2All of the major phyla of animals are represented in the plankton All of the major phyla of animals are represented in the plankton. Remember: In the sea, microscopic plantlike organisms form the base of the food chain.
3This means most of the organisms that feed on these plant like organisms are also small.
4With such a wealth of microscopic food, organisms take advantage of this rich food supply either as a larval form or as an adult.
5Some of these organisms are herbivores feeding on the microscopic plants. Some are predaceous carnivores which feed on the herbivores or other carnivores.
6Those organisms that spend their entire life as plankton are called holoplankton.
7Those organisms that spend part of their life as plankton are called meroplankton.
8We'll take a look ata few examplesfrom each group!