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The primary function of an ecosystem is a systematic transfer of energy from one organism to another. This energy flow drives the movement of vital nutrients throughout the ecosystem
http://www.ehow.com/about_6669951_role-producers-e...
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In an ecosystem, producers are those organisms that use photosynthesis to capture energy by using sunlight, water and carbon dioxide to create carbohydrates, and then use that energy
http://www.ehow.com/how-does_5192468_producer-ecos...
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cacti, desert shrubs, and brush.
http://wiki.answers.com/Q/Who_are_the_producers_of...
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Phytoplankton (microalgae), seaweeds (macroalgae) and chemoautotrophic bacteria in order of declining importance.
http://wiki.answers.com/Q/What_are_producers_in_a_...
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