Ontologia

Ruisseau· 5 segments

山田川

Crosses 2 administrative regions : Hitachiōta, Naka

ruisseau

Total length

617km

Max discharge

3,2m³/s

Max Strahler

3

Segments matched

5

River geography2 admin regions · 0 communes

Parent watershed

hybas-40800444901481 km²

2 administrative regions crossed (GADM L2)

  • Hitachiōta
    Ibaraki · Japan
    30.2 km
    in this dpt
  • Naka
    Ibaraki · Japan
    0.3 km
    in this dpt

5 intersecting protected areas

1 page = 1 named river (aggregation of 5 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

138 distinct species · 347 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 7 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 山田川 : 6 espèces reliées par 5 interactions GloBI sur 2 types (connectance 23.8%, filtre Serrano α=0.2). 1 bulle taxonomique (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
7
Interactions affichées
5
Connectance
0.238
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

617km

Max discharge

3,2m³/s

Max Strahler

3

Segments matched

5

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