Ontologia

HydroBASINS lev08 watershed · #2080022150

Bassin de la Seine

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 : Eure, Seine-Maritime

3% lakePfafstetter: 23240100

Sub-basin area

1 953,2km²

Upstream area

73 249,2km²

Discharge

553,53m³/s

Mean elev.

101m

Administrative coverage

Hydrographic chain

▼ Drains into

Outlet (drains to ocean / endorheic)

▲ Receives from 2 basins

2 dept-equivalent regions (GADM L2)

290 communes (GADM L5)

27 intersecting protected areas

18 more protected areas

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

Species present

8 780 distinct species · 588 808 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

588 808 obs · 58 cellules
Obs. / cellule
≥ 40 435
22 749–40 434
10 113–22 748
7 651–10 112
< 7 651

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

Ecological tissue

Sample of 31 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 Seine : 17 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 121 interactions GloBI sur 6 types (connectance 26.0%, filtre Serrano α=0.2). 14 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
31
Interactions affichées
121
Connectance
0.260
Patrimoniales
1
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°

10,3°C

Annual rain

698mm

Moisture idx (CMI)

-0,10

Runoff

569mm/an

PET

779mm

AET

547mm

Mean slope

2,7°

Water table

145cm

Forest

11%

Crops

35%

Urban

17%

Protected

27%

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