微囊藻和栅列藻的垂直迁移及生态学意义

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Abstract

The vertical migration of cell of two algal species (Microcystis aeroginosa and Scenedesmus obliquus), represented by attenuation coefficient (K) and sinking velocity (V), was studied in self-made sinking column. Results showed that the property in vertical migration of these two species were different in 4 irradiation intensities and 3 growth phases. For Scenedesmus obliquus colony, the K_min is -0.0021 cm^-1 (migrating upward) and the K_max is 0.0065 cm^-1 (sinking downward),and the value of relative parameter is-0.0029 cm^-1and 0.0036 cm^-1 for Microcystis colony respectively. Most values of R² of exponential simulation was more than 0.6, which showed R² can reflect the property of cell sinking and the variation of cell density according to depth exponentially. The maxim of sinking velocity (V_max), 4.681cm·h^-1 (downward), was obtained in Scenedesmus colony in exponential phase, and the V_min of migration velocity,-1.790 cm·h^-1 (upward) was present in stable phase of Microcystis colony. The data gained in this study may be a direct evidence to explain the mechanism of population domination of Microcystis spp.

Key words： Microcystis aeroginosa Scenedesmus obliquus Vertical migration

Received: 25 June 2004

PACS:

Q949.2

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	Wu Shengcai
	Chen weimin

Cite this article:

Wu Shengcai,Chen weimin. Vertical migration of Microcystis and Scenedesmus and its ecological significance[J]. , 2004, 23(3): 244-248.

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http://journal15.magtechjournal.com/Jwk_stkx/EN/ OR http://journal15.magtechjournal.com/Jwk_stkx/EN/Y2004/V23/I3/244

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