On the reorientation of non-spherical prey particles in a feeding current

Andre Visser, P.R. Jonsson

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Potentially, non-spherical prey can be re-oriented in a flow field and impact on the predator's feeding structures in a non- random manner. Herein, we quantify a process whereby this passive reorientation occurs, and present a model that predicts the orientation of a spheroidal prey as a function of its shape, size and the characteristics of the fluid flow For a radial flow field, elongated prey tend to align with their long axis parallel to streamlines. This theory is well supported by our results from a laboratory study of cylindrical particles in a siphon flow. The model is extended to a more realistic representation of copepod feeding currents. In this context, the spatial scale over which this process is active is proportional to epsilon (-1/4) where epsilon is the turbulent dissipation rate. For a range of natural turbulence levels, re- orientation efficiency can range from >90% (low turbulence) to
Original languageEnglish
JournalJournal of Plankton Research
Volume22
Issue number4
Pages (from-to)761-777
ISSN0142-7873
Publication statusPublished - 2000

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