Ontologia

HydroBASINS lev08 watershed · #2080020460

Bassin de la Grande Leyre

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 : Gironde, Landes

Pfafstetter: 23213006

Sub-basin area

2 314,7km²

Upstream area

2 314,8km²

Discharge

31,74m³/s

Mean elev.

71m

Administrative coverage

2 dept-equivalent regions (GADM L2)

48 communes (GADM L5)

16 intersecting protected areas

7 more protected areas

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

Species present

6 043 distinct species · 525 256 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

525 256 obs · 90 cellules
Obs. / cellule
≥ 63 861
14 452–63 860
5 807–14 451
3 219–5 806
< 3 219

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 la Grande Leyre : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 114 interactions GloBI sur 6 types (connectance 16.2%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
38
Interactions affichées
114
Connectance
0.162
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°

12,6°C

Annual rain

1 038mm

Moisture idx (CMI)

0,07

Runoff

477mm/an

PET

965mm

AET

720mm

Mean slope

0,7°

Water table

52cm

Forest

89%

Crops

6%

Urban

1%

Protected

95%

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