Rivière· 7 segments
Rio Alegre
Crosses 2 administrative regions : Primeira Cruz, Santo Amaro do Maranhão
Total length
668km
Max discharge
33m³/s
Max Strahler
4
Segments matched
7
River geography2 admin regions · 0 communes
2 administrative regions crossed (GADM L2)
- Santo Amaro do MaranhãoMaranhão · Brazil18.6 kmin this dpt
- Primeira CruzMaranhão · Brazil3.8 kmin this dpt
4 intersecting protected areas
Wetland of International Importance (Ramsar Site)
Environmental Protection Area
Lençóis Maranhenses National Park
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
Park
1 page = 1 named river (aggregation of 7 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
99 distinct species · 229 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Rio Alegre : 29 espèces reliées par 33 interactions GloBI sur 5 types (connectance 5.9%, filtre Serrano α=0.2). 5 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology (HydroRIVERS v10)
Total length
668km
Max discharge
33,0m³/s
Max Strahler
4
Segments matched
7
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.