Trophic Levels

Autotrophs

Green plants (Producers): (Trophic Level 1)

• Green plants and some blue green algae.
• Phytoplankton are the primary producers in the oceans and include diatoms (unicellular algae), coccolithophores (unicellular, eukaryotic rotest), cyanobacteria (Blue green alage)- synechococcus, prochlorococcus, nostoc, spirogyra; dinoflagellates etc.

Heterotrophs

Herbivore (Primary consumers): (Trophic Level 2)

• Crustaceans form a very large group of arthropods which includes crabs, lobsters, crayfish, shrimp, krill and barnacles
• Marine herbivores are found within four groups of species in the animal kingdom-invertebrates, fish, reptiles and mammals and include zooplankton, molluscs, the green sea turtle, the marine iguana and some fish species. Manatees and dugongs are the only herbivores among marine ....