Ontologia

HydroBASINS lev08 watershed · #1080715730

Bassin de Marigot de Bignona

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 : Bignona, Ziguinchor

Pfafstetter: 14579820

Sub-basin area

744,2km²

Upstream area

744,2km²

Discharge

7,47m³/s

Mean elev.

20m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Casamance31 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

2 dept-equivalent regions (GADM L2)

5 intersecting protected areas

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

Species present

684 distinct species · 1 195 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

1 195 obs · 23 cellules
Obs. / cellule
≥ 416
67–415
46–66
13–45
< 13

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

Ecological tissue

Sample of 28 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 Marigot de Bignona : 25 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 23 interactions GloBI sur 3 types (connectance 6.1%, filtre Serrano α=0.2). 3 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
28
Interactions affichées
23
Connectance
0.061
Patrimoniales
3
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°

26,5°C

Annual rain

1 132mm

Moisture idx (CMI)

-0,41

Runoff

319mm/an

PET

1 908mm

AET

771mm

Mean slope

0,6°

Water table

57cm

Forest

35%

Crops

24%

Urban

3%

Protected

10%

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