@article {Hansen3237,
author = {Hansen, B. W. and Jakobsen, H. H. and Andersen, A. and Almeda, R. and Pedersen, T. M. and Christensen, A. M. and Nilsson, B.},
title = {Swimming behavior and prey retention of the polychaete larvae Polydora ciliata (Johnston)},
volume = {213},
number = {18},
pages = {3237--3246},
year = {2010},
doi = {10.1242/jeb.038810},
publisher = {The Company of Biologists Ltd},
abstract = {The behavior of the ubiquitous estuarine planktotrophic spionid polychaete larvae Polydora ciliata was studied. We describe ontogenetic changes in morphology, swimming speed and feeding rates and have developed a simple swimming model using low Reynolds number hydrodynamics. In the model we assumed that the ciliary swimming apparatus is primarily composed of the prototroch and secondarily by the telotroch. The model predicted swimming speeds and feeding rates that corresponded well with the measured speeds and rates. Applying empirical data to the model, we were able to explain the profound decrease in specific feeding rates and the observed increase in the difference between upward and downward swimming speeds with larval size. We estimated a critical larval length above which the buoyancy-corrected weight of the larva exceeds the propulsion force generated by the ciliary swimming apparatus and thus forces the larva to the bottom. This modeled critical larval length corresponded to approximately 1 mm, at which, according to the literature, competence for metamorphosis and no more length increase is observed. These findings may have general implications for all planktivorous polychaete larvae that feed without trailing threads. We observed bell shaped particle retention spectra with a minimum prey size of approximately 4 μm equivalent spherical diameter, and we found that an ontogenetic increase in maximum prey size add to a reduction in intra-specific food competition in the various larval stages. In a grazing experiment using natural seawater, ciliates were cleared approximately 50\% more efficiently than similar sized dinoflagellates. The prey sizes retainable for P. ciliata larvae covers the microplankton fraction and includes non-motile as well as motile prey items, which is why the larvae are trophically positioned among the copepods and dinoflagellates. Not only do larval morphology and behavior govern larval feeding, prey behavior also influences the feeding efficiency of Polydora ciliata. alarva model, polar radius (mm)blarva model, equatorial radius (mm)clarva model, geometric parameter (mm)CDdrag coefficient (dimensionless)CFpropulsion force coefficient (dimensionless)dlarva diameter (mm)dmaxmaximum larva diameter (mm)Ddrag (nN)Fpropulsion force (nN)gacceleration due to gravity (m s{\textendash}2)maximum ingestion rate (cell larva{\textendash}1 day{\textendash}1)llarva length (mm)lcprototrochal cilia length (mm)lmaxmaximum larva length (mm)m'buoyancy-corrected mass of larva (kg)maximum clearance rate (ml larva{\textendash}1 day{\textendash}1Ueffective speed of the beating cilia (m s{\textendash}1)Vswimming speed, horizontal (mm s{\textendash}1)Vdownswimming speed, downward (mm s{\textendash}1)Vupswimming speed, upward (mm s{\textendash}1)αprototroch, geometric parameter (dimensionless)ηdynamic viscosity (Pa s)ρdensity of water (kg m{\textendash}3)ρsaverage density of larva (kg m{\textendash}3)τ0larva model, geometric parameter (dimensionless)},
issn = {0022-0949},
URL = {http://jeb.biologists.org/content/213/18/3237},
eprint = {http://jeb.biologists.org/content/213/18/3237.full.pdf},
journal = {Journal of Experimental Biology}
}