HydroBASINS lev08 watershed · #6080304900
Bassin de Rio Mearim
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 : Bacabal, São Mateus do Maranhão
Sub-basin area
187,7km²
Upstream area
29 144,5km²
Discharge
197m³/s
Mean elev.
19m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Rio Mearim641 km²
- Bassin de Rio Mearim12 km²
2 dept-equivalent regions (GADM L2)
- 115.2 km²61.6% of basin
- 71.7 km²38.4% of basin
2 intersecting protected areas
Environmental Protection Area
3.53 km² overlap
Wetland of International Importance (Ramsar Site)
3.24 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
50 distinct species · 116 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 9 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 Mearim : 8 espèces reliées par 7 interactions GloBI sur 2 types (connectance 15.6%, filtre Serrano α=0.2). 2 bulles taxonomiques (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°
27,4°C
Annual rain
1 637mm
Moisture idx (CMI)
-0,08
Runoff
545mm/an
PET
1 771mm
AET
1 089mm
Mean slope
0,6°
Water table
17cm
Forest
9%
Crops
11%
Urban
0%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)