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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
| Formation | Polygons | Area (ha) | Share | Mean patch (ha) |
|---|---|---|---|---|
| Mangrove | 741 | 1,650.2 | 100.0% | 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 cell | Polygons | Area (ha) | Gi* z |
|---|---|---|---|
| -9.4, 46.4 | 39 | 43 | 3.30 |
| -9.45, 46.4 | 56 | 289 | 2.73 |
| -9.45, 46.45 | 60 | 258 | 2.71 |
| -9.4, 46.45 | 31 | 35 | 2.71 |
| -9.45, 46.2 | 64 | 97 | 2.64 |
| -9.45, 46.25 | 4 | 24 | 2.56 |
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.