它可以比较粗略地描述成是发生在固定周期（这个周期通常是一年一次）的包含某一个物种很多成员的集体旅行，并且只有在长途旅行后才有回报。
It can loosely be described as travel that takes place at regular intervals—often in an annual cycle—that may involve many members of a species, and is rewarded only after a long journey.
这是达尔文为新西兰本土动植物物种所描述的，它们在来自欧洲竞争物种被引进时灭绝了。
This was described by Darwin for indigenous New Zealand species of animals and plants, which died out when competing species from Europe were introduced.
竞争对物种的进化效应被称为“物种选择”；然而，这种描述可能具有误导性。
The evolutionary effect of competition on species has been referred to as "species selection"; however, this description is potentially misleading.
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