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Grazer-induced defenses in Scenedesmus (Chlorococcales; Chlorophyceae): coenobium and spine formation

Lürling, M. and Beekman, W. (1999) Grazer-induced defenses in Scenedesmus (Chlorococcales; Chlorophyceae): coenobium and spine formation. Phycologia, 38, 368-376. ISSN 0031-8884.

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Three strains of the nonspiny Scenedesmus acutus Meyen, one strain of the nonspiny S. falcatus Chodat, and three strains of the spined Scenedesmus quadricauda (Turpin) Brebisson were cultured in standard medium and in medium containing filtered water from a culture of the grazer Daphnia. Nonspiny strains were examined to detect grazer-induced colony formation. Spine length was measured in spined strains. Strains varied considerably in their response to chemicals from Daphnia. Three nonspiny strains showed rapid formation of four- and eight- celled coenobia in the presence of Daphnia water, whereas all nonspiny cultures remained unicellular in standard medium. By contrast, no grazer-induced colony formation occurred in spined strains. One spined strain formed eight-celled coenobia both in the absence and the presence of Daphnia medium. No evidence for grazer-induced spine formation was found. Growth rates were not affected by Daphnia water in all strains, but differed among strains. The phenomenon of grazer-induced coenobium formation seems widespread, but not universal within Scenedesmus. [KEYWORDS: Phenotypic plasticity; green-algae; daphnia; infochemicals; morphology; growth; acutus]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10758
Deposited On:25 Nov 2011 01:00
Last Modified:15 Jan 2014 09:33

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