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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.
Organisms in a natural community also play diff erent roles within their ecosystem. An organismâs role within an ecosystem depends on how it obtains its food. Plants and animals obtain their food in very diff erent ways, so they have very diff erent roles in an ecosystem.Th e way in which an organism obtains food also aff ects its interactions with other organisms in the ecosystem.EL 5.1 The Roles of Organisms in an Ecosystem 123 Th e process of photosynthesis can also be written as a word equation:Sunâs energy + water + carbon dioxide â food (sugar) + oxygenOxygen is another product of photosynthesis.