´╗┐Producers make up the trophic level that supports all other trophic levels.
In terrestrial ecosystems plants are the main producers.
In aquatic ecosystems the main producers are phytoplankton, photosynthetic protists,
bacteria, muliticellular algae, and aquatic plants.

Terrestrial plants:
Rush.jpg

Aquatic ecosystem producers:
Phytoplankton:
phytoplankton_070305.jpg

Photosynthetic Protists:
33303997.jpg

Bacteria:
Aquatic-Bacteria.jpg

Multiicellular Algae:
VLC073_Multicellular_algae.jpg

Aquatic Plants:
clear-dams-aquatic-plants-800x800.jpg
´╗┐