Ontologia

Rivière· 9 segments

烏川

Crosses 7 administrative regions : Annaka, Fujioka, Honjō, Isesaki, Kamisato +2

rivière

Total length

151km

Max discharge

83,4m³/s

Max Strahler

5

Segments matched

9

River geography7 admin regions · 0 communes

Parent watershed

hybas-40805737501784 km²

7 administrative regions crossed (GADM L2)

  • Takasaki
    Gunma · Japan
    25.6 km
    in this dpt
  • Tamamura
    Gunma · Japan
    1.6 km
    in this dpt
  • Fujioka
    Gunma · Japan
    1.1 km
    in this dpt
  • Kamisato
    Saitama · Japan
    0.7 km
    in this dpt
  • Isesaki
    Gunma · Japan
    0.6 km
    in this dpt
  • Honjō
    Saitama · Japan
    0.2 km
    in this dpt
  • Annaka
    Gunma · Japan
    0.0 km
    in this dpt

3 intersecting protected areas

  • Hanamagariyama

    IUCN IV

    Prefectural Wildlife Protection Area

  • Kannnonyama

    IUCN IV

    Prefectural Wildlife Protection Area

  • Iwahana

    IUCN IV

    Prefectural Wildlife Protection Area

1 page = 1 named river (aggregation of 9 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

156 distinct species · 252 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 35 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 烏川 : 31 espèces reliées par 33 interactions GloBI sur 4 types (connectance 5.5%, filtre Serrano α=0.2). 4 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
35
Interactions affichées
33
Connectance
0.056
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

151km

Max discharge

83,4m³/s

Max Strahler

5

Segments matched

9

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