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Water Pumping in the Penduculate Barnacle Conchoderma Auritum

Published online by Cambridge University Press:  11 May 2009

Y. Achituv  and
T. Yamaguchi
Y. Achituv
Affiliation:
Department of Life Sciences, Bar Ilan University, Ramat Gan 52900, Israel.
T. Yamaguchi
Affiliation:
Department of Earth Sciences, Chiba University, Yayoi-cho, Chiba 263, Japan
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Extract

The cirral activity of the penduculate barnacle, Conchoderma auritum, was studied in a flow tank. The barnacles were exposed to different experimental water velocities and the response of the barnacles was recorded using a video system. In still and slow-moving water the barnacles show rhythmic cirral activity, the cirri extend and then withdraw into the mantle cavity. When water flow is accelerated the barnacles switch from rhythmic cirral activity to prolonged cirral extension, in which the cirri are extended in the water flow, facing the current. The water velocity at which barnacles switch from rhythmic activity to cirral extension depends on the size of the animal. During the rhythmic activity of Conchoderma water is pumped into the mantle through the ears. The prosoma serves as a piston which inhales the water into the capitulum and then ejects it at the apical end of the capitulum opening. This finding contradicts the generally accepted notion that the function of the ears of C. auritum is water ejection.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 77 , Issue 4 , November 1997 , pp. 1073 - 1082
Copyright
Copyright © Marine Biological Association of the United Kingdom 1997

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