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Grazing in a turbulent environment: Behavioral response of a calanoid copepod, Centropages hamatus

Costello, John H. and Strickler, J. Rudi and Marrasé, Celia and Trager, Geoff and Zeller, Robert and Freise, Amy J. (1990) Grazing in a turbulent environment: Behavioral response of a calanoid copepod, Centropages hamatus. Proceedings of the National Academy of Sciences of the United States of America, 87 (5). pp. 1648-1652. ISSN 0027-8424. https://resolver.caltech.edu/CaltechAUTHORS:20150113-145929178

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Abstract

Models of marine ecosystem productivity rely on estimates of small-scale interactions, particularly those between copepods and their algal food sources. Rothschild and Osborn [Rothschild, B. J. & Osborn, T. R. (1988) J. Plankton Res. 10, 465-474], hypothesized that small-scale turbulence in aquatic systems increases the perceived abundance of prey to predators. We tested this hypothesis by exposing the planktonic copepod Centropages hamatus to turbulent and nonturbulent environments at different prey concentrations. Our results fell into two main categories. First, the response to turbulence was characterized by an initial period having a high number of escape reactions. This period was followed by one of increased foraging. C. hamatus responded to the higher encounter rates due to turbulence as if it were experiencing altered prey concentrations. Second, the termination of turbulence resulted in an increased foraging response, which was not directly related to the encounter rate. Functional response curves do not adequately explain this foraging response because the time course of the foraging response depends on prior encounter experience and foraging motivation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1073/pnas.87.5.1648DOIArticle
http://www.pnas.org/content/87/5/1648PublisherArticle
Additional Information:© 1990 National Academy of Sciences. Communicated by A. A. Benson, October 16, 1989. The authors thank W. Lange and E. Saiz for technical assistance, and J. T. Turner, T. Granata, S. Richman, and two anonymous reviewers for their comments on the manuscript. This research was supported by National Science Foundation Grants OCE-8416261 and OCE-8719984 to J.R.S. C.M. was supported by a Fulbright Fellowship. The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.
Funders:
Funding AgencyGrant Number
NSFOCE-8416261
NSFOCE-8719984
Fulbright FellowshipUNSPECIFIED
Subject Keywords:encounter rate; feeding; functional response
Issue or Number:5
Record Number:CaltechAUTHORS:20150113-145929178
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150113-145929178
Official Citation:Costello, J. H., Strickler, J. R., Marrasé, C., Trager, G., Zeller, R., & Freise, A. J. (1990). Grazing in a turbulent environment: behavioral response of a calanoid copepod, Centropages hamatus. Proceedings of the National Academy of Sciences, 87(5), 1648-1652.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53640
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:13 Jan 2015 23:21
Last Modified:03 Oct 2019 07:51

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