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In Ecosystems. Organisms tend to get phosphorus from their local ecosystem. An  organism can also get nitrogen from its local ecosystem. Nitrogen  is added to the organism's local ecosyste â¦ m by bacteria from the  air.
Two nutrients that aquatic plants and animals need to grow are Nitrogen and Phosphorus. Nitrogen. Aquatic organisms need nitrogen to live and can find it in different sources throughout nature. There are two ways a living organism can get the nitrogen it needs:1  Eat aquatic plants, such as blue-green algae, which take nitrogen from the water and convert it to ammonia or nitrate.wo nutrients that aquatic plants and animals need to grow are Nitrogen and Phosphorus. Nitrogen. Aquatic organisms need nitrogen to live and can find it in different sources throughout nature. There are two ways a living organism can get the nitrogen it needs: