Relative risk of extinction of passerine birds on continents and islands

摘要: Greater numbers and higher proportions of recent species extinctions have been on islands rather than continents. In contrast, predictions massive future stem from the current clearing continental, tropical forests1. For instance, since 1600, 97 out 108 bird islands2. However, 452 total 1,111 currently considered to be threatened are continental3. Island flora fauna uniquely vulnerable human introduction previously absent predators, diseases other menaces4, whereas continents not so ecologically naive. So could continental based island histories exaggerated1? Most small geographic ranges5, ranges inevitably smaller those species. a given range size, how do compare? Here we compile thepasserine (perching) birds Americas. Corrected for more—not less—likely threatened. We use this unexpected vulnerability with produce map showing where losses might occur in long term.