伦敦动物学会（Zoological Society of London）蝙蝠专家凯特·琼斯说，“它们也是关键的指标物种，能提供有关生态系统健康状况的信息。
They are also a key indicator species that can provide information on the health of an ecosystem.
科学家们已经设定了一些主要环境指标的安全阈值，而一旦超出这些值，将会危害到地球物种的生存。
Scientists have set thresholds for key environmental processes that, if crossed, could threaten Earth's habitability.
并从指示物种，结构-功能-组成，压力-响应等方面介绍了生态系统完整性评价指标；
The indicators of ecosystem integrity can be grouped into indicator species, structure-function-composition indicators, and stress-response indicators.
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