Danger of zooplankton feeding : the fluid signal generated by ambush-feeding copepods


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dc.contributor.author Kiørboe, Thomas
dc.contributor.author Jiang, Houshuo
dc.contributor.author Colin, Sean P.
dc.date.accessioned 2010-10-06T13:44:36Z
dc.date.available 2010-10-06T13:44:36Z
dc.date.issued 2010-06
dc.identifier.uri http://hdl.handle.net/1912/3930
dc.description Author Posting. © The Authors, 2010. This is the author's version of the work. It is posted here by permission of The Royal Society for personal use, not for redistribution. The definitive version was published in Proceedings of the Royal Society B: Biological Sciences 277 (2010): 3229-3237, doi:10.1098/rspb.2010.0629. en_US
dc.description.abstract Zooplankton feed in either of three ways: they generate a feeding current, cruise through the water, or they are ambush feeders. Each mode generates different hydrodynamic disturbances and hence exposes the grazers differently to mechanosensory predators. Ambush feeders sink slowly and therefore perform occasional upward repositioning jumps. We quantified the fluid disturbance generated by repositioning jumps in a mm-sized copepod (Re ~ 40). The kick of the swimming legs generates a viscous vortex ring in the wake; another ring of similar intensity but opposite rotation is formed around the decelerating copepod. A simple analytical model, that of an impulsive point force, properly describes the observed flow field as a function of the momentum of the copepod, including the translation of the vortex and its spatial extension and temporal decay. We show that the time-averaged fluid signal and the consequent predation risk is much less for an ambush feeding than a cruising or hovering copepod for small individuals, while the reverse is true for individuals larger than about 1 mm. This makes inefficient ambush feeding feasible in small copepods and is consistent with the observation that ambush feeding copepods in the ocean are all small, while larger species invariably use hovering or cruising feeding strategies. en_US
dc.description.sponsorship TK was supported by a grant from the Danish Research Council and by a Niels Bohr Fellowship to TK and HJ was supported by National Science Foundation grants NSF OCE-0352284 & IOS-0718506. en_US
dc.format.mimetype video/mpeg
dc.format.mimetype application/pdf
dc.language.iso en en_US
dc.relation.uri http://dx.doi.org/10.1098/rspb.2010.0629
dc.subject Viscous vortex ring en_US
dc.subject Copepod jump en_US
dc.subject Acartia tonsa en_US
dc.subject Optimal foraging en_US
dc.title Danger of zooplankton feeding : the fluid signal generated by ambush-feeding copepods en_US
dc.type Preprint en_US

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