Clearing a forest, draining a wetland, damming a river or dynamiting a coral reef to kill its fish can more readily eliminate species with small ranges than more widespread species.

• 分布範围小的物种跟範围大的物种比起来，更容易因森林砍伐、地乾涸、流筑坝或珊瑚礁炸鱼等原因而绝灭。