Visser, A. W. Danish Institute for Fisheries Research, awv@dfu.min.dk
Jonsson, P. W. Tjarno Marine Biological Laboratory, per.jonsson@tmbl.gu.se

 
ON THE REORIENTATION OF NON-SPHERICAL PREY PARTICLES IN A FEEDING CURRENT
 
Much attention in plankton ecology has been directed to the question of prey selection. Some factors that have been considered are size, chemical composition and the escape ability of prey. To date, little consideration has been devoted to the influence of the shape of prey particles. Potentially, non-spherical prey can re-orientate in a radial flow field, and impact on the predator's feeding structures in a non-random manner. Herein, we formalise a process whereby this reorientation can occur, and present a model which predicts the orientation of an elliptic prey as a function of its eccentricity, size and the deformation rate of the fluid flow. Furthermore, we consider the turbulent erosion of the feeding current to estimate a limit where particles can be considered randomly orientated. Finally, comparisons are made to preliminary laboratory experiments examining the reorientation of cylindrical particles in a siphon flow.
 
Day: Monday, Feb. 1
Time: 04:15 - 04:30pm
Location: Sweeney Center
 
Code: SS01MO0415S