To eat and not be eaten : optimal foraging behaviour in suspension feeding copepods
MetadataShow full item record
KeywordZooplankton fluid dynamics; Mortality risk; Optimal foraging; Copepod; Centropages typicus; Temora longicornis
Zooplankton feed on microscopic prey that they either entrain in a feeding current or encounter as they cruise through the water. They generate fluid disturbances as they feed and move, thus elevating their risk of being detected and encountered by predators. Different feeding modes generate different hydrodynamic signals to predators and different predator encounter speeds but may also differ in their efficiency; the optimal behaviour is that which maximizes the net energy gain over the predation risk. Here, we show by means of flow visualization and simple hydrodynamic and optimization models that copepods with a diversity of feeding behaviours converge on optimal, size-independent specific clearance rates that are consistent with observed clearance rates of zooplankton, irrespective of feeding mode, species and size. We also predict magnitudes and size-scaling of swimming speeds that are consistent with observations. The rationalization of the magnitude and scaling of the clearance rates of zooplankton makes it more suitable for development of models of marine ecosystems, and is particularly relevant in predicting the size structure and biomass of pelagic communities.
Author Posting. © The Author(s), 2012. 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 Journal of The Royal Society Interface 6 (2013): 20120693, doi:10.1098/rsif.2012.0693.
Showing items related by title, author, creator and subject.
Cronin, Thomas W.; Fasick, Jeffry I.; Schweikert, Lorian E.; Johnsen, Sonke; Kezmoh, Lorren J.; Baumgartner, Mark F. (2017-02)North Atlantic right whales (Eubalaena glacialis) feed during the spring and early summer in marine waters off the northeast coast of North America. Their food primarily consists of planktonic copepods, Calanus finmarchicus, ...
Whales and waves : humpback whale foraging response and the shoaling of internal waves at Stellwagen Bank Pineda, Jesus; Starczak, Victoria R.; da Silva, Jose C. B.; Helfrich, Karl R.; Thompson, Michael A.; Wiley, David N. (John Wiley & Sons, 2015-04-02)We tested the hypothesis that humpback whales aggregate at the southern flank of Stellwagen Bank (SB) in response to internal waves (IWs) generated semidiurnally at Race Point (RP) channel because of the presence of their ...
Pautzke, Sarah M.; Mather, Martha E.; Finn, John T.; Deegan, Linda A.; Muth, Robert M. (American Fisheries Society, 2009-12-10)Using acoustic telemetry on migratory striped bass Morone saxatilis in Plum Island Estuary (PIE), Massachusetts, we found that striped bass (335–634 mm total length) tagged in the spring and summer of 2005 (n = 14) and ...