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ATLAS REPORT

Mangrove ecosystem report: Guinea-Bissau

Generated 15 October 2026, 12:06 from live Atlas data

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Executive summary

Atlas holds 231,506 mapped features and 37,971 observations in 23 datasets. The mapped mangrove canopy covers 297,120 ha in 12,944 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.175 ha, while patches of 10 ha or more hold 97.4% 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

FormationPolygonsArea (ha)ShareMean patch (ha)
Mangrove12,944297,120.3100.0%22.95
Shannon evenness by area: 0.00

Fragmentation & landscape metrics

Patches
12,944
Mean / median / largest
22.95 / 0.175 / 7,079.5 ha
Effective mesh size
2,179.4 ha
Largest patch index
2.4%
Power-law exponent α
1.46

Spatial clustering

Global Moran’s I = 0.152 (z = 6.7, p < 0.001). Hot-spot cells (Gi*, ≥95%): 67; cold-spot cells: 36.

Top hot-spot cellPolygonsArea (ha)Gi* z
11.95, -15.9551,7243.47
12, -15.95156983.42
11.2, -15.25628633.29
11.85, -16.0537573.27
11.95, -15.75131,2233.16
11.1, -16.05127653.13

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.
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