Ontologia

Commune · FRA

Houdan

France

CfbTemperate, no dry season, warm summer(100 %)

Species observed

1 843

Observations

31 339

Area

10,4km²

Ecological tissue

Sample of 31 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 Houdan : 25 espèces reliées par 85 interactions GloBI sur 6 types (connectance 18.3%, filtre Serrano α=0.2). 6 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
31
Interactions affichées
85
Connectance
0.183
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

1 843 distinct species · 31 339 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

31 339 obs · 3 cellules
Obs. / cellule
≥ 12 084
12 084–12 083
12 084–12 083
10 990–12 083
< 10 990

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

Climate

Mean T°

10,9°C

Annual rain

658mm

Warmest m°

23,1°C

Coldest m°

1,1°C

Elevation: 112 m on average (min 101 m, max 126 m)

Bioclimatic detailsExpert
Annual mean temp.
10,9°C
Annual rain
658mm
Warmest month
23,1°C
Coldest month
1,1°C
Mean alt.
112m
Min
101m
Max
126m
Std. dev.
7m
Köppen-Geiger (dominant)
CfbTemperate, no dry season, warm summer(100 %)Temperate

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

Soil & lithology

pH H₂O

6,9

Org. C

22,6g/kg

Clay

24,7%

Sand

19,1%

Silt

56,2%

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

Dominant lithology: scGLiMaggregated to Yvelines

3 soil depths detailedExpert
0–5 cm
pH H₂O
6,8
Org. C
37,6g/kg
Clay
23,3%
Sand
18,9%
Silt
57,8%
5–15 cm
pH H₂O
7,0
Org. C
16,6g/kg
Clay
24,7%
Sand
18,3%
Silt
57,0%
15–30 cm
pH H₂O
7,0
Org. C
13,5g/kg
Clay
26,0%
Sand
20,1%
Silt
53,9%

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

Land cover

Forest2.1%
Crops74.8%
Built-up2.7%
Bare soil0.1%
Other (grassland, water…)20.3%

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

Hydrology1 basins · 0 lakes · 3 rivers

Hydrology metrics for this exact territory

Stream length here

5,6km

Basins crossed

1

Max stream order

2

Max drainage

4 550km²

Discharge in basins

0,4m³/s

Mean precip.

626mm/an

Mean T°

10,2°C

Moisture idx

-0,20

Max snow

7%

Mean runoff

324mm/an

Mean elev. (basins)

123m

Watersheds crossing here

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

Human pressure

Pop. density

2hab/km²

Night light

2,2nW

Built-up

270,4%

Pesticides

45,6kg/km²

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

France-specific data (Phase 2)

ZNIEFF, Natura 2000, INPN protected spaces, BNV-D pesticides, Naïades water quality, SAFRAN fine climate, BRGM lithology — Layer FR to load in Phase 2.