Marais de l'Erdre
IUCN Not ReportedSpecial Protection Area (Birds Directive) · 2019
28 km²
Commune · FRA
Petit-Mars
France
CfbTemperate, no dry season, warm summer(100 %)
Species observed
2 149
Observations
15 740
Area
25,6km²
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).
RègnesAnimalPlanteChampignonBacterie
RelationsPredationParasitismeSymbiosePollinisation
StatutEn dangerVulnérableProtégéeEndémique
Indicateurs du tissu écologique
Tissu écologique de Petit-Mars : 23 espèces reliées par 118 interactions GloBI sur 5 types (connectance 19.8%, filtre Serrano α=0.2). 12 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Espèces affichées
35
Interactions affichées
118
Connectance
0.198
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
2 149 distinct species · 15 740 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Climate
Mean T°
12,0°C
Annual rain
789mm
Warmest m°
23,6°C
Coldest m°
2,6°C
Elevation: 15 m on average (min 3 m, max 39 m)
Bioclimatic details19 BIO + Köppen full + altitude statsExpert
Annual mean temp.
12,0°C
Annual rain
789mm
Warmest month
23,6°C
Coldest month
2,6°C
Mean alt.
15m
Min
3m
Max
39m
Std. dev.
8m
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
6,1
Org. C
39,2g/kg
Clay
17,1%
Sand
33,2%
Silt
49,7%
Average over 0-30 cm. Per-depth details in expert panel.
Dominant lithology: ssGLiMaggregated to Loire-Atlantique
3 soil depths detailed0-5cm / 5-15cm / 15-30cm × 5 propsExpert
0–5 cm
pH H₂O
6,1
Org. C
64,6g/kg
Clay
15,7%
Sand
34,4%
Silt
49,9%
5–15 cm
pH H₂O
6,1
Org. C
27,4g/kg
Clay
17,5%
Sand
33,0%
Silt
49,5%
15–30 cm
pH H₂O
6,1
Org. C
25,6g/kg
Clay
18,1%
Sand
32,2%
Silt
49,7%
SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)
Land cover
Forest15.4%
Crops49.2%
Built-up1.8%
Bare soil0.9%
Other (grassland, water…)32.8%
Copernicus Global Land Cover 100m (Buchhorn et al. 2020)
Hydrology1 basins · 2 lakes · 7 rivers
Hydrology metrics for this exact territory
Stream length here
14,2km
Lake surface here
1,19km²
Basins crossed
1
Max stream order
3
Max drainage
1 019km²
Discharge in basins
0,3m³/s
Mean precip.
751mm/an
Mean T°
11,4°C
Moisture idx
-0,09
Max snow
5%
Mean runoff
437mm/an
Mean elev. (basins)
44m
Watersheds crossing here
Lakes (2, top by area)
Rivers / streams (7, ord ≥ 4)
- Ruisseau du Tertre Rougeord 1len here5.49 km80%total7 km
- Ruisseau de la Marquerieord 1len here3.85 km52%total7 km
- Ruisseau de la Guinelièreord 2len here1.85 km93%total2 km
- L'Erdreord 3len here1.47 km2%total65 km
- Ruisseau du Rateauord 1len here0.91 km21%total4 km
- Douve des Bonnes Fillesord 3len here0.36 km14%total3 km
- Ruisseau de Montagnéord 1len here0.22 km1%total15 km
Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10
Human pressure
Pop. density
1hab/km²
Night light
0,6nW
Built-up
181,1%
Pesticides
43,6kg/km²
GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)
Protected areas2
IUCN Not Reported · 2
Marais de l'Erdre
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive) · 2014
26 km²
WDPA (World Database on Protected Areas) — UNEP-WCMC & IUCN
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.