它们无论作为顶端掠食者还是过分捕捞的指示生物都在生态系统中扮演着重要的角色。
They can also have an important role in the ecosystem as top predators or as indicators of overfishing.
他说，由于蚂蚁是特别好的“生物指示器”，环境专家可以利用这些资料，主要依据某个生态系统内的蚁群数量来考察该系统是否状况良好。
He said that because ants were exceptionally good "bio-indicators," environmental experts could use the data to check if an entire ecosystem is healthy, based mostly on its ant population.
小型哺乳动物和土壤动物是陆地生态系统食物链中重要环节，在生物指示研究中具有十分重要的作用。
Small mammals and soil animals are key links of trophic chains in terrestrial eco-systems, and play very important roles in bio-indicative studies.
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