Ontologia

HydroBASINS lev08 watershed · #7080526910

Bassin de Van Duzen River

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 2 administrative regions : Humboldt, Trinity

Pfafstetter: 77460020

Sub-basin area

1 106,6km²

Upstream area

1 106,7km²

Discharge

39,96m³/s

Mean elev.

721m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Eel River158 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

2 dept-equivalent regions (GADM L2)

7 intersecting protected areas

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

Species present

2 456 distinct species · 43 972 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

43 972 obs · 31 cellules
Obs. / cellule
≥ 9 266
3 257–9 265
1 293–3 256
833–1 292
< 833

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

Ecological tissue

Sample of 45 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 Van Duzen River : 29 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 143 interactions GloBI sur 4 types (connectance 13.8%, filtre Serrano α=0.2). 17 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
46
Interactions affichées
143
Connectance
0.138
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°

10,2°C

Annual rain

1 558mm

Moisture idx (CMI)

0,32

Runoff

1 131mm/an

PET

1 056mm

AET

650mm

Mean slope

13,5°

Water table

487cm

Forest

94%

Crops

2%

Urban

0%

Protected

5%

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