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The freshwater chlorophyte Scenedesmus obliquus (Turpin) Kützing produces colonies as an inducible defence against herbivores. We investigated the dynamics of Scenedesmus colony formation and disintegration in response to the density of the herbivorous rotifer Brachionus calyciflorus in large-scale mesocosms. Additional bioassays were performed to investigate Scenedesmus colony disintegration under different light regimes. In the mesocosm experiment, colony formation took place rapidly, but relaxation towards the initial size took relatively long (>10 d) after cessation of herbivory. In the bioassays, in the absence of infochemicals, colonies disintegrated almost immediately in the dark (1-1.5 d), within 4 d under a photoperiod of 16:8 (L:D) and between 8 and 12 days under full light. Colony disintegration times in the mesocosm experiment were substantially longer as compared to treatments with the same photoperiod (L:D 16:8) in the bioassays. So after a peak of herbivory, the 'ghost of herbivory past', i.e. the remaining infochemicals, may continue to induce colony formation, causing an additional lengthening of colony disintegration times and associated fitness costs (higher sedimentation loss rates). This indicates that costs of colony formation are not only important during the induction phase, but may be even more important during the relaxation phase. We compared these sedimentation costs to the costs of herbivory for differently sized Scenedesmus, and found a clear trade-off pattern for these costs. VERSCHOOR, Antonie M., Ozan K. BEKMEZCI, Ellen VAN DONK, and Jacobus VIJVERBERG. 2009. “The Ghost of Herbivory Past: Slow Defence Relaxation in the Chlorophyte Scenedesmus Obliquus”. Journal of Limnology 68 (2):327-35. https://doi.org/10.4081/jlimnol.2009.327. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations List of Cited By : Grazing resistance in phytoplankton Miquel Lürling Hydrobiologia : 2021 Grazer-induced morphological defense in Scenedesmus obliquus is affected by competition against Microcystis aeruginosa Xuexia Zhu, Jun Wang, Yichun Lu, Qinwen Chen, Zhou Yang Scientific Reports : 2015 The costs and benefits of multicellular group formation in algae* Stefania E. Kapsetaki, Stuart A. West Evolution : 2019 Application of Microalgae in Wastewater Treatment Roxana Ángeles, Rosario Rodero, Andrea Carvajal, Raúl Muñoz, Raquel Lebrero Elevated CO2 concentrations affect the elemental stoichiometry and species composition of an experimental phytoplankton community ANTONIE M. VERSCHOOR, MARK A. VAN DIJK, JEF HUISMAN, ELLEN VAN DONK Freshwater Biology : 2013 Zooplankton community influence on seasonal performance and microalgal dominance in wastewater treatment High Rate Algal Ponds Valerio Montemezzani, Ian C. Duggan, Ian D. Hogg, Rupert J. Craggs Algal Research : 2016 Waterborne copper impairs grazer-induced colony formation and photosynthetic efficiency inScenedesmus obliquus Yuan Huang, Haihong Nan, Xuexia Zhu, Bangping Li, Zeng Zhang, Zhou Yang Limnology and Oceanography : 2016 A review of potential methods for zooplankton control in wastewater treatment High Rate Algal Ponds and algal production raceways Valerio Montemezzani, Ian C. Duggan, Ian D. Hogg, Rupert J. Craggs Algal Research : 2015 Intraspecific chemical communication in microalgae Marianna Venuleo, John A. 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Registered in print in Verbania, 7-10-1959, n. 58.

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