HydroBASINS lev08 watershed · #2080323440
Bassin de Сельдь
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 4 administrative regions : Maynskiy rayon, Tsil'ninskiy rayon, Ul'yanovsk, Ul'yanovskiy rayon
Sub-basin area
999,7km²
Upstream area
999,7km²
Discharge
3,16m³/s
Mean elev.
191m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- Maynskiy rayonUl'yanovsk · Russia634.1 km²63.2% of basin
- Ul'yanovskiy rayonUl'yanovsk · Russia335.0 km²33.4% of basin
- Ul'yanovskUl'yanovsk · Russia26.9 km²2.7% of basin
- Tsil'ninskiy rayonUl'yanovsk · Russia8.1 km²0.8% of basin
2 intersecting protected areas
Majnskij
IUCN IVState Natural Zakaznik
50.93 km² overlap
PKO Sem`i Ul`yanovyh
IUCN Not ReportedLandscape Park
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
683 distinct species · 2 176 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de Сельдь : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 95 interactions GloBI sur 5 types (connectance 12.2%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
4,0°C
Annual rain
533mm
Moisture idx (CMI)
-0,22
Runoff
100mm/an
PET
686mm
AET
449mm
Mean slope
1,3°
Water table
140cm
Forest
19%
Crops
66%
Urban
3%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)