And animals use each nitrogen isotope slightly differently.

动物对每种氮同位素的使用稍有不同。

So the researchers also measured the proportions of different carbon and nitrogen isotopes in whiskers from coyotes.

因此，研究人员还测量了郊狼胡须中不同碳同位素和氮同位素的比例。

The carbon and nitrogen isotopes in the fox bones supplied clues to what the foxes had eaten.

狐狸骨头中的碳和氮同位素提供了线索，我们由此可以得知狐狸吃过什么。

The researchers base their argument on the ratios of light to heavy nitrogen isotopes in ancient rocks from Australia.

研究人员是根据澳大利亚古老岩石中重氮同位素光的比率所得出的结论。

Generally, as carnivores consume protein-rich meat, certain nitrogen isotopes accumulate in their tissues— including the enamel of their teeth.

一般来说， 当食肉动物食用富含蛋白质的肉时，某些氮同位素会积聚在它们的组织中——包括牙齿的珐琅质。

To test this hypothesis, researchers have compared carbon and nitrogen isotope levels from the bones of extinct lemurs to the levels seen in the plants of the spiny forest.

为了验证这一假设，研究人员将已灭绝的狐猴骨骼中的碳和氮同位素水平与多刺森林植物中的碳和氮同位素水平进行了比较。

By measuring the abundance of that nitrogen isotope in this material, I can tell you that majestic old giants like this beauty here are actually composed of up to 85% material that's derived from salmon.

通过测量这种原料中氮同位素的丰度，我可以告诉你，那些雄伟非凡的古树，比如这一棵，实际上其构成成分中，有多达85%都是来自鲑鱼。