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Question: How to add my photo to my forum profile? 50 TOEFL lecturesA great variety of English listening comprehension tests that will help you increase your TOEFL test score. Wanted: Feedback on TOEFL Listening Exercises. Listen to part of a lecture from a marine biology class. Prof: You’ve been reading this month about food chains and food webs. Today we’ll discuss these in relation to seafood.
How many of you like seafood? In fact, I’m on a seafood diet. I see food, I eat it. Who can remind us what a trophic relationship is? S: It’s what an organism eats, and uh, the things that eat that organism. Trophic relationships describe the relationship between producers and consumers, so they help us diagram food chains and food webs.
Now, in marine ecosystems, like other ecosystems, food is needed for matter – growth and reproduction – and for energy – metabolic processes within the body. Also like other ecosystems, marine ecosystems have producers, consumers and decomposers. The primary producers are autotrophic plankton. Herring fish eat level 3, carnivorous zooplankton. The carnivorous zooplankton eat trophic level 2, herbivorous zooplankton. And herbivorous zooplankton eat level number 1, phytoplankton, which is a type of autotroph.