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ATLAS REPORT
Mangrove ecosystem report: Nigeria
Generated 15 October 2026, 09:20 from live Atlas data
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Executive summary
Atlas holds 638,249 mapped features and 38,022 observations in 29 datasets. The mapped mangrove canopy covers 822,120 ha in 46,453 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.089 ha, while patches of 10 ha or more hold 97.7% of the area. 0 ha (0.0%) lies within 10 km of the LAPSSET development footprint.
Single mapping epoch (2019). Areas are geodesic hectares recalculated from geometry.
Species & formations
| Formation | Polygons | Area (ha) | Share | Mean patch (ha) |
|---|---|---|---|---|
| Mangrove | 46,453 | 822,120.2 | 100.0% | 17.70 |
Shannon evenness by area: 0.00
Fragmentation & landscape metrics
- Patches
- 46,453
- Mean / median / largest
- 17.70 / 0.089 / 36,185.5 ha
- Effective mesh size
- 8,706.2 ha
- Largest patch index
- 4.4%
- Power-law exponent α
- 1.52
Spatial clustering
Global Moran’s I = 0.224 (z = 11.1, p < 0.001). Hot-spot cells (Gi*, ≥95%): 98; cold-spot cells: 58.
| Top hot-spot cell | Polygons | Area (ha) | Gi* z |
|---|---|---|---|
| 4.45, 6.15 | 76 | 1,080 | 3.26 |
| 4.5, 6.25 | 2 | 4,712 | 3.21 |
| 4.45, 6.05 | 293 | 410 | 3.11 |
| 5.6, 5.45 | 152 | 889 | 3.09 |
| 4.45, 6.1 | 49 | 2,037 | 3.07 |
| 4.7, 6.85 | 140 | 1,028 | 3.07 |
Methods & limits
Areas and lengths are recomputed on the WGS 84 ellipsoid; units are harmonised (ha, m, %, UTC). The mapping is a single 2019 epoch; the source publishes no licence; field plots are a sample; scenario figures are illustrative assumptions. Cite the original publishers listed above. Full methods: Methodologies page.