum in Europe
    Autorzy:
    Boron, P.
    Wroblewska, A.
    Binkiewicz, B.
    Mitka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130708.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Aconitum
    Caucasus Mts
    Europe
    ITS
    molecular clock
    phylogeny
    trnL(UAG)-
    ndhF
    Opis:
    Phylogenetic relations within Aconitum subgen. Aconitum (Ranunculaceae) in Europe are still unclear. To infer the phylogeny of the nuclear (ITS) region and chloroplast intergenic spacer trnL(UAG)-ndhF of the chloroplast DNA (cpDNA), we analyzed 64 accessions within this taxon, 58 from Europe and six from the Caucasus Mts. Nuclear ITS sequences were identical in 51 European and two Caucasian accessions, whereas the remaining sequences were unique. cpDNA sequences could be categorized into five haplotypes, i.e., A–E, including a European-Caucasian Aconitum haplotype B. Ten cpDNA sequences were unique. A 5-bp indel distinguished the diploids from the tetraploids. None of the extant European diploids were basal to the tetraploid local group. A phylogenetic tree based on combined ITS and cpDNA sequences (bayesian inference, maximum likelihood, minimal parsimony) placed Aconitum burnatii (Maritime Alps, Massif Central) and A. nevadense (Sierra Nevada, Pyrenees) in a sister group to all other European species. A Bayesian relaxed clock model estimated the earliest split of the Caucasian species during the Late Miocene [ca. 7 million years ago (Mya)], and the divergence of A. burnatii and A. nevadense from the European genetic stock during the Miocene/Pliocene (ca. 4.4 Mya). Diploids in Europe are likely to be descendants of the Miocene European-Caucasian flora linked with the ancient Asian (arctiotertiary) genetic stock. The origins of the tetraploids remain unclear, and it is possible that some tetraploids originated from local, now extinct diploids. Both the diploids and tetraploids underwent rapid differentiation in the Late Pliocene – Quaternary period.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2020, 89, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in relief of the Azau Valley in Central Caucasus Mts resulting from impact of volcanic activity and glaciers oscillations during the last 1100 years
    Autorzy:
    Łajczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/294899.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    Azau Valley
    Caucasus Mts.
    glacier oscillation
    jökulhlaup effect
    Little Ice Age
    volcanic activity
    Opis:
    I analysed changes in the relief of the partly glaciated Azau Valley in the Central Caucasus, neighbouring to Elbrus volcanic cone (5643m a.s.l.) resulting from intensification of volcanic activity and valley glaciers’ oscillations during the last 1100 years. Field research, analysis of topographic maps and photographs from the last 140 years as well as information in literature were the basis for my work. I identified the most important geomorphological processes modelling the valley: a lava flow, floods of jökulhlaup type, glaciers’ transgressions and recessions, erosion of moraines and mass movements on the slopes. I distinguished eight sections of the Azau Valley varied in their relief and being under the differentiated influence of the listed geomorphological processes. The valley under question, represents the Alpine type area of typical cascade like transfer of waste material from the slope to the valley systems and further along its floor. Hanging tributary valleys on the Azau Valley slopes are valleys exporting waste material while the main valley functions as the valley importing waste material. In the period of absence of visible volcanic activity of Elbrus, the fastest changes in the Azau Valley relief take place during the recession of the valley and slope glaciers and of ice cap on this volcano. Findings proof interdependence of intensity of material aggradation in the valley and the amount of moraine deposits which can quickly erode and be transported to the stream channel, easily accessible weathered material derived from marginal ice-free areas as well as on the volume of ice melting water discharging great loads of sediment.
    Źródło:
    Landform Analysis; 2009, 11; 40-59
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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