Ontologia

Rivière· 41 segments

Viskan

Crosses 4 administrative regions : Borås, Mark, Ulricehamn, Varberg

rivière

Total length

154km

Max discharge

39,8m³/s

Max Strahler

4

Segments matched

41

River geography4 admin regions · 0 communes

Parent watershed

hybas-20800331902177 km²

4 administrative regions crossed (GADM L2)

  • Borås
    Västra Götaland · Sweden
    54.7 km
    in this dpt
  • Mark
    Västra Götaland · Sweden
    52.4 km
    in this dpt
  • Ulricehamn
    Västra Götaland · Sweden
    23.3 km
    in this dpt
  • Varberg
    Halland · Sweden
    20.0 km
    in this dpt

30 intersecting protected areas

21 more protected areas

1 page = 1 named river (aggregation of 41 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

1 179 distinct species · 19 299 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 24 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 Viskan : 12 espèces reliées par 72 interactions GloBI sur 4 types (connectance 22.2%, filtre Serrano α=0.2). 14 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
26
Interactions affichées
72
Connectance
0.222
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

154km

Max discharge

39,8m³/s

Max Strahler

4

Segments matched

41

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