An aquatic ecosystem must have solar energy as well as carbon dioxide and water to allow the algae and plant life to be able to carry out photosynthesis. It also requires nitrogen and phosophorus, which enable the producers to grow. The temperature, carbon dioxide and oxygen gas all comprise abiotic factors, important to life in an aquatic environment. Salt content is important in a marine ecosystem. In terms of biotic components, the protists including algae and other microorganisms, bacteria, fungi, plant and animal life are all important parts of aquatic food webs. All are interdependent for the continued health of the ecosystem.