Atchafalaya
IUCN IVNational Wildlife Refuge
64 km²
Parish · USA
Saint Martin
United States
CfaTemperate, no dry season, hot summer(100 %)
Species observed
2 533
Observations
218 807
Area
2 119,4km²
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 Saint Martin : 22 espèces reliées par 72 interactions GloBI sur 3 types (connectance 12.8%, filtre Serrano α=0.2). 12 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Espèces affichées
34
Interactions affichées
72
Connectance
0.128
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
2 533 distinct species · 218 807 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Climate
Mean T°
19,9°C
Annual rain
1 781mm
Warmest m°
31,9°C
Coldest m°
7,3°C
Elevation: 3 m on average (min -2 m, max 9 m)
Bioclimatic details19 BIO + Köppen full + altitude statsExpert
Annual mean temp.
19,9°C
Annual rain
1 781mm
Warmest month
31,9°C
Coldest month
7,3°C
Mean alt.
3m
Min
-2m
Max
9m
Std. dev.
2m
Köppen-Geiger (dominant)
CfaTemperate, no dry season, hot summer(100 %)Temperate
CHELSA BIO 1-19 v2.1 · ETOPO DEM 60s · Köppen-Geiger 1991-2020 (Beck et al. 2018)
Soil & lithology
pH H₂O
6,0
Org. C
58,6g/kg
Clay
37,0%
Sand
4,8%
Silt
58,2%
Average over 0-30 cm. Per-depth details in expert panel.
Dominant lithology: suGLiM
3 soil depths detailed0-5cm / 5-15cm / 15-30cm × 5 propsExpert
0–5 cm
pH H₂O
5,9
Org. C
73,4g/kg
Clay
36,4%
Sand
5,0%
Silt
58,7%
5–15 cm
pH H₂O
6,0
Org. C
48,1g/kg
Clay
36,6%
Sand
4,9%
Silt
58,6%
15–30 cm
pH H₂O
6,0
Org. C
54,3g/kg
Clay
38,1%
Sand
4,5%
Silt
57,4%
SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)
Land cover
Forest59.5%
Crops9.3%
Built-up0.6%
Bare soil0.3%
Other (grassland, water…)30.4%
Copernicus Global Land Cover 100m (Buchhorn et al. 2020)
Hydrology13 basins · 35 lakes · 38 rivers
Hydrology metrics for this exact territory
Stream length here
323,4km
Lake surface here
77,95km²
Basins crossed
13
Max stream order
5
Max drainage
5 038km²
Discharge in basins
161,5m³/s
Mean precip.
1 530mm/an
Mean T°
19,5°C
Moisture idx
0,09
Mean runoff
741mm/an
Mean elev. (basins)
10m
Watersheds crossing here
- Bassin de Grand Bayousub-area1 885 km²overlap607.43 km²29%
- Bassin de Bayou Techesub-area2 204,7 km²overlap501.62 km²24%
- Bassin de Chicot Passsub-area499,5 km²overlap289.85 km²14%
- Bassin de Bayou Grosse Tetesub-area2 305,3 km²overlap182.54 km²9%
- Bassin de Atchafalaya Basin Main Channelsub-area173,6 km²overlap173.37 km²8%
- Bassin de Atchafalaya Basin Main Channelsub-area332,6 km²overlap167.00 km²8%
- Bassin de Atchafalaya Riversub-area139,6 km²overlap100.59 km²5%
- Bassin de Bayou Schaffersub-area624,2 km²overlap65.96 km²3%
- Bassin de Delcambre Canalsub-area399,6 km²overlap14.42 km²1%
Lakes (35, top by area)
- Bird Island Chutearea62,9 km²avg depth4.0 m
- Lake Verretarea56,8 km²avg depth3.3 m
- Lake Palourdearea41,9 km²avg depth4.8 m
- Lake Bigeuxarea16,9 km²avg depth1.6 m
- Flat Lakearea9,6 km²avg depth2.3 m
- Spanish Lakearea4,8 km²avg depth4.4 m
- Grand Lakearea4,5 km²avg depth0.7 m
- Grassy Lakearea4,3 km²avg depth3.4 m
- Cow Island Lakearea3,1 km²avg depth4.7 m
26 more lakes
- Lake #14037area3 km²avg depth1.6 m
- Lake #13890area1,3 km²avg depth2.6 m
- Lake la Pointearea1,1 km²avg depth2.6 m
- Duck Lakearea1,1 km²avg depth1.3 m
- Lac 1065873area0,9 km²avg depth2.8 m
- Lac 1065888area0,8 km²avg depth2.8 m
- Lac 1065729area0,8 km²avg depth2.6 m
- Lac 1066449area0,6 km²avg depth1.9 m
- Lac 1066469area0,6 km²avg depth2.1 m
- Lac 1065739area0,6 km²avg depth2.3 m
- Lac 1065926area0,6 km²avg depth1.9 m
- Lac 1065854area0,5 km²avg depth1.3 m
- Lac 1066235area0,5 km²avg depth1.9 m
- Lac 1065764area0,4 km²avg depth2.6 m
- Lac 1065978area0,4 km²avg depth2.0 m
- Lac 1065876area0,4 km²avg depth2.9 m
- Lac 1065774area0,3 km²avg depth3.0 m
- Lac 1065869area0,2 km²avg depth1.8 m
- Lac 1065960area0,2 km²avg depth1.5 m
- Lac 1066188area0,2 km²avg depth1.8 m
- Lac 1065771area0,2 km²avg depth2.1 m
- Lac 1065884area0,2 km²avg depth1.9 m
- Lac 1065969area0,2 km²avg depth1.4 m
- Lac 1066311area0,2 km²avg depth1.8 m
- Lac 1065975area0,1 km²avg depth2.2 m
- Lac 1065949area0,1 km²avg depth1.6 m
Rivers / streams (38, ord ≥ 4)
- Atchafalaya Basin Main Channelord 5len here43.72 km64%total69 km
- Intracoastal Waterway Alternate Routeord 5len here39.38 km48%total81 km
- Bayou Techeord 4len here30.56 km18%total174 km
- Atchafalaya Riverord 4len here26.70 km14%total188 km
- Bayou La Roseord 1len here13.97 km100%total14 km
- Whisky Bay Pilot Channelord 4len here13.94 km57%total25 km
- Bayou La Rompeord 2len here13.34 km100%total13 km
- Bayou L'Embarrasord 2len here13.03 km100%total13 km
- Grand Bayouord 4len here12.73 km29%total45 km
- Chicot Passord 4len here10.82 km36%total30 km
- Coulee du Portageord 2len here9.81 km73%total14 km
- Bayou Longord 1len here7.68 km100%total8 km
26 more river segmentssorted by Strahler order + length
- Blind Tensas Cutord 4len here7.63 km75%total10 km
- Tarleton Bayouord 4len here6.98 km100%total7 km
- Vermilion Riverord 3len here5.20 km18%total29 km
- Butte La Rose Bayord 1len here5.01 km100%total5 km
- Old Riverord 3len here5.00 km63%total8 km
- Splice Island Chuteord 4len here4.69 km100%total5 km
- Coulee Portageord 1len here4.57 km100%total5 km
- Coulee Nicole Guidryord 1len here4.35 km100%total4 km
- Lake Mongouloisord 4len here4.29 km100%total4 km
- Little Alabama Bayouord 1len here4.03 km100%total4 km
- Persimmon Passord 3len here3.84 km100%total4 km
- Lake Longord 1len here3.76 km100%total4 km
- Lake Chicotord 4len here3.39 km75%total5 km
- Grand Canalord 1len here3.06 km100%total3 km
- Tensas Bayord 1len here2.94 km100%total3 km
- Bayou Milhommeord 1len here2.85 km100%total3 km
- Bayou Veillonord 1len here2.69 km100%total3 km
- Bayou Manuelord 1len here2.60 km100%total3 km
- Upper Grand Riverord 3len here2.51 km11%total22 km
- Bayou Boeuford 4len here2.04 km2%total118 km
- Evangiline Canalord 4len here2.00 km100%total2 km
- Bayou Chene Cutord 1len here1.71 km100%total2 km
- Belle Riverord 1len here0.92 km67%total1 km
- Alabama Bayouord 1len here0.92 km43%total2 km
- Bayou Carencroord 2len here0.47 km2%total19 km
- Big Island Chuteord 2len here0.26 km1%total24 km
Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10
Human pressure
Pop. density
0hab/km²
Night light
1,4nW
Built-up
58,1%
Pesticides
12,6kg/km²
GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)
Protected areas7
IUCN V · 6IUCN IV · 1
Cypress Island
IUCN VPrivate Conservation Land · 1994
36 km²
Lake Fausse Pointe
IUCN VState Park · 1987
23 km²
Atchafalaya River Basin Swamp Megasite Fee
IUCN VPrivate Conservation Land · 2015
22 km²
Wetlands Reserve Program (WRP), St. Martin, LA
IUCN VReserve Program · 2011
0 km²
Teche & Fuselier Bayou Fee
IUCN VPrivate Conservation Land · 1990
0 km²
Complete list7 protected areas
- AtchafalayaNational Wildlife RefugeIUCN IV64 km²
- Cypress IslandPrivate Conservation LandIUCN V199436 km²
- Lake Fausse PointeState ParkIUCN V198723 km²
- Atchafalaya River Basin Swamp Megasite FeePrivate Conservation LandIUCN V201522 km²
- Wetlands Reserve Program (WRP), St. Martin, LAReserve ProgramIUCN V20110 km²
- Teche & Fuselier Bayou FeePrivate Conservation LandIUCN V19900 km²
- Cypress Island FeePrivate Conservation LandIUCN V20070 km²
WDPA (World Database on Protected Areas) — UNEP-WCMC & IUCN