Full scientific report: Seychelles
Generated 13 November 2026, 01:08 from live Atlas data
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 |
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 |
Pressure: LAPSSET and villages
Mangrove ha by distance from LAPSSET
Mangrove ha by distance from villages
Data quality
| Dataset | Features | Repaired | Score |
|---|---|---|---|
| Global Mangrove Watch v4.1: mangrove extent 2025, Seychelles | 721 | 0 | 100 |
| Global Mangrove Watch v4.1: mangrove extent 2020, Seychelles | 741 | 0 | 100 |
| Global Mangrove Watch v4.1: mangrove extent 2015, Seychelles | 703 | 0 | 100 |
| Global Mangrove Watch v4.1: mangrove extent 2010, Seychelles | 648 | 0 | 100 |
| Global Mangrove Watch v4.1: mangrove extent 2005, Seychelles | 645 | 0 | 100 |
| Global Mangrove Watch v4.1: mangrove extent 2000, Seychelles | 645 | 0 | 100 |
| Global Mangrove Watch v4.1: mangrove extent 1996, Seychelles | 672 | 0 | 100 |
| polygons | 11 | 0 | 95 |
| Fibre Cable Landing Stations | 126 | 0 | 95 |
| Small airport | 1,979 | 0 | 95 |
| Irrigated Areas | 23,095 | 1 | 95 |
| Seagrass (UNEP-WCMC): Seychelles | 14 | 0 | 90 |
| Community and nature projects (UNDP): Seychelles | 1 | 0 | 90 |
Recommendations
Datasets & sources
| Dataset | Publisher | Features |
|---|---|---|
| Global Mangrove Watch v4.1: mangrove extent 2025, Seychelles | Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) | 721 |
| Global Mangrove Watch v4.1: mangrove extent 2020, Seychelles | Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) | 741 |
| Global Mangrove Watch v4.1: mangrove extent 2015, Seychelles | Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) | 703 |
| Global Mangrove Watch v4.1: mangrove extent 2010, Seychelles | Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) | 648 |
| Global Mangrove Watch v4.1: mangrove extent 2005, Seychelles | Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) | 645 |
| Global Mangrove Watch v4.1: mangrove extent 2000, Seychelles | Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) | 645 |
| Global Mangrove Watch v4.1: mangrove extent 1996, Seychelles | Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) | 672 |
| polygons | WWF Kenya | 11 |
| Fibre Cable Landing Stations | WWF Kenya | 126 |
| Small airport | WWF Kenya | 1,979 |
| Irrigated Areas | WWF Kenya | 23,095 |
| Seagrass (UNEP-WCMC): Seychelles | UN Environment Programme World Conservation Monitoring Centre (UNEP-WCMC) and Short FT | 14 |
| Community and nature projects (UNDP): Seychelles | United Nations Development Programme (UNDP) | 1 |