Your best bet is to do some research and find some visual aids, and make your model based off that information.
Phytoplankton make up the whole first trophic level.
Phytoplankto.
Phytoplankton make their own food through photosynthesis, and are therefore autotrophs and producers.
They make it with photosynthesis, like all plants.
Phytoplankton get eaten by Zooplankton and Zooplankton get eaten by Herring but Phyotplankton make their own energy form sunlight so it's a Producer.
Phytoplankton and zooplankton
phytoplankton. phytoplankton.
whales
Victor J Bierman has written: 'User manual for two-dimensional multi-class phytoplankton model with internal nutrient pool kinetics' -- subject(s): Eutrophication, Phytoplankton
Zooplankton eat phytoplankton
Copepods will eat phytoplankton.
Phytoplankton eats all other kinds of Plankton!?.