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ATLAS REPORT

Mangrove ecosystem report: Seychelles

Generated 15 October 2026, 04:51 from live Atlas data

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Executive summary

Atlas holds 30,001 mapped features and 23,095 observations in 13 datasets. The mapped mangrove canopy covers 1,650 ha in 741 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.176 ha, while patches of 10 ha or more hold 71.5% 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)
Mangrove7411,650.2100.0%2.23
Shannon evenness by area: 0.00

Fragmentation & landscape metrics

Patches
741
Mean / median / largest
2.23 / 0.176 / 256.9 ha
Effective mesh size
106.7 ha
Largest patch index
15.6%
Power-law exponent α
1.77

Spatial clustering

Global Moran’s I = 0.512 (z = 4.6, p < 0.001). Hot-spot cells (Gi*, ≥95%): 8; cold-spot cells: 0.

Top hot-spot cellPolygonsArea (ha)Gi* z
-9.4, 46.439433.30
-9.45, 46.4562892.73
-9.45, 46.45602582.71
-9.4, 46.4531352.71
-9.45, 46.264972.64
-9.45, 46.254242.56

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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