Journal of Siberian Federal University. Biology / Distribution and Ecological Characteristics of Astragalus schumilovae Polozhij (Fabaceae), a Narrowly Localized Endemic of the Southeastern Evenkia, Central Siberia

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Issue
Journal of Siberian Federal University. Biology. 2023 16 (2)
Authors
Timoshok, Elena E.; Gureyeva, Irina I.; Raiskaya, Yuliya G.; Timoshok, Evgeniy N.
Contact information
Timoshok, Elena E.: Institute of Monitoring of Climatic and Ecological Systems SB RAS Tomsk, Russian Federation; ; ORCID: 0000-0001-7418-6336; Gureyeva, Irina I.: Tomsk State University Tomsk, Russian Federation; ORCID: 0000-0002-5397-6133; Raiskaya, Yuliya G.: Institute of Monitoring of Climatic and Ecological Systems SB RAS Tomsk, Russian Federation; ORCID: 0000-0002-1012-0327; Timoshok, Evgeniy N.: Institute of Monitoring of Climatic and Ecological Systems SB RAS Tomsk, Russian Federation; ORCID: 0000-0002-9674-1748
Keywords
Astragalus schumilovae; Astragalus schumilovae; endemic; distribution; ecology; life form; South-Eastern Evenki
Abstract

Endemic plant species are of great scientific interest because they determine the identity of the flora. Astragalus schumilovae Polozhij (Fabaceae) is one of the few endemic species known in the northern floras. The work is aimed to characterize the distribution and ecological, coenotic and biological features of A. schumilovae based on the new data obtained in a study of the flora of the Tunguska and Chunya interfluve. According to the data obtained, A. schumilovae is an endemic of south-eastern Evenkia which inhabits periodically disturbed specific ecotopes of the valleys of the Podkamennaya Tunguska, the Chunya and their tributaries – the Chamba, the Khushma, the Verkhnyaya Lakura, the Tetere, the Vanavarka, the Mutorai, the Makikta, and the Ukochit. According to its ecological confinement, A. schumilovae is a stenotopic floodplain species which occurs on floodplains, on sandy, pebbly-sandy, rocky sites with sparse vegetation, and in riparian meadow and forest communities. The projective cover of A. schumilovae in most of the examined habitats does not exceed 1–2 %. In two habitats, on the left bank of the Khushma River and on the right bank of the Verkhnyaya Lakura River at Lake Sredneye, A. schumilovae has a significant projective cover of 10–15 %. A. shumilovae is a long-rooted, monocentric, vegetatively immobile subshrub. Its cenopopulations are characterized by seed renewal exclusively. The long-term existence of cenopopulations even in the most disturbed habitats is ensured by the longevity of individuals, by their long, strong tap roots that securely hold plants and prevent them from being uprooted by ice drift, and by irregular seed reproduction, which is still sufficient for the survival of the species

Pages
129–148
EDN
ZYVJLE
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/150834

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