Endemic Species Richness - Amphibians

As the species ranges have not been refined by altitude and landcover (i.e. Area of Habitat), there may be a fair amount of unsuitable habitat in the raw ranges, resulting in errors of commission. Global species maps from the red list represent current, known limits of distribution for individual species within their native historical range. Although these maps have many uses, they generally have a coarse resolution and consequent limitations. Species ranges are mapped as generalized polygons which often include areas of unsuitable habitat, and therefore species may not occur in all of the areas where they are mapped. In general, for range-restricted taxa, ranges are mapped with a higher degree of accuracy, sometimes down to the level of individual subpopulations, compared with more widely distributed species.