Services Directory Login

Biodiversity_Intactness (Map Service)


View In:    ArcGIS JavaScript   ArcGIS.com   WMTS  

Current Version: 10.81

Service Description: The Global Biodiversity Index is a global estimate of how land use pressures have affected the numbers of species and individuals found in samples from local terrestrial ecological assemblages. The map represents the percent losses of originally present species with 1 km resolution. Using 2,382,624 records of data from the Projecting Responses of Ecological Diversity in Changing Terrestrial Systems (PREDICTS) database, a global database of how local terrestrial biodiversity responds to human impacts, the map models how sampled richness and abundance respond to land use pressures. The models also include 4 pressure variables—land use, land use intensity, human population density, and proximity to the nearest road. Values of the response variables are always expressed relative to an intact assemblage undisturbed by humans and therefore do not rely on estimates of absolute abundance or species richness, which vary widely among biomes and taxa.

The density of sampling is inevitably uneven; biomes that are particularly underrepresented, relative to their global ecosystem productivity, include boreal forests, tundra, flooded grasslands, and savannas and mangroves, meaning that less confidence can be placed in the results for these biomes. The data probably also under-represent soil and canopy species, and  may have overestimated the index by ignoring lagged responses and using sites that often have experienced some human impact as baselines.

Source


Map Name: Map

Legend

All Layers and Tables

Layers: Tables: Description: The Global Biodiversity Index is a global estimate of how land use pressures have affected the numbers of species and individuals found in samples from local terrestrial ecological assemblages. The map represents the percent losses of originally present species with 1 km resolution. Using 2,382,624 records of data from the Projecting Responses of Ecological Diversity in Changing Terrestrial Systems (PREDICTS) database, a global database of how local terrestrial biodiversity responds to human impacts, the map models how sampled richness and abundance respond to land use pressures. The models also include 4 pressure variables—land use, land use intensity, human population density, and proximity to the nearest road. Values of the response variables are always expressed relative to an intact assemblage undisturbed by humans and therefore do not rely on estimates of absolute abundance or species richness, which vary widely among biomes and taxa.

The density of sampling is inevitably uneven; biomes that are particularly underrepresented, relative to their global ecosystem productivity, include boreal forests, tundra, flooded grasslands, and savannas and mangroves, meaning that less confidence can be placed in the results for these biomes. The data probably also under-represent soil and canopy species, and  may have overestimated the index by ignoring lagged responses and using sites that often have experienced some human impact as baselines.

Source


Copyright Text: UNEP-WCMC, UCL, NHM, Imperial, CSIRO, Luc Hoffmann Institute, UCPH, Sussex

Spatial Reference:
102100

Single Fused Map Cache: true

Capabilities: Map,TilesOnly,Tilemap

Tile Info:
Initial Extent:
Full Extent:
Min Scale: 2.95828763795777E8
Max Scale: 577790.554289

Min LOD: 1
Max LOD: 10

Units: esriMeters

Supported Image Format Types: Mixed

Export Tiles Allowed: false
Max Export Tiles Count: 100000

Document Info: