Ontologia

Rivière· 11 segments

Tverråa

Crosses 1 administrative regions : Verdal

rivière

Total length

200km

Max discharge

11,7m³/s

Max Strahler

4

Segments matched

11

River geography1 admin regions · 0 communes

Parent watershed

hybas-20800364601585 km²

1 administrative regions crossed (GADM L2)

  • Verdal
    Nord-Trøndelag · Norway
    33.0 km
    in this dpt

3 intersecting protected areas

1 page = 1 named river (aggregation of 11 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

288 distinct species · 688 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 33 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 Tverråa : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 73 interactions GloBI sur 5 types (connectance 12.3%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
35
Interactions affichées
73
Connectance
0.123
Patrimoniales
2
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

200km

Max discharge

11,7m³/s

Max Strahler

4

Segments matched

11

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