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Answers. 1  A food chain is the what animal eats what animal. It really should be called a food web because many animals eat many other animals. The food web is a representation of an energy pyramid. An energy pyramid just shows where the energy is going. The sun is at the bottom, then plants and so on. There really are not many differences between them.
So it is the energy produced by these algae that forms the basis of the food pyramid in the ocean. (from Duxbury and Duxbury, 1994, An Introduction to the World's Oceans). The pyramid represents energy in the ocean. The widest part is the microscopic algae.Perhaps I should add here that plankton are the very small drifters in the ocean. Phytoplankton are the plants or algae, and zooplankton are the animals.). Note also that at the bottom there are 1000 energy units available. The next level up is the herbivorous (plant eating) zooplankton.