Fields, D. M.. Georgia Institute of Technology, david.fields@biology.gatech.edu
Yen, J. M.. State University of New York,
Miller, M. W.. Georgia Institute of Technology,
Weissburg, M. J.. Georgia Institute of Technology,

 
BEHAVIORAL THRESHOLDS FOR EUCHAETA RIMANA IN RESPONSE TO FLUID MECHANICAL SIGNALS.
 
The behavior of copepods is not random. Copepods display a variety of behavioral patterns which allows them to capture food items, escape predators and be receptive to potential mates. An implicit assumption of studying their behavioral repertoire is that they are able to discern different signals and that the uniqueness of the signal underlie the different behavioral responses. Here we examined the fluid mechanical signals involved in eliciting different behaviors in the predatory calanoid copepod Euchaeta rimana. The signal was generated using a short duration, pressure driven water jet controlled by a solenoid valve. The amount of fluid displaced and the direction of the predominant flow was controlled and reproducible. Behavioral observations of E. rimana were done using Shlieren optics. Laser sheet technology and PIV was used to quantify the fluid disturbances created by laboratory generated signals and free swimming prey. Our results show the activity of the animal increased with increasing speed of the stimulus. Three different behavioral responses were observed each with a characteristic fluid speed threshold. The results support the hypothesis that mechanoreception is sufficient to elicit numerous different behavior responses in copepods. In addition, the threshold corroborates our present knowledge of the behavioral ecology of this animal.
 
Day: Thursday, Feb. 4
Time: 10:30 - 10:45am
Location: Hilton of Santa Fe
 
Code: SS16TH1030H