HydroBASINS lev08 watershed · #2080021790
Bassin de Ruisseau de la Dufresnière
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 : Manche
Sub-basin area
77,6km²
Upstream area
77,6km²
Discharge
1,67m³/s
Mean elev.
29m
Administrative coverage
16 communes (GADM L5)Available for FRA, RWA
- Huisnes-sur-Mer11.09 km²99% commune
- Servon9.37 km²100% commune
- Courtils8.28 km²100% commune
- Précey7.63 km²100% commune
- Vergoncey7.52 km²96% commune
- Céaux5.57 km²57% commune
- Tanis4.95 km²66% commune
- Crollon4.78 km²100% commune
- Macey4.08 km²69% commune
- La Croix-Avranchin3.61 km²33% commune
- Juilley3.11 km²27% commune
- Pontorson2.47 km²5% commune
- Le Mont-Saint-Michel1.80 km²18% commune
- Villiers-le-Pré0.14 km²2% commune
- Pontaubault0.04 km²2% commune
- Vessey0.02 km²0% commune
4 intersecting protected areas
Baie du Mont Saint-Michel
IUCN Not ReportedWetland of International Importance (Ramsar Site)
16.22 km² overlap
Baie du Mont Saint-Michel
IUCN Not ReportedSpecial Protection Area (Birds Directive)
13.43 km² overlap
Baie du Mont Saint-Michel
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
12.91 km² overlap
Ilot de tombelaine
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
232 distinct species · 935 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 Ruisseau de la Dufresnière : 29 espèces reliées par 82 interactions GloBI sur 5 types (connectance 10.5%, filtre Serrano α=0.2). 11 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°
11,3°C
Annual rain
737mm
Moisture idx (CMI)
-0,03
Runoff
660mm/an
PET
761mm
AET
551mm
Mean slope
1,0°
Water table
89cm
Forest
0%
Crops
58%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)