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Hydrobiologia

, Volume 563, Issue 1, pp 225–230 | Cite as

Morphological Response of Microcystis aeruginosa to Grazing by Different Sorts of Zooplankton

  • Zhou Yang
  • Fanxiang Kong
  • Xiaoli Shi
  • Huansheng Cao
Primary Research Paper

Abstract

In the experiment we investigated the effect of grazing by different sorts of zooplankton on the induction of defensive morphology in the cyanobacterium Microcystis aeruginosa. The results showed that protozoan flagellate Ochromonas sp. grazing could induce colony formation in M. aeruginosa, whereas M. aeruginosa populations in the control and the grazing treatments of copepod Eudiaptomus graciloides, cladoceran Daphnia magna, and rotifer Brachionus calyciflorus were still strongly dominated by unicells and paired cells and no colony forma occurred. In the protozoan grazing treatment, the proportion of unicells reduced from 83.2% to 15.7%, while the proportion of cells in colonial form increased from 0% to 68.7% of the population at the end of the experiment. The occurrence of a majority of colonial M. aeruginosa being in the treatment with flagellates, indicated that flagellate grazing on solitary cells could induce colony formation in M. aeruginosa. The colonies could effectively deter flagellate from further grazing and thus increase the survival of M. aeruginosa. The colony formation in M. aeruginosa may be considered as an inducible defense against flagellate grazing under the conditions that toxin cannot deter flagellate from grazing effectively.

Keywords

Microcystis aeruginosa zooplankton flagellate grazing colony formation inducible defense 

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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjingChina
  2. 2.Jiangsu Key Laboratory for Bioresource Technology, School of Biological SciencesNanjing Normal UniversityNanjingChina
  3. 3.Graduate School of the Chinese Academy of SciencesBeijingChina

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