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Spatial Data & Mapping Resources

Species Richness and Range Rarity Data

 

Species Richness and Range-Size Rarity rasters

The rasters available on this page are based on the raw IUCN ranges (version 2017-3) for amphibians, birds and mammals. As the species ranges have not been refined by altitude and landcover (i.e. Area of Habitat, AOH), there may be a fair amount of unsuitable habitat in the raw ranges, resulting in errors of commission.

 

The data is biased towards vertebrates as these are currently the terrestrial taxonomic groups that have been comprehensively assessed and for which we have polygon maps. The analyses are only relevant for terrestrial areas, as marine areas will only be represented by birds and mammals.

 

The raster resolution is about 5 km at the equator.

More details on IUCN Red List species selection and processing.

 

Species Richness

The raw IUCN ranges have been rasterised and summed across all species to show the number of species potentially occuring in each pixel. 

 

All assessed species of amphibians, birds and mammals (all Red List Categories)

 

all_categories_no_ESH

 

Download: species richness raster (zipped tiff file, 9.21 MB); image (png, 7.38 MB)

 

Threatened  (CR, EN, VU)  amphibians, birds and mammals

Only species assessed as CR (Critically Endangered), EN (Endangered) and VU (Vulnerable). 

threatened_species_no_ESH

 

Download: species richness raster (zipped tiff file, 1.84 MB); image (png, 3.49 MB)

 

 

Range-Size Rarity

Range-size rarity is calculated from the area of the pixel divided by the area of the range for each species, i.e. the proportion of the species' range contained within the given pixel. These values are summed across all species to show the aggregate importance of each pixel to the species occuring there.

 

Calculations were applied at the species-season level. In otherwords, where a species has more than one seasonality recorded, the range for each seasonality coded is treated as a separate 'range' in the analysis. This is mostly applicable to birds and some migratory mammals, as each seasonal range could house a globally relevant aggregation of a given species.

 

All assessed species of amphibians, birds and mammals (all Red List Categories)

 

RSR_all_categories

 

Download: range rarity raster (zipped tiff file, 35.69 MB); image (png, 5.58 MB)

 

Threatened  (CR, EN, VU)  amphibians, birds and mammals

Only species assessed as CR (Critically Endangered), EN (Endangered) and VU (Vulnerable). 

RSR_CRENVU_cropped

 

Download: range rarity raster (zipped tiff file, 37.46 MB); image (png, 2.81 MB)

 

 

More details on IUCN Red List species selection and processing

The data was filtered based on the Presence (is/was the species in this area?), Origin (why/ how the species is in this area?) and seasonality (what is the seasonal presence of the species in the area?) fields. 

 

The selection was limited to species with:

 

  • Presence = 1 (extant) or 4 (possibly extinct)

  • Origin = 1 (native) or 2 (reintroduced)

  • Seasonality = 1 (resident) , 2 (breeding season) , 3 (non-breeding season), 4 (passage) or 5 (seasonal occurrence uncertain). 

The raster is at 5 km resolution at the equator.

 

Acknowledgement

These datasets were put together with the help of UN Environment Programme World Conservation Monitoring Centre.


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