Ontologia

HydroBASINS lev08 watershed · #2080432040

Bassin de la Somme Rivière

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 5 administrative regions : Aisne, Nord, Oise, Pas-de-Calais, Somme

3% lakePfafstetter: 23250209

Sub-basin area

1 803,8km²

Upstream area

1 803,8km²

Discharge

20,44m³/s

Mean elev.

89m

Administrative coverage

Hydrographic chain

Drains into

Receives from 0 basins

Source / headwater (no upstream basin)

5 dept-equivalent regions (GADM L2)

312 communes (GADM L5)

17 intersecting protected areas

8 more protected areas

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

Species present

5 709 distinct species · 472 471 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

472 471 obs · 55 cellules
Obs. / cellule
≥ 41 734
17 515–41 733
8 880–17 514
6 531–8 879
< 6 531

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

Ecological tissue

Sample of 38 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 Somme Rivière : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 116 interactions GloBI sur 6 types (connectance 16.5%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
38
Interactions affichées
116
Connectance
0.165
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°

9,9°C

Annual rain

652mm

Moisture idx (CMI)

-0,15

Runoff

337mm/an

PET

764mm

AET

536mm

Mean slope

1,5°

Water table

81cm

Forest

0%

Crops

69%

Urban

3%

Protected

0%

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