The producers are the terrestrial, salt marsh plants, aquatic plants, and algae. The primary consumers are insects, fishs, and snails. The secondary consumers are rats, frogs, and fishes. The tertiary consumers are snakes, cranes, ducks, and sparrows. The one quaternary consumer is the hawk.
Reference: http://www.tutorvista.com/content/biology/biology-iv/ecosystem/food-web.php
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