Abstract

The paper summarises and systematises the results of studies on the population structure of the Karelian (curly) birch Betula pendula Roth var. carelica (Mercklin) Hämet-Ahti, a unique member of the fo-rest tree flora in the Baltic macroregion. Characteristics of the spatial, ecological, age, sex, and genetic structures of Karelian birch populations are described. Comparison with its close relatives (silver birch and downy birch) regarding these parameters shows that the Karelian birch is notably different, although it is considered a variety of the silver birch. The authors take it as another weighty argument in favour of the earlier conclusion that the Karelian birch does fulfill the requirements to be considered a separate biological species.

中文翻译：

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卡累利阿桦种群结构的具体特征

摘要

本文对卡累利阿（卷曲）白桦Betula pendula Roth var种群结构的研究结果进行总结和系统化。carelica (Mercklin) Hämet-Ahti，波罗的海大区森林植物区系的独特成员。描述了卡累利阿桦树种群的空间、生态、年龄、性别和遗传结构的特征。关于这些参数与其近亲（银桦和绒毛桦）的比较表明，卡累利阿桦明显不同，尽管它被认为是银桦的变种。作者认为这是另一个有力的论据，支持早先的结论，即卡累利阿桦确实满足被视为独立生物物种的要求。