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ATLAS REPORT

Mangrove ecosystem report: Madagascar

Generated 15 October 2026, 08:22 from live Atlas data

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Executive summary

Atlas holds 319,264 mapped features and 38,648 observations in 44 datasets. The mapped mangrove canopy covers 261,598 ha in 26,508 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.172 ha, while patches of 10 ha or more hold 93.6% 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)
Mangrove26,508261,598.3100.0%9.87
Shannon evenness by area: 0.00

Fragmentation & landscape metrics

Patches
26,508
Mean / median / largest
9.87 / 0.172 / 4,899.5 ha
Effective mesh size
956.6 ha
Largest patch index
1.9%
Power-law exponent α
1.54

Spatial clustering

Global Moran’s I = 0.141 (z = 6.5, p < 0.001). Hot-spot cells (Gi*, ≥95%): 78; cold-spot cells: 31.

Top hot-spot cellPolygonsArea (ha)Gi* z
-15.55, 471268114.24
-15.6, 47961,3784.20
-15.6, 46.95458723.84
-15.65, 471758983.80
-15.65, 46.9566283.71
-15.55, 47.05667863.48

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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