Ruisseau· 2 segments
赤堀川
Crosses 4 administrative regions : Ichikai, Mōka, Nikkō, Utsunomiya
Total length
41km
Max discharge
0,3m³/s
Max Strahler
1
Segments matched
2
River geography4 admin regions · 0 communes
4 administrative regions crossed (GADM L2)
- MōkaTochigi · Japan7.0 kmin this dpt
- NikkōTochigi · Japan6.2 kmin this dpt
- IchikaiTochigi · Japan0.0 kmin this dpt
- UtsunomiyaTochigi · Japan0.0 kmin this dpt
5 intersecting protected areas
Osawa
IUCN IVPrefectural Wildlife Protection Area
Nemotoyama
IUCN IVPrefectural Wildlife Protection Area
National Natural Monument
Nemotoyama
IUCN VGreen Space Environment Conservation Area(Tochigi)
Ouchi higashi shogakko
IUCN IVPrefectural Wildlife Protection Area
1 page = 1 named river (aggregation of 2 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
323 distinct species · 901 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 赤堀川 : 25 espèces reliées par 60 interactions GloBI sur 4 types (connectance 9.5%, filtre Serrano α=0.2). 11 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
41km
Max discharge
0,3m³/s
Max Strahler
1
Segments matched
2
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.