Ontologia

HydroBASINS lev08 watershed · #4080562480

Bassin de 荒川

A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.

Crosses 9 administrative regions : Ichikai, Motegi, Nasukarasuyama, Nasushiobara, Nikkō +4

Pfafstetter: 41301584

Sub-basin area

357,7km²

Upstream area

357,8km²

Discharge

7,85m³/s

Mean elev.

352m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de 那珂川804 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

9 dept-equivalent regions (GADM L2)

1 more

23 intersecting protected areas

14 more protected areas

  • Ohirazaki koen

    IUCN IV

    Prefectural Wildlife Protection Area

    0.64 km² overlap

  • NISHIMATSU Shioya symbiotic forest

    IUCN Not Applicable

    OECM

    0.35 km² overlap

  • Iioka

    IUCN IV

    Prefectural Wildlife Protection Area

    0.29 km² overlap

  • Kitsuregawa

    IUCN IV

    Prefectural Wildlife Protection Area

    0.26 km² overlap

  • Kotohirayama

    IUCN IV

    Prefectural Wildlife Protection Area

    0.18 km² overlap

  • Kawasaki joseki koen

    IUCN IV

    Prefectural Wildlife Protection Area

    0.15 km² overlap

  • Tokogaoka

    IUCN IV

    Prefectural Wildlife Protection Area

    0.13 km² overlap

  • Terayama kannonji

    IUCN IV

    Prefectural Wildlife Protection Area

    0.09 km² overlap

  • Kobana

    IUCN V

    Prefectural Nature Conservation Area

    0.07 km² overlap

  • Terayama

    IUCN V

    Green Space Environment Conservation Area(Tochigi)

    0.06 km² overlap

  • Kibata

    IUCN IV

    Prefectural Wildlife Protection Area

    0.05 km² overlap

  • Kibata

    IUCN V

    Green Space Environment Conservation Area(Tochigi)

    0.03 km² overlap

  • Kitsuregawa

    IUCN V

    Green Space Environment Conservation Area(Tochigi)

    0.03 km² overlap

  • Minami takahara

    IUCN V

    Prefectural Nature Conservation Area

    0.02 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

590 distinct species · 2 318 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

2 318 obs · 9 cellules
Obs. / cellule
≥ 1 236
1 236–1 235
172–1 235
150–171
< 150

Source : GBIF — observations agrégées par hexagones 0.027° × 0.027° (~22km), filtre précision coordonnée < 10 km. Fond carte : OpenFreeMap · © OpenStreetMap.

Ecological tissue

Sample of 29 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 Bassin de 荒川 : 25 espèces reliées par 40 interactions GloBI sur 5 types (connectance 9.2%, filtre Serrano α=0.2). 5 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
30
Interactions affichées
40
Connectance
0.092
Patrimoniales
0
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

11,7°C

Annual rain

1 556mm

Moisture idx (CMI)

0,37

Runoff

695mm/an

PET

971mm

AET

962mm

Mean slope

6,3°

Water table

178cm

Forest

36%

Crops

47%

Urban

11%

Protected

15%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)