Rivière· 15 segments
穴内川
Crosses 4 administrative regions : Kami, Nankoku, Tosa, Ōtoyo
Total length
47km
Max discharge
43,6m³/s
Max Strahler
4
Segments matched
15
River geography4 admin regions · 0 communes
4 administrative regions crossed (GADM L2)
4 intersecting protected areas
Ryugado
IUCN VPrefectural Natural Park
Kajinomori
IUCN VPrefectural Natural Park
Hokigamine
IUCN IVPrefectural Wildlife Protection Area
Ananaigawa dam
IUCN IVPrefectural Wildlife Protection Area
1 page = 1 named river (aggregation of 15 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
262 distinct species · 376 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).
Indicateurs du tissu écologique
Tissu écologique de 穴内川 : 19 espèces reliées par 16 interactions GloBI sur 2 types (connectance 7.6%, 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
47km
Max discharge
43,6m³/s
Max Strahler
4
Segments matched
15
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.