Feeding behaviour of the sea cucumber <Emphasis Type="Italic">Cucumaria frondosa</Emphasis> (Echinodermata: Holothuroidea) in the laboratory and the field: relationships between tentacle insertion rate,flow speed,and ingestion |
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Authors: | E H Holtz Bruce A MacDonald |
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Institution: | (1) Department of Biology and Centre for Coastal Studies and Aquaculture, University of New Brunswick, P.O. Box 5050, Saint John, NB, E2L 4L5, Canada |
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Abstract: | The sea cucumber, Cucumaria frondosa, is a benthic suspension feeder that captures food particles on its tentacles and then inserts them into its mouth one at
a time. Previous studies have suggested that tentacle insertion rate (TIR) could be a useful indicator of food intake. The
present study determined whether flow velocity affects TIR and whether TIR is a good indicator of ingestion. Video observations
of sea cucumbers in Passamaquoddy Bay (45°01.70N, 66°55.74W) in August 1995 showed that TIRs increased with velocities up
to 55 cm s−1 and decreased steadily at flows above that up to 130 cm s−1. In October 2006, laboratory flume studies were carried out on specimens collected from the same site in the previous August.
Temperature and salinity (12°C and 32) in the flume were the same as in the field at the time of collection. There was high
individual variation in feeding behavior at free-stream velocities of 4–40 cm s−1 and TIR was independent of flow. As the number of tentacle insertions increased in the flume experiments, the amount of chloropigments
in the digestive tracts of the sea cucumbers also increased. This suggests that TIR, which can be measured non-intrusively
using remote video techniques, could be a good indicator of feeding behavior and ingestion in C. frondosa. |
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