Grande Brière, marais de Donges et du Brivet
IUCN Not ReportedSpecial Protection Area (Birds Directive) · 2019
198 km²
Commune · FRA
Drefféac
France
CfbTemperate, no dry season, warm summer(100 %)
Species observed
981
Observations
3 880
Area
14,8km²
Ecological tissue
Sample of 40 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 Drefféac : 31 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 90 interactions GloBI sur 5 types (connectance 11.5%, filtre Serrano α=0.2). 9 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Espèces affichées
40
Interactions affichées
90
Connectance
0.115
Patrimoniales
2
Plus dense que (national)0 %(top 100%)
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Species present
981 distinct species · 3 880 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Climate
Mean T°
12,1°C
Annual rain
852mm
Warmest m°
23,0°C
Coldest m°
3,1°C
Elevation: 11 m on average (min 2 m, max 24 m)
Bioclimatic details19 BIO + Köppen full + altitude statsExpert
Annual mean temp.
12,1°C
Annual rain
852mm
Warmest month
23,0°C
Coldest month
3,1°C
Mean alt.
11m
Min
2m
Max
24m
Std. dev.
6m
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
5,9
Org. C
52,8g/kg
Clay
18,5%
Sand
31,7%
Silt
49,8%
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
5,9
Org. C
79,2g/kg
Clay
18,1%
Sand
31,7%
Silt
50,0%
5–15 cm
pH H₂O
5,9
Org. C
46,8g/kg
Clay
18,8%
Sand
31,0%
Silt
50,2%
15–30 cm
pH H₂O
5,9
Org. C
32,3g/kg
Clay
18,7%
Sand
32,2%
Silt
49,2%
SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)
Land cover
Forest19.3%
Crops40.4%
Built-up1.5%
Bare soil0.5%
Other (grassland, water…)38.5%
Copernicus Global Land Cover 100m (Buchhorn et al. 2020)
Hydrology1 basins · 2 lakes · 2 rivers
Hydrology metrics for this exact territory
Stream length here
2,9km
Lake surface here
0,61km²
Basins crossed
1
Max stream order
3
Max drainage
1 138km²
Discharge in basins
0,0m³/s
Mean precip.
814mm/an
Mean T°
11,7°C
Moisture idx
0,04
Max snow
5%
Mean runoff
527mm/an
Mean elev. (basins)
16m
Watersheds crossing here
Lakes (2, top by area)
Rivers / streams (2, ord ≥ 4)
Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10
Human pressure
Pop. density
1hab/km²
Night light
0,0nW
Built-up
146,2%
Pesticides
44,0kg/km²
GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)
Protected areas1
IUCN Not Reported · 1
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.