It is one of the factors controlling the size of competing populations, and in extreme cases it may lead to the extinction of one of the competing species.

它是控制竞争种群规模的因素之一，在极端情况下，它可能导致一个竞争物种的灭绝。

youdao

Like when populations of the same species are isolated from each other and then develop into two different directions and end up as two distinct species.

例如，当同一物种的种群彼此隔离时，然后就会向着两个不同的方向发展，从而形成两个截然不同的物种。

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This division set the stage for allopatric speciation among populations of fishes and other marine species.

这种划分为鱼类和其他海洋物种的分区物种形成奠定了基础。

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But more and more Asian Carp are edging out the populations of those native fish species, and keep finding their way into Isaak's nets.

VOA: standard.2010.07.19

Michael Tobias (MT): In terms of priorities for saving habitat, species and populations, where do you now stand?

FORBES: Conservation International: Stemming the Tide of Environmental Crises, Part Two

The RSPB lists hen harrier as a red status species, meaning it is threatened and populations have suffered severe declines in numbers.

BBC: Hen harrier sightings sought in Cairngorms

Home to breeding populations of 14 species and approximately 20, 000 birds, one of the islands' major threats is predation of eggs and chicks by rats.

BBC: Isles of Scilly in rat removal project