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Benefits and costs of the grazer-induced colony formation in Microcystis aeruginosa

Published online by Cambridge University Press:  21 August 2009

Zhen Yang ,
Fanxiang Kong ,
Zhou Yang ,
Min Zhang ,
Yang Yu  and
Shanqin Qian
Zhen Yang
Affiliation:
State Key Laboratory of Lake Science Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing, China Graduate School of the Chinese Academy of Sciences, 100039 Beijing, China
Fanxiang Kong*
Affiliation:
State Key Laboratory of Lake Science Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing, China
Zhou Yang
Affiliation:
Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, 210046 Nanjing, China
Min Zhang
Affiliation:
State Key Laboratory of Lake Science Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing, China
Yang Yu
Affiliation:
State Key Laboratory of Lake Science Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing, China
Shanqin Qian
Affiliation:
State Key Laboratory of Lake Science Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing, China Graduate School of the Chinese Academy of Sciences, 100039 Beijing, China
*
fxkong@niglas.ac.cn
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Abstract

Colonial Microcystis aeruginosa were obtained when the unicellular algae were exposed to flagellate Ochromonas sp. filtrate. To investigate the benefit of this morphological change, flagellates were added into cultures of unicellular and colonial M. aeruginosa, respectively. The clearance rates of flagellates on algae were markedly decreased when they were cultivated with induced colonial M. aeruginosa. This result indicated that colony formation in M. aeruginosa was a predator-induced defense, which could reduce predation risk from flagellate. The increased content of soluble extracellular polysaccharide (sEPS) and bound extracellular polysaccharide (bEPS) may play an important role in adhering M. aeruginosa cells together to form colonies. The decrease of ΦPS II and the increase of sinking rates of induced colonial M. aeruginosa showed that the costs of grazed-induced colony formation in M. aeruginosa may reflect in the photosystem II efficiency, and in the sinking rates.

Keywords

Morphological plasticityOchromonas sp.clearance ratesinking ratepolysaccharide
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 45 , Issue 3 , 2009 , pp. 203 - 208
Copyright
© EDP Sciences, 2009

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