HydroBASINS lev08 watershed · #2080503220
Bassin de la Sèvre Nantaise
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 1 administrative regions : Loire-Atlantique
Sub-basin area
5,7km²
Upstream area
114 088,7km²
Discharge
981,56m³/s
Mean elev.
14m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Sèvre Nantaise2341 km²
- Bassin de la Loire2003 km²
1 dept-equivalent regions (GADM L2)
- 5.7 km²100.0% of basin
2 communes (GADM L5)Available for FRA, RWA
2 intersecting protected areas
Estuaire de la Loire
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.67 km² overlap
Estuaire de la Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.64 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 325 distinct species · 29 304 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 44 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 la Sèvre Nantaise : 37 espèces + 7 bulles famille, 86 interactions GloBI documentées sur 4 types (connectance 9.1%, filtre Serrano α=0.2). Les 7 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
11,7°C
Annual rain
782mm
Moisture idx (CMI)
-0,05
Runoff
504mm/an
PET
826mm
AET
579mm
Mean slope
1,0°
Water table
71cm
Forest
0%
Crops
8%
Urban
100%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)