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JPR Advance Access originally published online on September 27, 2005
Journal of Plankton Research 2005 27(10):1067-1071; doi:10.1093/plankt/fbi066
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org.

SHORT COMMUNICATION

Turbulence decreases the hydrodynamic predator sensing ability of the calanoid copepod Acartia tonsa

Owen M. Gilbert{dagger} and Edward J. Buskey*

The University of Texas at Austin, Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 7873, USA {dagger} Present Address: Ecology and Evolutionary Biology, 135 Anderson Biology Laboratory, Rice University, Houston, TX 77005, USA

* Corresponding Author: buskey{at}utmsi.utexas.edu

Received May 20, 2005; accepted in principle July 26, 2005; accepted for publication September 5, 2005; published online September 27, 2005
Communicating editor: K.J. Flynn

The copepod Acartia tonsa is very sensitive to hydrodynamic signals, including those made by approaching predators, and responds with a vigorous escape jump. Whether the presence of moderate turbulence changes this ability to detect hydrodynamic signals was investigated by comparing the response of copepods to velocity gradients created by a siphon flow in turbulent and still water. Turbulence decreased the distance at which A. tonsa initiated escapes from the siphon and increased the capture rate, indicating decreased sensitivity to hydrodynamic signals, but did not trigger unnecessary escape reactions that might produce fatigue.


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