Ontologia

Rivière· 38 segments

Nidelva

Crosses 6 administrative regions : Arendal, Froland, Grimstad, Nissedal, Tvedestrand +1

rivière

Total length

113km

Max discharge

101,5m³/s

Max Strahler

4

Segments matched

38

River geography6 admin regions · 0 communes

Parent watershed

hybas-2080257080578 km²

6 administrative regions crossed (GADM L2)

  • Åmli
    Aust-Agder · Norway
    43.9 km
    in this dpt
  • Froland
    Aust-Agder · Norway
    38.9 km
    in this dpt
  • Arendal
    Aust-Agder · Norway
    15.9 km
    in this dpt
  • Nissedal
    Telemark · Norway
    6.4 km
    in this dpt
  • Grimstad
    Aust-Agder · Norway
    3.8 km
    in this dpt
  • Tvedestrand
    Aust-Agder · Norway
    0.0 km
    in this dpt

10 intersecting protected areas

1 more protected areas

1 page = 1 named river (aggregation of 38 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

341 distinct species · 792 observations

Source: GBIF Occurrence snapshot 2026-05-01.

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 Nidelva : 22 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 52 interactions GloBI sur 5 types (connectance 10.5%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
32
Interactions affichées
52
Connectance
0.105
Patrimoniales
1
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydrology (HydroRIVERS v10)

Total length

113km

Max discharge

101,5m³/s

Max Strahler

4

Segments matched

38

HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.