Journal Article

Horizontal distribution of <i>Daphnia pulex</i> in response to toxic and non-toxic algal extracts

Camilla Laurén-Määttä, Ole Kleiven and Jari Kiviranta

in Journal of Plankton Research

Volume 19, issue 1, pages 141-148
Published in print January 1997 | ISSN: 0142-7873
Published online January 1997 | e-ISSN: 1464-3774 | DOI: https://dx.doi.org/10.1093/plankt/19.1.141
Horizontal distribution of Daphnia pulex in response to toxic and non-toxic algal extracts

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We studied the horizontal distribution of Daphnia pulex as a response to gradients of toxic extracts of two cyanobacteria, Microcystis aeruginosa and Oscillatoria agardhii and non-toxic extracts of the green alga Scenedesmus obtusiusculus. The experiment was performed in the dark using a flow through system with five chambers. Daphnia pulex aggregated at the inlet of Scenedesmus extract, but showed similar responses to extracts of toxic cyanobactena and food-free medium. Chemical cues seem to affect food search, but do not effect Daphnia pulex's avoidance of toxic algae.

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Subjects: Marine and Estuarine Biology ; Zoology and Animal Sciences

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