Abstract
The influence of polyp posture on local velocity profiles around the suspension-feeding tentacles was determined using a scale model of a polyp of the tropical gorgonian Pseudopterogorgia acerosa (Pallas). Polyp flexion was found to be an important mechanism for maintaining reduced and less variable flow velocities at the level of the polyp: local velocities were reduced by 40% in mainsstream velocities of 5 cm·s −1, by 80% in mainstream velocities of 10 cm·s −1, and by 50% in mainstream velocities of 20 cm·s −1. Flow patterns indicated a recirculation of water behind the polyp at intermediate mainstream velocities that may further enhance particle capture. Polyp flexion may act in conjuction with colony flexibility to increase the range of current velocities over which suspension-feeding is successful.
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