Ontologia

Ruisseau· 4 segments

Tvärån

Crosses 2 administrative regions : Vindeln, Vännäs

ruisseau

Total length

184km

Max discharge

1m³/s

Max Strahler

2

Segments matched

4

River geography2 admin regions · 0 communes

Parent watershed

hybas-20801756401031 km²

2 administrative regions crossed (GADM L2)

  • Vännäs
    Västerbotten · Sweden
    11.2 km
    in this dpt
  • Vindeln
    Västerbotten · Sweden
    9.2 km
    in this dpt

3 intersecting protected areas

1 page = 1 named river (aggregation of 4 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

1 186 distinct species · 7 292 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 34 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 Tvärån : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 59 interactions GloBI sur 5 types (connectance 9.9%, filtre Serrano α=0.2). 8 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
35
Interactions affichées
59
Connectance
0.099
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

184km

Max discharge

1,0m³/s

Max Strahler

2

Segments matched

4

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