Ontologia

HydroBASINS lev08 watershed · #7080392390

Bassin de Grass Valley Canyon

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 : Gilliam, Sherman

Pfafstetter: 78250210

Sub-basin area

754,5km²

Upstream area

20 521,3km²

Discharge

80,4m³/s

Mean elev.

515m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Columbia River431 km²

▲ Receives from 2 basins

2 dept-equivalent regions (GADM L2)

1 intersecting protected areas

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

Species present

891 distinct species · 15 702 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

15 702 obs · 23 cellules
Obs. / cellule
≥ 3 924
1 759–3 923
816–1 758
349–815
< 349

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

Ecological tissue

Sample of 36 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 Grass Valley Canyon : 23 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 127 interactions GloBI sur 4 types (connectance 18.1%, filtre Serrano α=0.2). 15 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
38
Interactions affichées
127
Connectance
0.181
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°

9,9°C

Annual rain

291mm

Moisture idx (CMI)

-0,72

Runoff

103mm/an

PET

1 042mm

AET

253mm

Mean slope

4,2°

Water table

626cm

Forest

1%

Crops

71%

Urban

0%

Protected

3%

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