Ontologia

Rivière

山川

Crosses 5 administrative regions : Chikusei, Jōsō, Shimotsuma, Yachiyo, Yūki

rivière

Total length

36km

Max discharge

35m³/s

Max Strahler

4

Segments matched

1

River geography5 admin regions · 0 communes

Parent watershed

hybas-4080583020349 km²

5 administrative regions crossed (GADM L2)

  • Jōsō
    Ibaraki · Japan
    16.3 km
    in this dpt
  • Yachiyo
    Ibaraki · Japan
    7.3 km
    in this dpt
  • Shimotsuma
    Ibaraki · Japan
    4.6 km
    in this dpt
  • Yūki
    Ibaraki · Japan
    4.5 km
    in this dpt
  • Chikusei
    Ibaraki · Japan
    0.0 km
    in this dpt

2 intersecting protected areas

  • Shimotsuma

    IUCN IV

    Prefectural Wildlife Protection Area

  • Notsume

    IUCN V

    Green Space Environment Conservation Area(Ibaraki)

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

Species present

70 distinct species · 104 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 21 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 山川 : 19 espèces reliées par 16 interactions GloBI sur 5 types (connectance 7.6%, filtre Serrano α=0.2). 2 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
21
Interactions affichées
16
Connectance
0.076
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

36km

Max discharge

35,0m³/s

Max Strahler

4

Segments matched

1

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