但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
浮游动物（微小的海洋生物）通常吃浮游植物，而其本身又是小鱼和其它动物的捕食对象。
Phytoplankton are typically eaten by zooplankton - tiny marine animals - which themselves are prey for small fish and other animals.
浮游动物包含各种各样的小生物体，从单细胞原生动物到水母、磷虾和桡足类动物，为海洋食物链提供了基本的链接。
The zooplankton, which encompass a wide range of little organisms from single-cell protozoa to creatures such as jellyfish, krill and copepods, provide the basic link in the ocean food chain.
发表于《科学》杂志上的这项研究表明，古老的无脊椎动物的主要食物是海洋表面的浮游动物。
The study, published in the journal Science, suggests that the ancient invertebrates' main diet was zooplankton, which are tiny ocean surface creatures.
浮游植物是浮游动物和其它海洋动物的食物，可以说是海洋的庄稼。
Phytoplankton are the microscopic plant life that zooplankton and other Marine animals eat, essentially the grain crop of the world's oceans.
浮游植物是浮游动物和其它海洋动物的食物，可以说是海洋的庄稼。
Phytoplankton are the microscopic plant life that zooplankton and other Marine animals eat, essentially the grain crop of the world's oceans.
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