Ontologia

Commune · TCD

Bol

Chad

BWhArid, desert, hot(100 %)

Species observed

345

Observations

1 523

Area

16 467,9km²

Ecological tissue

Sample of 33 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 Bol : 26 espèces reliées par 30 interactions GloBI sur 3 types (connectance 5.7%, filtre Serrano α=0.2). 7 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
33
Interactions affichées
30
Connectance
0.057
Patrimoniales
0
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Species present

345 distinct species · 1 523 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

1 523 obs · 112 cellules
Obs. / cellule
≥ 119
21–118
10–20
5–9
< 5

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

Climate

Mean T°

28,8°C

Annual rain

274mm

Warmest m°

40,6°C

Coldest m°

14,4°C

Elevation: 284 m on average (min 270 m, max 310 m)

Bioclimatic detailsExpert
Annual mean temp.
28,8°C
Annual rain
274mm
Warmest month
40,6°C
Coldest month
14,4°C
Mean alt.
284m
Min
270m
Max
310m
Std. dev.
7m
Köppen-Geiger (dominant)
BWhArid, desert, hot(100 %)Arid

CHELSA BIO 1-19 v2.1 · ETOPO DEM 60s · Köppen-Geiger 1991-2020 (Beck et al. 2018)

Soil & lithology

pH H₂O

7,4

Org. C

8,9g/kg

Clay

34,7%

Sand

40,1%

Silt

25,2%

Average over 0-30 cm. Per-depth details in expert panel.

Dominant lithology: suGLiMaggregated to Mamdi

3 soil depths detailedExpert
0–5 cm
pH H₂O
7,3
Org. C
11,4g/kg
Clay
32,9%
Sand
41,2%
Silt
25,9%
5–15 cm
pH H₂O
7,4
Org. C
9,1g/kg
Clay
33,1%
Sand
41,0%
Silt
25,9%
15–30 cm
pH H₂O
7,4
Org. C
6,2g/kg
Clay
38,2%
Sand
37,9%
Silt
23,9%

SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)

Land cover

Forest4.4%
Crops18.3%
Built-up0.1%
Bare soil10.4%
Other (grassland, water…)66.9%

Copernicus Global Land Cover 100m (Buchhorn et al. 2020)

Hydrology50 basins · 50 lakes · 1 rivers

Hydrology metrics for this exact territory

Stream length here

1,6km

Lake surface here

9 685,04km²

Basins crossed

50

Max stream order

2

Max drainage

980 212km²

Discharge in basins

1 881,7m³/s

Mean precip.

255mm/an

Mean T°

27,7°C

Moisture idx

-0,88

Mean runoff

9mm/an

Mean elev. (basins)

293m

Watersheds crossing here

41 more basins

Lakes (50, top by area)

41 more lakes

Rivers / streams (1, ord ≥ 4)

Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10

Human pressure

Pop. density

0hab/km²

Night light

0,0nW

Built-up

7,7%

Pesticides

0,0kg/km²

GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)

Protected areas3

IUCN IV · 2IUCN Not Reported · 1📍 Point sites · 1

Lac Tchad

IUCN IV

Wetland of International Importance (Ramsar Site) · 2001

3 386 km²

Lac Tchad

IUCN IV

Wetland of International Importance (Ramsar Site) · 2008

2 153 km²

WDPA (World Database on Protected Areas) — UNEP-WCMC & IUCN