在海洋生物群落中，从植物、细菌或有机物开始，经植食性动物至各级肉食性动物，依次形成被食者与摄食者的营养关系称为食物链，亦称为"营养链"。食物网是食物链的扩大与复杂化，它表示在各种生物的营养层次多变情况下，形成的错综复杂的网络状营养关系。物质和能量经过海洋食物链和食物网的各个环节所进行的转换与流动，是海洋生态系统中物质循环和能量流动的一个基本过程。本书就带领读者去认识海洋中的食物链。
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