The crash reduces the population size toward the original level.

随着暴跌,导致种群数量回到它的初始水平.

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The mean effective population size could be estimated as a harmonic means of the Ne.

估计出平均有效种群大小,作为所有世代Ne的调和平均值.

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Do predators and parasites regulate the population size of their prey?

捕食者和寄生者是否能够调节其猎物种群的大小 呢 ?

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But this was largely a reflection of population size.

不过这在很大程度上也反映了人口规模.

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In many natural populations carrying capacity ( and hence population size ) fluctuates seasonally.

在自然群体中,群体数量随季节波动.

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Population size: adult females in 1982.

数量: 1982年调查产区有繁殖母猪1万余头.

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The ratio of sample size to population size.

抽样规模与人口规模的比率.

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The interactions of predators and their prey affect population size in complex ways.

捕食和被捕食的相互复杂关系影响着群体的规模.

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Small population size, fragmented distribution range and natural reproductive depression are the main threats.

本种居群小, 分布区片段化和自然更新能力减退.

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Population size may also be reduced by density independent factors a category that includes natural catastrophes.

群体规模也可因为密度无关因子而降低,包括自然灾难.

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