Ontologia

Rivière· 5 segments

Tverrelva

Crosses 4 administrative regions : Grong, Lierne, Røyrvik, Snåsa

rivière

Total length

895km

Max discharge

20,6m³/s

Max Strahler

4

Segments matched

5

River geography4 admin regions · 0 communes

Parent watershed

hybas-20801679001631 km²

4 administrative regions crossed (GADM L2)

  • Snåsa
    Nord-Trøndelag · Norway
    9.7 km
    in this dpt
  • Grong
    Nord-Trøndelag · Norway
    5.3 km
    in this dpt
  • Røyrvik
    Nord-Trøndelag · Norway
    4.4 km
    in this dpt
  • Lierne
    Nord-Trøndelag · Norway
    0.5 km
    in this dpt

7 intersecting protected areas

1 page = 1 named river (aggregation of 5 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

29 distinct species · 41 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 15 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 Tverrelva : 14 espèces reliées par 12 interactions GloBI sur 3 types (connectance 11.4%, filtre Serrano α=0.2). 1 bulle taxonomique (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
15
Interactions affichées
12
Connectance
0.114
Patrimoniales
0
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

895km

Max discharge

20,6m³/s

Max Strahler

4

Segments matched

5

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