Rare plants of the taiga of Khanty-Mansiysk okrug – Yugra as a reflection history of the territory’s natural development

   For the successful implementation of ecosystem research and forecasting their condition in the future, the history of the development of the territories nature study is of undoubted interest. An important area of such research is the study of the paleogeographic development of the territory of a particular region and the closely related history of flora development. Rare plants can act as an indicator of plant dispersal routes, as studying their distribution helps to understand the genesis of flora and vegetation. Relics traditionally make up a significant proportion of rare plants. At the same time, the relict species is an expression of the historical development of the flora. The purpose of the study was to study possible migration routes of rare vascular plants of Yugra to supplement knowledge about the historical development of the taiga flora of Western Siberia. Paleogeographic analysis was carried out according to the literature data. The names of physico-geographical countries are used for the distribution of vascular plants of the Red Book of Yugra (2024) by flora types. When studying populations or single occurrences of rare plants, traditional methods were used to study the floristic richness of the site, map reconnaissance routes with photographing flora species, conduct geobotanical and geomorphological profiles, describe characteristic landscapes, and perform landscape mapping with characteristics of the relief of a key site. The ontogenetic states of plants were identified according to generally accepted methods. The article presents possible migration routes of rare vascular plants of Yugra to supplement knowledge about the historical development of the taiga flora of Western Siberia. It is shown that the formation of the modern flora of the taiga of Western Siberia occurred mainly in the Holocene as a result of the migration of plants to vacant land areas from neighboring territories: the Urals, the East European Plain, Eastern Siberia, the Arctic and Subarctic belts. In modern conditions, while observing climatic trend towards an increase in average annual air temperatures, flora acts as an indicator of ongoing changes. The further study of the history of the Yugra flora formation is necessary in order to assess the changes taking place and predict further ways of developing vegetation and landscapes in
general.

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