Rivière· 5 segments
Nianån
Crosses 1 administrative regions : Hudiksvall
Total length
22km
Max discharge
19,2m³/s
Max Strahler
4
Segments matched
5
River geography1 admin regions · 0 communes
1 administrative regions crossed (GADM L2)
- HudiksvallGävleborg · Sweden20.0 kmin this dpt
3 intersecting protected areas
2004486 Blacksås
IUCN IaNature Reserve
SK 576-2002
IUCN IaHabitat Protection Area
SK 55-2003
IUCN IaHabitat Protection Area
1 page = 1 named river (aggregation of 5 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
716 distinct species · 1 539 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 52 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).
Indicateurs du tissu écologique
Tissu écologique de Nianån : 42 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 77 interactions GloBI sur 5 types (connectance 5.8%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology (HydroRIVERS v10)
Total length
22km
Max discharge
19,2m³/s
Max Strahler
4
Segments matched
5
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.