Ontologia

Ruisseau· 4 segments

Björnån

Crosses 2 administrative regions : Härjedalen, Ljusdal

ruisseau

Total length

86km

Max discharge

3,6m³/s

Max Strahler

3

Segments matched

4

River geography2 admin regions · 0 communes

Parent watershed

hybas-20802014701843 km²

2 administrative regions crossed (GADM L2)

  • Ljusdal
    Gävleborg · Sweden
    10.1 km
    in this dpt
  • Härjedalen
    Jämtland · Sweden
    2.6 km
    in this dpt

8 intersecting protected areas

  • Voxnan

    IUCN III

    Natura 2000 SCI

  • Voxnan

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

  • Voxnan (Jämtlands län)

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

  • Voxnan (Jämtlands län)

    IUCN Not Assigned

    Natura 2000 SCI

  • A575424

    IUCN Not Applicable

    Voluntary set-aside areas

  • A576897

    IUCN Not Applicable

    Voluntary set-aside areas

  • A577599

    IUCN Not Applicable

    Voluntary set-aside areas

  • A277553

    IUCN Not Applicable

    Voluntary set-aside areas

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

Species present

306 distinct species · 2 371 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 38 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 Björnån : 29 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 68 interactions GloBI sur 5 types (connectance 8.3%, filtre Serrano α=0.2). 12 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
41
Interactions affichées
68
Connectance
0.083
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

86km

Max discharge

3,6m³/s

Max Strahler

3

Segments matched

4

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