Peculiarities of the floristic composition and phytocenotic spectra of the prospective conservation area “Siverga” (Tyumen Oblast, Russia)

The coastal zone of the Lake Siverga (Tyumen Oblast, Russia) is characterized by a high level of floristic and phytocenotic diversity, which significantly increases the conservation status of the prospective protected area “Siverga”, limited by the coastline of the lake. Twelve vascular plants species included into the Red List of the Tyumen Oblast have been found on the surveyed territory. The plant communities, which are extremely rare in the region, have been observed on the coastal salt marshes; these communities have been previously noted only in the southern areas of the European part of Russia. Taking into account these results, we argue for expanding the boundaries of the protected natural area, which must include the floodplain areas and slopes of the floodplain terrace adjacent to the lake water area.