Ontologia

HydroBASINS lev08 watershed · #4080044540

Bassin de 利根川

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 6 administrative regions : Asahi, Chōshi, Kamisu, Katori, Tōnoshō +1

6% lakePfafstetter: 41301610

Sub-basin area

183,2km²

Upstream area

15 912,7km²

Discharge

244,64m³/s

Mean elev.

20m

Administrative coverage

Hydrographic chain

▼ Drains into

Outlet (drains to ocean / endorheic)

▲ Receives from 2 basins

6 dept-equivalent regions (GADM L2)

7 intersecting protected areas

  • Suigo-Tsukuba

    IUCN V

    Quasi National Park

    24.58 km² overlap

  • Yamada machi

    IUCN IV

    Prefectural Wildlife Protection Area

    7.15 km² overlap

  • Hasakiminami

    IUCN IV

    Prefectural Wildlife Protection Area

    6.92 km² overlap

  • Shiraishi

    IUCN IV

    Prefectural Wildlife Protection Area

    0.51 km² overlap

  • Takisato

    IUCN IV

    Prefectural Wildlife Protection Area

    0.05 km² overlap

  • Kujukuri

    IUCN V

    Prefectural Natural Park

    0.03 km² overlap

  • Saruta jinja no mori

    IUCN V

    Local Environment Conservation Area(Chiba)

    0.02 km² overlap

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

Species present

654 distinct species · 10 171 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

10 171 obs · 5 cellules
Obs. / cellule
≥ 4 179
4 179–4 178
2 715–4 178
2 089–2 714
< 2 089

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

Ecological tissue

Sample of 24 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 利根川 : 18 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 60 interactions GloBI sur 2 types (connectance 14.8%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
29
Interactions affichées
60
Connectance
0.148
Patrimoniales
1
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°

14,8°C

Annual rain

1 552mm

Moisture idx (CMI)

0,43

Runoff

789mm/an

PET

884mm

AET

874mm

Mean slope

1,3°

Water table

47cm

Forest

7%

Crops

51%

Urban

51%

Protected

21%

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