HydroBASINS lev08 watershed · #2080575920
Bassin du Bergons
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 3 administrative regions : Gers, Hautes-Pyrénées, Pyrénées-Atlantiques
Sub-basin area
236,8km²
Upstream area
2 455,8km²
Discharge
43,13m³/s
Mean elev.
143m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Arros911 km²
- Bassin de l'Estéous391 km²
3 dept-equivalent regions (GADM L2)
- 176.7 km²74.5% of basin
- 31.5 km²13.3% of basin
- 29.1 km²12.3% of basin
41 communes (GADM L5)Available for FRA, RWA
- Riscle29.17 km²90% commune
- Viella17.07 km²75% commune
- Madiran13.55 km²90% commune
- Saint-Mont12.51 km²100% commune
- Lelin-Lapujolle12.27 km²91% commune
- Saint-Lanne12.24 km²88% commune
- Barcelonne-du-Gers12.08 km²59% commune
- Labarthète10.68 km²99% commune
- Saint-Germé9.40 km²100% commune
- Maumusson-Laguian8.91 km²100% commune
- Corneillan8.82 km²100% commune
- Sarragachies8.48 km²67% commune
- Arblade-le-Bas7.66 km²100% commune
- Aydie6.59 km²84% commune
- Caumont6.30 km²91% commune
- Vergoignan6.21 km²60% commune
- Crouseilles6.18 km²79% commune
- Maulichères6.00 km²94% commune
- Bétracq4.71 km²100% commune
- Arrosès4.50 km²46% commune
- Tarsac4.44 km²100% commune
- Bernède4.34 km²54% commune
- Castelnau-Rivière-Basse3.37 km²19% commune
- Luppé-Violles2.89 km²37% commune
- Gée-Rivière2.80 km²100% commune
- Monpezat2.31 km²71% commune
- Moncaup2.07 km²18% commune
- Lasserre2.02 km²50% commune
- Lannux1.94 km²15% commune
- Termes-d'Armagnac1.94 km²19% commune
- Cannet1.92 km²37% commune
- Soublecause1.32 km²21% commune
- Aubous0.70 km²20% commune
- Aurensan0.52 km²8% commune
- Hagedet0.52 km²22% commune
- Lascazères0.51 km²6% commune
- Izotges0.13 km²4% commune
- Saint-Martin-d'Armagnac0.10 km²1% commune
- Le Houga0.06 km²0% commune
- Sorbets0.03 km²0% commune
- Saint-Griède0.01 km²0% commune
1 intersecting protected areas
Vallée de l'Adour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.44 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 955 distinct species · 86 797 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 du Bergons : 28 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 114 interactions GloBI sur 6 types (connectance 13.2%, filtre Serrano α=0.2). 14 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°
12,4°C
Annual rain
874mm
Moisture idx (CMI)
-0,12
Runoff
496mm/an
PET
989mm
AET
697mm
Mean slope
2,7°
Water table
149cm
Forest
4%
Crops
89%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)