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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 for amphibians, birds and mammals. As the species ranges have not been refined (for example, by altitude and landcover), 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 there are polygon maps. The analyses are only relevant for terrestrial areas, as marine areas will only be represented by birds and mammals.

 

More details on IUCN Red List species selection and processing.

Each species richness and range-size rarity analysis has been performed for: 

  1. All Red List Categories 
  2. Threatened species - species assessed as: 
    • CR (Critically Endangered), 
    • EN (Endangered) and 
    • VU (Vulnerable).

 

As well as a zip file containing the raster geotiff files, a png image (2,000 dpi) of each raster is available.

The analyses available to download from this page are:

Red List version 2021-3 

 

Red List version 2017-3 

 


Red List version 2021-3 Species Richness

 

The raw IUCN ranges for amphibians, birds and mammals were intersected with a grid of 865 km2 hexagon cells, clipped to the coastline, to give the number of species potentially occurring in each cell. Marine-only species were excluded from the analyses.


Each species richness count was exported to a raster in the Mollweide projection, a projection that preserves equal areas across the globe. The raster cell size is 900 km2 (30 km square). For the png images, the raster was reprojected to WGS84 and symbolised (in ArcMap) using the Standard Deviations (2.5) stretch.


The raster zip files are each less than 1 MB. The high resolution image pngs are each between 6 MB and 9.1 MB. Clicking on the thumbnail image will download a lower resolution pdf image.

 

Group(s) All Red List Categories Threatened Species
Amphibians, Birds and Mammals

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

Amphibians

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

 

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

 

Birds

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

 

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

 

Mammals

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

 

species richness raster  (zipped geotiff file);

 

high resolution image  (png)

 


 


Red List version 2017-3 Species Richness

 

The raw IUCN ranges were rasterised and summed across all amphibian, bird and mammal species to show the number of species potentially occurring in each pixel. 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.

 

Amphibians, birds and mammals - All Red List Categories

 

all_categories_no_ESH

 

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

 

 

Threatened amphibians, birds and mammals

 

threatened_species_no_ESH

 

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

 

 


Red List version 2017-3 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. That is, 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.

 

The raster resolution is about 5 km at the equator.

 

Amphibians, birds and mammals - All Red List Categories

 

RSR_all_categories

 

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

 

 

Amphibians, birds and mammals - Threatened

 

RSR_CRENVU_cropped

 

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

 

 

Acknowledgement

The 2017-3 datasets were put together with the help of UN Environment Programme World Conservation Monitoring Centre.

 

 


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). 

 

More details on the ISEA10 hexagon grid

 

The ISEA10 grid is a geodesic discrete global grid system, defined on an icosahedron and projected to the sphere using the inverse Icosahedral Snyder Equal Area (ISEA) Projection. This corresponds to a hexagonal grid composed of individual units (cells) that retain their shape and area (865 km2) throughout the globe. These are more suitable for a range of ecological applications than rectangular grids.

 


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