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Journal of Plankton Research Vol.24 no.3 pp.215-223, 2002
© Oxford University Press 2002

Detection and capture of inert particles by calanoid copepods: the role of the feeding current

Marie H. Bundy1 and Henry A. Vanderploeg2

1 The Academy Of Natural Sciences Estuarine Research Center, 10545 Mackall Road, St. Leonard, Maryland 20685, USA 2 Great Lakes Environmental Research Laboratory, 2205 Commonwealth Blvd., Ann Arbor, Michigan 48105, USA

M. H. Bundy. E-Mail: bundy{at}acnatsci.org

Although there is a scarcity of supporting empirical evidence, it has long been suspected that calanoid copepods use mechanoreception to detect the presence and location of potential prey items entrained in the feeding current. In this study, we document the first observations showing a freely swimming calanoid copepod, Skistodiaptomus oregonensis, attacking prey-sized, non-motile, inert particles entrained in the feeding current before the particles contact the copepod's sensory appendages. Feeding current geometry, fluid velocities and associated behaviours that characterize these interactions are described. The results of this study show how copepod swimming behaviour, coupled with a low-velocity feeding current, not only increases copepod encounter rates with inert prey by increasing direct contact rates, but also increases the probability of detecting and capturing remotely located prey that have well-developed escape responses. In turbulent regimes, a far-reaching, low-velocity feeding current should increase encounter rates, but only if coupled with behaviours that quickly minimize separation distances once prey is detected.


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