Ontologia

HydroBASINS lev08 watershed · #7080013470

Bassin de San Leandro Creek

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 3 administrative regions : Alameda, Contra Costa, San Francisco

Coastal basin 11% lakePfafstetter: 77430070

Sub-basin area

810,6km²

Upstream area

810,6km²

Discharge

0,39m³/s

Mean elev.

112m

Administrative coverage

3 dept-equivalent regions (GADM L2)

29 intersecting protected areas

20 more protected areas

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

Species present

10 267 distinct species · 3 836 025 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

3 836 025 obs · 20 cellules
Obs. / cellule
≥ 679 982
579 738–679 981
251 091–579 737
121 272–251 090
< 121 272

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

Ecological tissue

Sample of 39 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 San Leandro Creek : 28 espèces reliées par 79 interactions GloBI sur 3 types (connectance 10.7%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
39
Interactions affichées
79
Connectance
0.107
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°

14,4°C

Annual rain

607mm

Moisture idx (CMI)

-0,43

Runoff

231mm/an

PET

1 075mm

AET

505mm

Mean slope

5,7°

Water table

300cm

Forest

31%

Crops

1%

Urban

58%

Protected

1%

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