Main Conclusions
Extinction risk increases with range loss, but this relationship is strongly modulated by absolute range and varies across taxa. For a given absolute range, the effect of range loss on extinction risk largely disappears, suggesting greater vulnerability in small-ranged taxa (and v.v.). However, model comparison indicated that extinction risk is best explained when both absolute range size and range change are included, implying both capture complementary aspects of vulnerability. By linking extinction dynamics to both absolute range and range change, our results provide a deep-time perspective on the mechanisms underlying genus persistence and vulnerability.
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