In order to assess the general applicability of recent field experiments with predatory infauna, we searched the literature and found 48 well-documented cases of infaunal consumption by such predators. In 63 % of the cases detailed enough to make a determination, the predators ate other predators. Multiple trophic levels within the infauna are probably a common feature of many soft-bottom communities.
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Commito, John A., and William G. Ambrose Jr. Multiple Trophic Levels in Soft-Bottom Communities. Marine Ecology- Progress Series (1985) 26:289-293.
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