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We studied the feeding behavior of the surface-deposit feeder Saccoglossus kowalevsbl under oscillatory flows in the laboratory. Low oscillatory flow (peak speed = 10 cm S') without assoclated sediment transport had no effect on egestion rates in comparison to no-flow conditions. Moderate flows (peak speed = 15 and 17.5 cm S-') with incipient sediment trdnsport caused an increase in egestion rates of 35 to 100% relative to low-flow rates. High flow (peak speed = 25 cm S') with bulk sediment transport caused a decrease in egestion rates to one-third the low-flow rates. When compared to a functional response curve previously determined for S. kou-dl~vskii, our data show that under high flow S. kowalevskii does not feed at rates predicted by the availdble food resources (as measured by chlorophyll a concentration). Under moderate flow, S. kowalevskii is stimulated to feed at higher rates than predicted by the available food resources. And under low flow. S. kowalevskii appears to be unaffected by flow and continues feeding at rates predicted by the available food resources. Flow and the associated sediment flux thus lead to an envelope of egestiun rates about the no-flow functional response, indicating that the feed~ng behavior of S. kowalevskll 1s a function both of available food resources and flow regime. Laboratory still-water functional responses and simple ttreding models are thus inadequate. Accurate extrapolation and prediction require that flow and sediment flux parameters be incorporated in feeding models.

Effect of flow and sediment transport on feeding rate of the surface-deposit feeder Saccoglossus kowalevskii