| Ecosysteem | Type | Status | Ref. |
|---|---|---|---|
| Don | River (basin) | native | 26334 |
| Emba River | River (basin) | native | 59043 |
| Kama | River (basin) | native | 59043 |
| Oka | River (basin) | native | 59043 |
| Palearctic | Zoogeographic realm | endemic | 26334 |
| Ural | River (basin) | native | 26334 |
| Volga | River (basin) | native | 26334 |