某支生物谱系的演化终结或整支谱系的消亡。当一个物种的最后一个个体死亡后，称该物种灭绝。也指一种特定的生物或一群发的全球性死亡和消失的现象。 种群灭绝的原因是由于种群丧失了进化潜能。
这在导致整个鲑鱼种群灭绝的案例中最为明显。
This is most evident in cases where it results in the extinction of entire salmon populations.
避免种群灭绝不仅必须生存，而且要繁殖。
To avoid going extinct a population must not only survive, but also reproduce.
看起来很清楚，所发生的是一起极端年份导致种群灭绝的典型事例。
What has happened looks like a clear case of extinction driven by three extreme years.
应用推荐