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Free Content Functional response of the euphausiid Thysanoessa raschii grazing on small diatoms and toxic dinoflagellates

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The functional response of T. raschii feeding on monocultures of small phytoplankton at 0.4–14 g pigment liter–1 was determined using a time-series method in a large volume flow-through grazing system. A model-free robust regression procedure aided by graphical and statistical methods was used to compare Ivlev, Michaelis-Menten, linear, Disk equation and Holling type III models. Ivlev, Michaelis-Menten and Disk equation models were less preferable to a linear model because their parameters were highly correlated and could not be uniquely determined, although they appear to fit the data graphically. Holling type III model did not fit the data. A linear model both matched the model-free robust regression, and avoided problems of correlated parameters. No feeding threshold was detectable for the range of concentrations examined. T. raschii ingested the diatom Chaetoceros gracilis and both toxic and nontoxic clones of the dinoflagellate Gonyaulax tamarensis at the same rate at low concentrations (0.4–1.6 g pigment liter–1).

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Document Type: Research Article

Publication date: August 1, 1988

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  • The Journal of Marine Research, one of the oldest journals in American marine science, publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. Biological studies involving coupling between ecological and physical processes are preferred over those that report systematics. The editors strive always to serve authors and readers in the academic oceanographic community by publishing papers vital to the marine research in the long and rich tradition of the Sears Foundation for Marine Research. We welcome you to the Journal of Marine Research.
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