HydroBASINS lev08 watershed · #2080523440
Bassin de la Guirande
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 : Deux-Sèvres
Sub-basin area
174km²
Upstream area
174km²
Discharge
3,11m³/s
Mean elev.
41m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
1 dept-equivalent regions (GADM L2)
- 174.4 km²100.0% of basin
19 communes (GADM L5)Available for FRA, RWA
- Prahecq25.27 km²100% commune
- Aiffres23.28 km²90% commune
- Frontenay-Rohan-Rohan22.07 km²65% commune
- Saint-Symphorien18.35 km²97% commune
- Sainte-Blandine15.81 km²97% commune
- Mougon11.39 km²53% commune
- Fors10.58 km²57% commune
- Saint-Martin-de-Bernegoue9.66 km²55% commune
- Vouillé6.72 km²30% commune
- Bessines6.58 km²58% commune
- Sansais6.20 km²42% commune
- Brûlain5.06 km²21% commune
- Thorigné4.77 km²26% commune
- Magné4.51 km²31% commune
- Celles-sur-Belle2.43 km²6% commune
- Niort1.24 km²2% commune
- Granzay-Gript0.34 km²2% commune
- Amuré0.09 km²1% commune
- Saint-Médard0.04 km²1% commune
9 intersecting protected areas
Plaine de Niort Sud-Est
IUCN Not ReportedSpecial Protection Area (Birds Directive)
78.42 km² overlap
Marais Poitevin
IUCN VRegional Nature Park
59.04 km² overlap
Marais poitevin
IUCN Not ReportedSpecial Protection Area (Birds Directive)
8.51 km² overlap
Marais Poitevin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.51 km² overlap
Marais poitevin
IUCN IIIWetland of International Importance (Ramsar Site)
8.51 km² overlap
Venise Verte
IUCN IVBiotope Protection Order
5.59 km² overlap
marais de la garette
IUCN IVLand acquired by a regional conservatory of natural areas
0.34 km² overlap
Land acquired by a regional conservatory of natural areas
0.13 km² overlap
les pierrailleuses - mc
IUCN IVLand acquired by a regional conservatory of natural areas
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 776 distinct species · 49 271 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 Guirande : 34 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 82 interactions GloBI sur 5 types (connectance 9.1%, filtre Serrano α=0.2). 9 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°
12,1°C
Annual rain
809mm
Moisture idx (CMI)
-0,08
Runoff
526mm/an
PET
878mm
AET
607mm
Mean slope
0,8°
Water table
33cm
Forest
0%
Crops
65%
Urban
2%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)