Rivière· 29 segments
久慈川
Crosses 9 administrative regions : Daigo, Hanawa, Hitachi, Hitachiōmiya, Hitachiōta +4
Total length
138km
Max discharge
34m³/s
Max Strahler
4
Segments matched
29
River geography9 admin regions · 0 communes
9 administrative regions crossed (GADM L2)
- HitachiōmiyaIbaraki · Japan23.8 kmin this dpt
- TanaguraFukushima · Japan18.3 kmin this dpt
- NakaIbaraki · Japan16.2 kmin this dpt
- DaigoIbaraki · Japan15.1 kmin this dpt
- HanawaFukushima · Japan7.6 kmin this dpt
- TōkaiIbaraki · Japan4.7 kmin this dpt
- YamatsuriFukushima · Japan3.2 kmin this dpt
- HitachiōtaIbaraki · Japan0.7 kmin this dpt
- HitachiIbaraki · Japan0.3 kmin this dpt
12 intersecting protected areas
Common fishery right area
Okukuji (ibaraki)
IUCN VPrefectural Natural Park
Okukuji (fukushima)
IUCN VPrefectural Natural Park
Omiya
IUCN IVPrefectural Wildlife Protection Area
Tanagura
IUCN IVPrefectural Wildlife Protection Area
Tokai
IUCN IVPrefectural Wildlife Protection Area
Daigochuo
IUCN IVPrefectural Wildlife Protection Area
Yamatsuriyama
IUCN IVPrefectural Wildlife Protection Area
Hanawa
IUCN IVPrefectural Wildlife Protection Area
3 more protected areassorted by area
Fukuroda
IUCN IVPrefectural Wildlife Protection Area
Tateyama(yamatsuri)
IUCN IVPrefectural Wildlife Protection Area
Toyooka
IUCN VPrefectural Nature Conservation Area
1 page = 1 named river (aggregation of 29 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
191 distinct species · 954 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 22 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 久慈川 : 21 espèces reliées par 17 interactions GloBI sur 3 types (connectance 6.7%, filtre Serrano α=0.2). 2 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
138km
Max discharge
34,0m³/s
Max Strahler
4
Segments matched
29
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.