Danger of zooplankton feeding : the fluid signal generated by ambush-feeding copepods
MetadataShow full item record
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.
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.
Suggested CitationPreprint: Kiørboe, Thomas, Jiang, Houshuo, Colin, Sean P., "Danger of zooplankton feeding : the fluid signal generated by ambush-feeding copepods", 2010-06, https://doi.org/10.1098/rspb.2010.0629, https://hdl.handle.net/1912/3930
Showing items related by title, author, creator and subject.
Variations in copepod proteome and respiration rate in association with diel vertical migration and circadian cycle Maas, Amy E.; Blanco-Bercial, Leocadio; Lo, Ali; Tarrant, Ann M.; Timmins-Schiffman, Emma (University of Chicago Press, 2018-08-16)The diel vertical migration of zooplankton is a process during which individuals spend the night in surface waters and retreat to depth during the daytime, with substantial implications for carbon transport and the ecology ...
Uttieri, Marco; Nihongi, Ai; Hinow, Peter; Motschman, Jeffrey; Jiang, Houshuo; Alcaraz, Miquel; Strickler, J. Rudi (Nature Research, 2019-01-24)Oil spills are one of the most dangerous sources of pollution in aquatic ecosystems. Owing to their pivotal position in the food web, pelagic copepods can provide crucial intermediary transferring oil between trophic levels. ...
Almada, Amalia A.; Tarrant, Ann M. (2016-05)Copepods are abundant crustaceans that harbor diverse bacterial communities, yet the nature of their interactions with microbiota are poorly understood . Here, we report that Vibrio elicits targeted transcriptional ...