普氏原羚种群数量变化与栖息地质量及人为干扰程度有密切相关。
These changes are related to the quality of animal habitat and the degree of artificial disturbance.
另一个指标，地球生命指数，是1 686种脊椎动物的种群数量变化的平均数。
Another indicator, the Living Planet Index, averages changes in the sizes of populations of 1, 686 vertebrate species.
种群统计是种群生态学研究的核心，主要研究种群在时间和空间上的数量变化规律。
Population demography is the core of the research in population ecology, which mainly deals with changing laws of the population amount along with time and space.
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