HydroBASINS lev08 watershed · #6080350570
Bassin de Rio da Onça
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 : Castelo do Piauí, São João da Serra, São Miguel do Tapuio
Sub-basin area
1 339,9km²
Upstream area
1 339,9km²
Discharge
4,51m³/s
Mean elev.
246m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 658.8 km²49.4% of basin
- 531.4 km²39.8% of basin
- 143.9 km²10.8% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
106 distinct species · 143 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 7 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).
Indicateurs du tissu écologique
Tissu écologique de Bassin de Rio da Onça : 6 espèces reliées par 6 interactions GloBI sur 3 types (connectance 28.6%, filtre Serrano α=0.2). 1 bulle taxonomique (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
26,0°C
Annual rain
984mm
Moisture idx (CMI)
-0,46
Runoff
106mm/an
PET
1 825mm
AET
816mm
Mean slope
1,9°
Water table
175cm
Forest
17%
Crops
4%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)