As such, they are key species for understanding and predicting impacts of global change on Antarctic and sub-Antarctic marine ecosystems.

因此，在理解和预测全球变化对南极和亚南极海洋生态系统影响方面，它们是关键物种。

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These include the centuries-old custom of "bul", where leaders would call a temporary stop to fishing for key species in order to give fish stocks an opportunity to replenish.

这些传统包括几个世纪以来被称之为“bul”的旧习俗，领导人会要求暂停捕捞一些重要种类的鱼，给鱼类总储备量繁衍补充的机会。

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Top predators are key to keeping populations of key species from growing too large.

大型捕食者是使主要的物种种群不会生长过大的关键因素。

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These sites are well used by local people, the woodlands are sympathetically managed for wildlife and conservation of key species which includes co-ordinated management and felling.

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Some key prey species like sea butterflies may be harmed.

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Invasive species scientist Jill Key says they must be preserved.

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