HydroBASINS lev08 watershed · #2080021280
Bassin de l'Aven
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 : Finistère
Sub-basin area
208,6km²
Upstream area
208,6km²
Discharge
5,74m³/s
Mean elev.
114m
Administrative coverage
10 communes (GADM L5)Available for FRA, RWA
1 intersecting protected areas
Kerdruc
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.14 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 367 distinct species · 24 704 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 l'Aven : 21 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 88 interactions GloBI sur 5 types (connectance 16.7%, filtre Serrano α=0.2). 12 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°
11,0°C
Annual rain
1 026mm
Moisture idx (CMI)
0,33
Runoff
863mm/an
PET
683mm
AET
561mm
Mean slope
2,4°
Water table
126cm
Forest
0%
Crops
43%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)