Figure 2.

The global growth (left) and distribution of the realized and potential impact to biodiversity associated with amphibian invasions. The current values of the sub-indicators (1.1, 2.1–2.3) are assumed to be at the level of the most recent record of introduction (dashed lines, e.g. 7 for predation). The distribution of potential impact represents the global risk of impact expressed as summed global climate suitability of species across regions and in countries where these multiple species are known to have been introduced, estimated using ecological niche models (electronic supplementary material, S1). In each case, the sums are based on the relevant species and subset of types of impact of concern, among the total of 11 species and 9 impact types (electronic supplementary material, S1).