HydroBASINS lev08 watershed · #2080367640
Bassin de Большой Иргиз
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 : Bol'shechernigovskiy rayon, Bol'sheglushitskiy rayon, Krasnoarmeyskiy rayon, Pestravskiy rayon
Sub-basin area
1 064,8km²
Upstream area
4 622,2km²
Discharge
11,41m³/s
Mean elev.
90m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Каралык792 km²
- Bassin de Большой Иргиз87 km²
4 dept-equivalent regions (GADM L2)
- Bol'sheglushitskiy rayonSamara · Russia718.4 km²67.2% of basin
- Pestravskiy rayonSamara · Russia302.3 km²28.3% of basin
- Krasnoarmeyskiy rayonSamara · Russia28.2 km²2.6% of basin
- Bol'shechernigovskiy rayonSamara · Russia20.0 km²1.9% of basin
2 intersecting protected areas
Irgizskaya pojma
IUCN IIINatural Monument
3.42 km² overlap
Kolok Duboven`kij
IUCN IIINatural Monument
2.34 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
120 distinct species · 434 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Большой Иргиз : 35 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 55 interactions GloBI sur 4 types (connectance 7.4%, filtre Serrano α=0.2). 4 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°
4,9°C
Annual rain
470mm
Moisture idx (CMI)
-0,39
Runoff
95mm/an
PET
766mm
AET
401mm
Mean slope
1,2°
Water table
174cm
Forest
0%
Crops
69%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)