Ontologia

HydroBASINS lev08 watershed · #2080168030

Bassin de Namsen

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 : Namsos, Overhalla

8% lakePfafstetter: 25108003

Sub-basin area

94,5km²

Upstream area

6 094,6km²

Discharge

221,85m³/s

Mean elev.

183m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Nordelva117 km²

▲ Receives from 2 basins

2 dept-equivalent regions (GADM L2)

3 intersecting protected areas

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

Species present

1 306 distinct species · 6 769 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

6 769 obs · 4 cellules
Obs. / cellule
≥ 6 177
6 177–6 176
391–6 176
391–390
< 391

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 Namsen : 30 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 76 interactions GloBI sur 2 types (connectance 11.4%, filtre Serrano α=0.2). 7 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
37
Interactions affichées
76
Connectance
0.114
Patrimoniales
3
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°

4,3°C

Annual rain

1 415mm

Moisture idx (CMI)

0,69

Runoff

1 332mm/an

PET

441mm

AET

425mm

Mean slope

7,1°

Water table

270cm

Forest

29%

Crops

0%

Urban

0%

Protected

0%

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