HydroBASINS lev08 watershed · #2080572440
Bassin de la Midouze
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 : Landes
Sub-basin area
42,1km²
Upstream area
2 006,4km²
Discharge
27,22m³/s
Mean elev.
72m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Midour803 km²
- Bassin de la Douze298 km²
1 dept-equivalent regions (GADM L2)
- 42.2 km²100.0% of basin
7 communes (GADM L5)Available for FRA, RWA
- Saint-Pierre-du-Mont21.79 km²83% commune
- Mont-de-Marsan14.09 km²38% commune
- Saint-Avit2.30 km²6% commune
- Campet-et-Lamolère1.48 km²8% commune
- Saint-Perdon1.24 km²4% commune
- Uchacq-et-Parentis1.16 km²3% commune
- Benquet0.11 km²0% commune
2 intersecting protected areas
Réseau hydrographique des affluents de la Midouze
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.49 km² overlap
Réseau hydrographique du Midou et du Ludon
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 883 distinct species · 23 386 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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 la Midouze : 28 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 113 interactions GloBI sur 6 types (connectance 13.1%, 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°
12,7°C
Annual rain
996mm
Moisture idx (CMI)
-0,01
Runoff
551mm/an
PET
1 007mm
AET
726mm
Mean slope
1,4°
Water table
72cm
Forest
60%
Crops
10%
Urban
45%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)