Johanna Jacobs Private Nature Reserve
IUCN Not ReportedNature Reserve · 1955
15 km²
Commune · ZAF
Emfuleni
South Africa
CwbTemperate, dry winter, warm summer(98 %)
Species observed
1 639
Observations
151 299
Area
965,9km²
Ecological tissue
Sample of 22 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 Emfuleni : 19 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 17 interactions GloBI sur 3 types (connectance 7.4%, filtre Serrano α=0.2). 3 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Espèces affichées
22
Interactions affichées
17
Connectance
0.074
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
1 639 distinct species · 151 299 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Climate
Mean T°
16,5°C
Annual rain
657mm
Warmest m°
26,1°C
Coldest m°
2,9°C
Elevation: 1 484 m on average (min 1 422 m, max 1 649 m)
Bioclimatic details19 BIO + Köppen full + altitude statsExpert
Annual mean temp.
16,5°C
Annual rain
657mm
Warmest month
26,1°C
Coldest month
2,9°C
Mean alt.
1 484m
Min
1 422m
Max
1 649m
Std. dev.
36m
Köppen-Geiger (dominant)
CwbTemperate, dry winter, warm summer(98 %)Temperate
CHELSA BIO 1-19 v2.1 · ETOPO DEM 60s · Köppen-Geiger 1991-2020 (Beck et al. 2018)
Soil & lithology
pH H₂O
6,2
Org. C
12,8g/kg
Clay
25,3%
Sand
64,8%
Silt
9,8%
Average over 0-30 cm. Per-depth details in expert panel.
Dominant lithology: ssGLiMaggregated to Sedibeng
3 soil depths detailed0-5cm / 5-15cm / 15-30cm × 5 propsExpert
0–5 cm
pH H₂O
6,2
Org. C
16,1g/kg
Clay
24,8%
Sand
64,9%
Silt
10,3%
5–15 cm
pH H₂O
6,2
Org. C
11,0g/kg
Clay
24,3%
Sand
66,0%
Silt
9,8%
15–30 cm
pH H₂O
6,2
Org. C
11,3g/kg
Clay
26,9%
Sand
63,7%
Silt
9,4%
SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)
Land cover
Forest3.8%
Crops27.4%
Built-up5.4%
Bare soil2.4%
Other (grassland, water…)60.9%
Copernicus Global Land Cover 100m (Buchhorn et al. 2020)
Hydrology10 basins · 7 lakes · 6 rivers
Hydrology metrics for this exact territory
Stream length here
151,5km
Lake surface here
4,16km²
Basins crossed
10
Max stream order
6
Max drainage
49 685km²
Discharge in basins
112,8m³/s
Mean precip.
674mm/an
Mean T°
16,3°C
Moisture idx
-0,55
Mean runoff
24mm/an
Mean elev. (basins)
1 520m
Watersheds crossing here
- Bassin de Rietspruitsub-area1 141 km²overlap577.68 km²60%
- Bassin de Vaal Riversub-area213,9 km²overlap163.16 km²17%
- Bassin de Vaal Riversub-area301,7 km²overlap75.28 km²8%
- Bassin de Klipsub-area2 260,5 km²overlap60.80 km²6%
- Bassin de Vaal Riversub-area2 511,8 km²overlap59.32 km²6%
- Bassin de Suikerbosrand Riversub-area470,5 km²overlap13.05 km²1%
- Bassin de Vaal Riversub-area522,7 km²overlap8.52 km²1%
- Bassin de Loopspruitsub-area1 293,1 km²overlap5.88 km²1%
- Bassin de Vaal Riversub-area3,8 km²overlap2.08 km²0%
1 more basinssorted by overlap
Lakes (7, top by area)
Rivers / streams (6, ord ≥ 4)
Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10
Human pressure
Pop. density
6hab/km²
Night light
5,2nW
Built-up
543,8%
Pesticides
43,7kg/km²
GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)
Protected areas3
IUCN Not Reported · 3
Tweefontein Private Nature Reserve
IUCN Not ReportedNature Reserve · 1995
10 km²
Leeuwkuil Nature Reserve
IUCN Not ReportedNature Reserve · 1962
1 km²
WDPA (World Database on Protected Areas) — UNEP-WCMC & IUCN