| Сontributors | A. A. Zorina, Ph. D. (Biology), Associate Professor, Federal State Budgetary Educational Institution of Higher Education of Petrozavodsk State University (PetrSU), This email address is being protected from spambots. You need JavaScript enabled to view it., Petrozavodsk, Russia |
| Abstract | To assess the level of fluctuating asymmetry (FA) of Betula pendula and B. pubescens, the data were collected in three regions of the Russia North-West (Leningrad, the Murmansk Region, the Republic of Karelia) in 14 territories. The efficiency of two estimations is considered: by the method of E.M. Zakharov (FA1) and on the basis of normalized deviation (FA2). Significantly high levels of FA were observed in the territories of urban dumps, in the vicinity of the Volkhov Aluminum Plant in the Leningrad Region and Kostomuksha Ore Mining and Processing Plant in Karelia. A coordinated response of birch species to different habitats was found, which is determined by the similarity of the sites clustering with different types of anthropogenic activities according to trees’ FA2 and reliable latitudinal variability of asymmetry level for both species. The North of the territory, the lower the level of trees stability is observed. On the basis of the same data FA1 and FA2 showed different results, due to the difference in the normalization and other arithmetic transformations of the original data, as well as the need to apply the criteria of different accuracy. According to the degree of fluctuating asymmetry level variability, it was found that from 18 to 36 % of birch leaf signs could be attributed to morphometric indicators of tree development stability. |
| Keywords | fluctuating asymmetry, estimations of asymmetry, factors influence, Betula pendula, Betula pubescens, morphometric characteristics. |
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