食物链营养级

1
food chains trophic levels
... food chain 食物链 food chains trophic levels 食物链营养级 food cycle 营养循环 ...

1
有些生物存在于以甲烷为第一营养级的食物链中。甲烷是从地球内部可燃气体，通常在海底渗出。
Some creatures are part of food chains that begin with methane gas which seeps from the Earth's interior in particular places, frequently at the bottom of the sea.
2
绝大部分生物都是食物链中的一部分，它是以地球内部特殊部位缓慢渗出的甲烷为第一营养级，而这些气体经常在海洋底部出现。
Most, but not all. Some creatures are part of food chains that begin with methane gas which seeps from the Earth's interior in particular places, frequently at the bottom of the sea.
3
苹果树、金纹细蛾及其寄生蜂通过取食、寄生、重寄生等方式，在自然界中构成了4级营养食物链（网），相互依存，协同进化。
The apple trees, Lithocolletis ringoniella and its parasitic wasps constituted the 4 grade nutritional food chain(web) in the natural capital, and they were interdependent and coevolution.

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