Effects of Brachionus calyciflorus culture media filtrate on Microcystis aeruginosa,Scenedesmus obliquus and Chlorella vulgaris colony formation and growth

Abstract

Abstract: To examine the possible information transfer by chemicals between zooplankton and algae,this paper studied the effects of Brachionus calyciflorus culture media filtrate on the colony formation and growth of Microcystis aeruginosa,Scenedesmus obliquus and Chlorella vulgaris.The results showed that the test filtrate could significantly promote the colony formation and population growth of S.obliquus,while no significant effect was observed on M.aeruginosa and C.vulgaris.The induced colony formation of S.obliquus increased its resistance to grazing,and thus,reduced the risk of its being grazed,which could be viewed as a kind of inducing defense.The accelerated growth of C.vulgaris and the toxin production of M.aeruginosa could also be interpreted as a defense mechanism against grazing.It maybe concluded that M.aeruginosa,S.obliquus and C.vulgaris could adopt different ecological strategies to resist the potential grazing by rotifer B.calyciflorus,and thus,to keep their population on a certain scale.

Key words: Brachionus calyciflorus, Culture media filtrate, Colony formation, Growth, Microcystis aeruginosa, Scenedesmus obliquus, Chlorella vulgaris

CLC Number:

Q178.1

YANG Zhou, KONG Fanxiang, SHI Xiaoli, YANG Jiaxin . Effects of Brachionus calyciflorus culture media filtrate on Microcystis aeruginosa,Scenedesmus obliquus and Chlorella vulgaris colony formation and growth[J]. Chinese Journal of Applied Ecology, 2005, 16(6): 1138-1141.

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