Ontologia

HydroBASINS lev08 watershed · #2080459960

Bassin de l'Yerres

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 4 administrative regions : Essonne, Seine-et-Marne, Val-de-Marne, Yvelines

2% lakePfafstetter: 23240610

Sub-basin area

2 200,5km²

Upstream area

30 654,8km²

Discharge

215,43m³/s

Mean elev.

117m

Administrative coverage

Hydrographic chain

Drains into

Receives from 2 basins

4 dept-equivalent regions (GADM L2)

288 communes (GADM L5)

20 intersecting protected areas

11 more protected areas

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

Species present

11 670 distinct species · 2 450 982 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

2 450 982 obs · 68 cellules
Obs. / cellule
≥ 108 988
87 077–108 987
45 164–87 076
29 667–45 163
< 29 667

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

Ecological tissue

Sample of 32 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 l'Yerres : 24 espèces reliées par 109 interactions GloBI sur 6 types (connectance 20.6%, filtre Serrano α=0.2). 9 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
33
Interactions affichées
109
Connectance
0.206
Patrimoniales
0
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°

10,7°C

Annual rain

645mm

Moisture idx (CMI)

-0,21

Runoff

196mm/an

PET

820mm

AET

543mm

Mean slope

1,4°

Water table

151cm

Forest

12%

Crops

45%

Urban

30%

Protected

17%

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