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Ambient fluid motions influence swimming and feeding by the ctenophore Mnemiopsis leidyi

Sutherland, Kelly R. and Costello, Jack H. and Colin, Sean P. and Dabiri, John O. (2014) Ambient fluid motions influence swimming and feeding by the ctenophore Mnemiopsis leidyi. Journal of Plankton Research, 36 (5). pp. 1310-1322. ISSN 0142-7873. http://resolver.caltech.edu/CaltechAUTHORS:20141020-070313021

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Abstract

Planktonic organisms are exposed to turbulent water motion that affects the fundamental activities of swimming and feeding. The goal of this study was to measure the influence of realistic turbulence levels on (i) swimming behavior and (ii) fluid interactions during feeding by the lobate ctenophore, Mnemiopsis leidyi, a highly successful suspension-feeding predator. A laboratory turbulence generator produced turbulence (ε = 0.5–1.4 × 10^(−6) W kg^(−1)) representative of a field site in Woods Hole, MA, USA. Compared with still water, M. leidyi avoided regions in the experimental vessel where turbulence was greatest (ε = 1.1–1.4 × 10^(−6) W kg^(−1)) by increasing its swimming speeds and accelerations. Both laboratory and in situ particle image velocimetry data demonstrated that feeding currents of M. leidyi were eroded by ambient fluid motions. Despite this, the overall flux to the feeding structures remained constant due to higher swimming speeds in turbulent conditions. Instantaneous shear deformation rates produced by background turbulence were higher than those produced by ctenophore feeding currents and frequently exceeded the published escape thresholds of copepod prey. Feeding current erosion and fluid mechanical signal noise within turbulent flows affect the mechanics of predator–prey interactions during suspension feeding by the ctenophore M. leidyi.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://plankt.oxfordjournals.org/content/36/5/1310.abstractPublisherArticle
http://dx.doi.org/10.1093/plankt/fbu051DOIArticle
Additional Information:© The Author 2014. Published by Oxford University Press. Received January 3, 2014; accepted May 15, 2014. Corresponding editor: Roger Harris. Comments from two anonymous reviewers strengthened the manuscript. We thank Cornelia Jaspers for help with ADV sampling and Jeremy de Jong for providing Matlab code for calculating dissipation rates. This research was supported by the National Science Foundation (OCE-1061353 to J.H.C., S.P.C., J.O.D.; OCE-1155084 to K.R.S.) and the Office of Naval Research (N000141010137 to J.O.D., N000140810654 to J.H.C.).
Funders:
Funding AgencyGrant Number
NSFOCE-1061353
NSFOCE-1155084
Office of Naval Research (ONR)N000141010137
Office of Naval Research (ONR)N000140810654
Subject Keywords:Mnemiopsis leidyi turbulence swimming behavior suspension feeding
Record Number:CaltechAUTHORS:20141020-070313021
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141020-070313021
Official Citation:Kelly R. Sutherland, Jack H. Costello, Sean P. Colin, and John O. Dabiri Ambient fluid motions influence swimming and feeding by the ctenophore Mnemiopsis leidyi J. Plankton Res. (September/October 2014) 36 (5): 1310-1322 first published online June 12, 2014 doi:10.1093/plankt/fbu051
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50519
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Oct 2014 15:25
Last Modified:20 Oct 2014 15:25

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