Ontologia

Commune · TCD

Marfa

Chad

BShArid, steppe, hot(100 %)

Species observed

115

Observations

282

Area

2 993km²

Ecological tissue

Sample of 6 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 Marfa : 5 espèces reliées par 6 interactions GloBI sur 1 type (connectance 28.6%, filtre Serrano α=0.2). 2 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
7
Interactions affichées
6
Connectance
0.286
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

115 distinct species · 282 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

282 obs · 18 cellules
Obs. / cellule
≥ 64
34–63
30–33
4–29
< 4

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

Climate

Mean T°

27,9°C

Annual rain

486mm

Warmest m°

39,5°C

Coldest m°

16,5°C

Elevation: 551 m on average (min 457 m, max 698 m)

Bioclimatic detailsExpert
Annual mean temp.
27,9°C
Annual rain
486mm
Warmest month
39,5°C
Coldest month
16,5°C
Mean alt.
551m
Min
457m
Max
698m
Std. dev.
38m
Köppen-Geiger (dominant)
BShArid, steppe, hot(100 %)Arid

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

Soil & lithology

pH H₂O

7,0

Org. C

7,3g/kg

Clay

28,0%

Sand

43,0%

Silt

29,1%

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

Dominant lithology: suGLiMaggregated to Ouara

3 soil depths detailedExpert
0–5 cm
pH H₂O
7,0
Org. C
7,7g/kg
Clay
26,2%
Sand
44,7%
Silt
29,1%
5–15 cm
pH H₂O
7,0
Org. C
7,3g/kg
Clay
27,1%
Sand
43,4%
Silt
29,4%
15–30 cm
pH H₂O
7,1
Org. C
6,9g/kg
Clay
30,5%
Sand
40,7%
Silt
28,7%

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

Land cover

Forest5.2%
Crops14.9%
Built-up0.0%
Bare soil1.7%
Other (grassland, water…)78.3%

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

Hydrology15 basins · 0 lakes · 2 rivers

Hydrology metrics for this exact territory

Stream length here

66,6km

Basins crossed

15

Max stream order

4

Max drainage

9 032km²

Discharge in basins

6,1m³/s

Mean precip.

489mm/an

Mean T°

28,4°C

Moisture idx

-0,78

Mean runoff

26mm/an

Mean elev. (basins)

544m

Watersheds crossing here

6 more basins

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

Human pressure

Pop. density

0hab/km²

Built-up

0,9%

Pesticides

0,1kg/km²

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