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  • 1
    Keywords: Life sciences ; Regional planning ; Architecture ; Urban Ecology ; Renewable energy sources ; Environmental Pollution ; Life sciences ; Urban Ecology ; Architecture, general ; Landscape/Regional and Urban Planning ; Renewable and Green Energy ; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution ; Springer eBooks
    Pages: : digital
    ISBN: 9789400712942
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  • 2
    ISSN: 1573-5052
    Keywords: Epidermal properties ; Birch hybridization ; Stomatal index ; Stomatal density ; Palaeoatmospheric CO2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Fennoscandian birch population primarily consists of Betula nana, B. pendula and B. pubescens ssp. czerepanovii, the Mountain birch. Frequent hybridization between the Mountain birch and B. nana generates a wide range of genotypic and phenotypic plasticity in the subarctic birch zone of Fennoscandia. Phases of subarctic conditions prevailed during the Late Glacial in large parts of NW Europe, and palynological as well as macrofossil analysis provide some evidence for the occurrence of birch hybrids during these intervals. Leaves from genetically controlled specimens of Betula pendula, B. pubescens ssp. czerepanovii, B. nana and the hybrids B. pubescens ssp. czerepanovii × nana and B. nana × pubescens ssp. czerepanovii are investigated for their specific characteristics of the epidermis morphology. Frequency and size of epidermal cells and stomata reveal a close affinity of both hybrids to B. nana and allow a differentiation of the intermediate forms between B. nana and the Mountain birch. With respect to palaeoatmospheric CO2 reconstructions based on stomatal index, epidermal analysis shows that a possible occurrence of hybrids in fossil leaf assemblages has no profound consequences for combined species records. However, the significant differences observed in B. nana demand the separation of this species. A comparison of the cuticle properties of B. pendula and B. pubescens from Finnish Lapland and leaf material from The Netherlands reveals a divergence of the stomatal index that may be due to differences in day light length.
    Type of Medium: Electronic Resource
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