Chréa
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve · 2002
412 km²
Province · dza
Médéa
Algeria
CsaTemperate, dry summer, hot summer(64 %)
Species observed
718
Observations
1 859
Area
8 719,2km²
Ecological tissue
Sample of 39 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 Médéa : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 86 interactions GloBI sur 5 types (connectance 11.0%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Espèces affichées
40
Interactions affichées
86
Connectance
0.110
Patrimoniales
1
Plus dense que (national)0 %(top 100%)
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Species present
718 distinct species · 1 859 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Climate
Mean T°
15,8°C
Annual rain
453mm
Warmest m°
34,2°C
Coldest m°
1,7°C
Elevation: 809 m on average (min 318 m, max 1 641 m)
Bioclimatic details19 BIO + Köppen full + altitude statsExpert
Annual mean temp.
15,8°C
Annual rain
453mm
Warmest month
34,2°C
Coldest month
1,7°C
Mean alt.
809m
Min
318m
Max
1 641m
Std. dev.
176m
Köppen-Geiger (dominant)
CsaTemperate, dry summer, hot summer(64 %)Temperate
CHELSA BIO 1-19 v2.1 · ETOPO DEM 60s · Köppen-Geiger 1991-2020 (Beck et al. 2018)
Soil & lithology
pH H₂O
7,2
Org. C
20,3g/kg
Clay
29,2%
Sand
36,2%
Silt
34,5%
Average over 0-30 cm. Per-depth details in expert panel.
3 soil depths detailed0-5cm / 5-15cm / 15-30cm × 5 propsExpert
0–5 cm
pH H₂O
7,1
Org. C
31,9g/kg
Clay
29,1%
Sand
36,3%
Silt
34,7%
5–15 cm
pH H₂O
7,3
Org. C
16,1g/kg
Clay
29,0%
Sand
36,3%
Silt
34,7%
15–30 cm
pH H₂O
7,3
Org. C
12,8g/kg
Clay
29,7%
Sand
36,1%
Silt
34,2%
SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)
Land cover
Forest7.4%
Crops29.0%
Built-up0.4%
Bare soil13.8%
Other (grassland, water…)49.5%
Copernicus Global Land Cover 100m (Buchhorn et al. 2020)
Hydrology34 basins · 11 lakes · 22 rivers
Hydrology metrics for this exact territory
Stream length here
820,0km
Lake surface here
24,87km²
Basins crossed
34
Max stream order
6
Max drainage
23 729km²
Discharge in basins
121,5m³/s
Mean precip.
508mm/an
Mean T°
15,3°C
Moisture idx
-0,55
Max snow
2%
Mean runoff
127mm/an
Mean elev. (basins)
764m
Watersheds crossing here
- Bassin de Chelifsub-area1 702,7 km²overlap1072.26 km²12%
- Bassin de Oued Malahsub-area1 125,3 km²overlap837.26 km²10%
- Bassin de Oued Boukmourisub-area610,4 km²overlap606.22 km²7%
- Bassin de Oued Nahr-Ouasselsub-area680,4 km²overlap539.22 km²6%
- Bassin de Oued Issersub-area524,8 km²overlap524.46 km²6%
- Bassin de Oued Akoumsub-area513,3 km²overlap513.40 km²6%
- Basin #87810sub-area764,8 km²overlap492.78 km²6%
- Bassin de Chelifsub-area511,9 km²overlap469.47 km²5%
- Bassin de Oued Chiffasub-area2 038,6 km²overlap396.71 km²5%
25 more basinssorted by overlap
- Basin #85940sub-area309,9 km²overlap309.95 km²4%
- Basin #88420sub-area745,7 km²overlap295.56 km²3%
- Bassin de Oued Maamorasub-area684,5 km²overlap285.35 km²3%
- Bassin de Oued Nahr-Ouasselsub-area267 km²overlap266.14 km²3%
- Bassin de Oued Issersub-area258,4 km²overlap258.43 km²3%
- Bassin de Oued Nahr-Ouasselsub-area254 km²overlap239.73 km²3%
- Bassin de Oued El Besbessub-area239,7 km²overlap239.71 km²3%
- Bassin de Oued El Harrachsub-area1 098 km²overlap196.78 km²2%
- Basin #89380sub-area421,6 km²overlap156.62 km²2%
- Bassin de Oued Issersub-area278,1 km²overlap122.63 km²1%
- Bassin de Oued Oureksub-area517,9 km²overlap118.13 km²1%
- Bassin de Oued Nahr-Ouasselsub-area736,5 km²overlap113.94 km²1%
- Bassin de Chelifsub-area110,9 km²overlap110.89 km²1%
- Bassin de واد بوسدرايةsub-area1 072,6 km²overlap109.73 km²1%
- Bassin de Oued Issersub-area89 km²overlap88.98 km²1%
- Basin #88600sub-area209,2 km²overlap86.61 km²1%
- Bassin de Oued Derdersub-area832 km²overlap66.97 km²1%
- Basin #88080sub-area72,5 km²overlap60.75 km²1%
- Basin #87850sub-area1 074,8 km²overlap34.51 km²0%
- Bassin de Oued Nahr-Ouasselsub-area279,5 km²overlap34.20 km²0%
- Bassin de Oued Nahr-Ouasselsub-area27,8 km²overlap27.77 km²0%
- Bassin de Oued Soufflatsub-area437,1 km²overlap16.82 km²0%
- Bassin de Oued Keddarasub-area849,7 km²overlap13.57 km²0%
- Bassin de Oued Nahr-Ouasselsub-area10,3 km²overlap10.32 km²0%
- Bassin de Oued Issersub-area870,8 km²overlap3.36 km²0%
Lakes (11, top by area)
- Barrage de Boughezoularea16,3 km²avg depth3.4 m
- Barrage de Ghribarea7,1 km²avg depth39.2 m
- Lake #74376area4 km²avg depth1.9 m
- Lake #74369area1 km²avg depth0.9 m
- Lake #74399area1 km²avg depth1.6 m
- Lac 1371304area1 km²avg depth2.1 m
- Lac 1370648area0,5 km²avg depth20.5 m
- Lac 1371328area0,5 km²avg depth1.5 m
- Lac 1371261area0,4 km²avg depth1.7 m
Rivers / streams (22, ord ≥ 4)
- Oued Nahr-Ouasselord 6len here152.36 km47%total322 km
- Oued Isserord 5len here152.21 km64%total238 km
- Cheliford 6len here144.13 km41%total350 km
- Oued Boukmouriord 3len here57.93 km100%total58 km
- Oued Akoumord 3len here42.19 km100%total42 km
- Oued Chiffaord 3len here38.00 km51%total74 km
- Oued Ourekord 6len here25.94 km43%total60 km
- Oued Bouzahrouord 2len here25.50 km100%total26 km
- Oued Harbilord 2len here23.78 km98%total24 km
- Oued El Besbesord 2len here21.26 km100%total21 km
- Oued Maamoraord 3len here21.04 km86%total24 km
- Oued Malahord 4len here20.67 km100%total21 km
10 more river segmentssorted by Strahler order + length
- Oued Seghouaneord 2len here18.39 km100%total18 km
- Oued Gourord 2len here18.12 km100%total18 km
- Oued El Harrachord 3len here15.19 km14%total109 km
- Oued El-Hadord 2len here13.16 km100%total13 km
- Oued Draissiaord 2len here9.45 km100%total9 km
- Oued Mouzaiaord 1len here8.36 km100%total8 km
- Oued Cheleford 6len here5.86 km25%total24 km
- Oued Deritkaord 3len here3.73 km33%total11 km
- Oued Driktaord 1len here2.50 km100%total3 km
- Oued Soufflatord 3len here0.24 km1%total31 km
Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10
Human pressure
Pop. density
1hab/km²
Night light
1,0nW
Built-up
44,1%
Pesticides
13,6kg/km²
GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)
Protected areas3
IUCN Not Applicable · 1IUCN II · 1IUCN Not Reported · 1
Chréa
IUCN IINational Park · 1983
277 km²
Lac du Barrage de Boughezoul
IUCN Not ReportedWetland of International Importance (Ramsar Site) · 2011
91 km²
WDPA (World Database on Protected Areas) — UNEP-WCMC & IUCN
Sub-administrations64
- Ain BoucifCommune
- Ain OuksirCommune
- AissaouiaCommune
- AzzizCommune
- AzziziaCommune
- BaataCommune
- Ben ChicaoCommune
- Beni SlimaneCommune
- BerrouaghiaCommune
- Bir Ben LaabedCommune
- BouaicheCommune
- BouaichouneCommune
- BoucherahilCommune
- BougharCommune
- BoughezoulCommune
- BouskeneCommune
- ChahbouniaCommune
- Chellalet LadhaouraCommune
- CheniguelCommune
- DerragCommune
- Deux BassinsCommune
- DjouabCommune
- Draa SmarCommune
- El Guelb El KebirCommune
- El HamdaniaCommune
- El Kaf LakhdarCommune
- El OuinetCommune
- El OumariaCommune
- HannachaCommune
- Khams DjouamaaCommune
- Ksar El BoukhariCommune
- MedeaChef-Lieu-Wilaya
- MedjebarCommune
- MeftahaCommune
- MegheraouaCommune
- MezrennaCommune
- MihoubCommune
- OuamriCommune
- Oued HarbilCommune
- OuezraCommune
- Ouled AntarCommune
- Ouled BouachraCommune
- Ouled BrahimCommune
- Ouled DaidCommune
- Ouled HellalCommune
- Ouled MaarafCommune
- Oum El DjellilCommune
- RoubiaCommune
- SanegCommune
- SedrayaCommune
- SeghouaneCommune
- Si El MahdjoubCommune
- Sidi DamedCommune
- Sidi ErrabiaCommune
- Sidi NaamaneCommune
- Sidi ZaharCommune
- Sidi ZianeCommune
- SouaguiCommune
- TablatCommune
- TafraoutCommune
- TamezguidaCommune
- Thleth DouairCommune
- Tizi MahdiCommune
- ZoubiriaCommune