RELICT ELEMENTS OF THE SYZRANKA RIVER BASIN FLORA

Dronin Grigory Valer’evich, Postgraduate student, laboratory of phytodiversity problems, Institute of Ecology of Volga River Basin of the Russian Academy of Sciences (10 Komzina street,Togliatti, Russia), dronin1@bk.ru
Novikova Lyubov’ Aleksandrovna, Doctor of biological sciences, senior research manager, sub-department of general biology and biochemistry, Penza State University (40 Krasnaya street, Penza, Russia), la_novikova@mail.ru
Saksonov Sergey Vladimirovich, Doctor of biological sciences, professor, deputy director for research, head of laboratory of phytodiversity problems, Institute of Ecology of Volga River Basin of the Russian Academy of Sciences (10 Komzina street,Togliatti, Russia), svsaxonoff@yandex.ru

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Background. In order to learn the history of origin and formation of flora and vegetation, identification and study of relict plant species is of great importance. The objective of the work is to study the spread of relict elements in the Syzranka river basin (Middle Volga Region).
Materials and methods. Relict elements in the rivers basin were researched in 2013–2015 by the traditional route method in conjunction with the study of floras of separate areas, especially natural areas of preferential protection, and some literature data.
Results. Since 1890 the literature sources on the Syzranka river basin have described in general 72 species of relict plants, adduced by different authors. The prformed critical analysis showed that relict signs of the river basin have only 13 species. The Pliocene group relicts have 5 species, the Pleistocene – 7 and the Holocene – one; species of the steppe longitudinal group are the dominant ones (62 %). Relic elements display a certain affinity to ecocenotic conditions: 8 species belong to rock-steppe groups.
Conclusions. The flora of the Syzranka river basin includess 13 species of relict elements, 20 species are the «imaginary» relicts.

relict elements, the Syzranka river basin.

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