Aspects of deposit-feeding by the PolychaeteClymenella torquata

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Abstract
Clymenella torquata (Polychaeta: Maldanidae) traditionally is considered a sub-surface deposit-feeder. We report an undescribed behavior in which the worm uses its posterior segments to collect surface material. Sediment obtained in this manner can be used for tube construction or can be ingested. Laboratory experiments monitoring the effect of Clymenella on sub-surface bacteria suggest that the polychaete can stimulate their growth (‘gardening’). We propose that surface deposit-feeding helps to explain several aspects of the worm's biology (gut contents, dichromatism, and regeneration of posterior segments).