Discussion
Expert range maps aim to provide globally consistent and comparable
sources of data for mapping biodiversity and endangerment scalably,
comparably and representatively. Yet, for all groups examined, the data
fail to meet even these basic expectations. Stemming from their
differing designs, both within and between groups, there are obvious
methodological changes, biases and inconsistencies. Consequently,
comparing analyses meaningfully, especially between regions or taxa, may
not be possible.