Ontologia

HydroBASINS lev08 watershed · #2080492530

Bassin de la Vilaine

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 2 administrative regions : Loire-Atlantique, Morbihan

7% lakePfafstetter: 23230230

Sub-basin area

77,8km²

Upstream area

9 350,8km²

Discharge

151,05m³/s

Mean elev.

31m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de la Vilaine384 km²

▲ Receives from 2 basins

2 dept-equivalent regions (GADM L2)

7 communes (GADM L5)

1 intersecting protected areas

  • Marais de Vilaine

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    12.70 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

1 375 distinct species · 7 008 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

7 008 obs · 2 cellules
Obs. / cellule
≥ 5 157
5 157–5 156
5 157–5 156
5 157–5 156
< 5 157

Source : GBIF — observations agrégées par hexagones 0.027° × 0.027° (~22km), filtre précision coordonnée < 10 km. Fond carte : OpenFreeMap · © OpenStreetMap.

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).

RègnesAnimalPlanteChampignonBacterie
RelationsPredationParasitismeSymbiosePollinisation
StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de la Vilaine : 34 espèces + 6 bulles famille, 95 interactions GloBI documentées sur 5 types (connectance 12.2%, filtre Serrano α=0.2). Les 6 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).

Espèces affichées
40
Interactions affichées
95
Connectance
0.122
Patrimoniales
0
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

11,5°C

Annual rain

778mm

Moisture idx (CMI)

-0,02

Runoff

517mm/an

PET

792mm

AET

568mm

Mean slope

1,6°

Water table

131cm

Forest

1%

Crops

68%

Urban

2%

Protected

0%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)