Ontologia

HydroBASINS lev08 watershed · #2080488850

Bassin de Canal de Nantes à Brest - L'Oust Canalisé

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 : Morbihan

2% lakePfafstetter: 23230243

Sub-basin area

73,9km²

Upstream area

2 510,4km²

Discharge

47,65m³/s

Mean elev.

42m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de l'Arz350 km²

1 dept-equivalent regions (GADM L2)

9 communes (GADM L5)

1 intersecting protected areas

  • Marais de Vilaine

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    6.25 km² overlap

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

Species present

2 158 distinct species · 48 692 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

48 692 obs · 8 cellules
Obs. / cellule
≥ 17 281
17 281–17 280
5 878–17 280
4 970–5 877
< 4 970

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

Ecological tissue

Sample of 37 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 Canal de Nantes à Brest - L'Oust Canalisé : 24 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 112 interactions GloBI sur 6 types (connectance 16.8%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
37
Interactions affichées
112
Connectance
0.168
Patrimoniales
2
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°

11,4°C

Annual rain

784mm

Moisture idx (CMI)

0,01

Runoff

541mm/an

PET

774mm

AET

564mm

Mean slope

2,4°

Water table

234cm

Forest

0%

Crops

63%

Urban

0%

Protected

0%

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