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Environ Microbiol


Title:Temporary cyst formation in phytoplankton: a response to allelopathic competitors?
Author(s):Fistarol GO; Legrand C; Rengefors K; Graneli E;
Address:"Division of Marine Science, Department of Biology and Environmental Sciences, University of Kalmar, S 392 31 Kalmar, Sweden. giovana.salomon@hik.se"
Journal Title:Environ Microbiol
Year:2004
Volume:6
Issue:8
Page Number:791 - 798
DOI: 10.1111/j.1462-2920.2004.00609.x
ISSN/ISBN:1462-2912 (Print) 1462-2912 (Linking)
Abstract:"Competition among phytoplankton for limiting resources may involve direct or indirect interactions. A direct interaction of competitors is the release of chemicals that inhibit other species, a process known as allelopathy. Here, we investigated the allelopathic effect of three toxic microalgae species (Alexandrium tamarense, Karenia mikimotoi and Chrysochromulina polylepis) on a natural population of the dinoflagellate Scrippsiella trochoidea. Our major findings were that in addition to causing death of S. trochoidea cells, the allelopathic species also induced the formation of temporary cysts in S. trochoidea. Because cysts were not lysed, encystment may act as a defence mechanism for S. trochoidea to resist allelochemicals, especially when the allelopathic effect is moderate. By forming temporary cysts, S. trochoidea may be able to overcome the effect of allelochemicals, and thereby have an adaptive advantage over other organisms unable to do so"
Keywords:"Adaptation, Physiological Animals Dinoflagellida/cytology/*drug effects/growth & development/*metabolism Ecosystem Growth Inhibitors/pharmacology Pheromones/*pharmacology Phytoplankton/cytology/*drug effects/growth & development/*metabolism Seawater;"
Notes:"MedlineFistarol, Giovana O Legrand, Catherine Rengefors, Karin Graneli, Edna eng Research Support, Non-U.S. Gov't England 2004/07/15 Environ Microbiol. 2004 Aug; 6(8):791-8. doi: 10.1111/j.1462-2920.2004.00609.x"

 
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