球形棕囊藻囊体形成中光照、营养盐和共存硅藻的影响

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Abstract

Phaeocystis globosa and three diatom species were grown in semi-continuous culture in order to investigate the effects of irradiance, N:P supply ratio and the competition from coexisting diatoms on the colony formation of P. globosa. Experiments were conducted with two light regimes under N- and P-limited conditions. The results showed that high light increased the growth of all species of phytoplankton, and that higher phytoplankton biomass was observed in the N-limitation culture. Due to their smaller cell volume, Skeletonema costatum and P. globosa solitary cells possessed higher competition relative to Thalassiosira weissflogii and Chaetoceros curvisetus. P. globosa failed to form colonies under low light conditions. Nitrate was the favored nitrogen source for the development of colonies, however the architecture of colonies was not affected by different N:P supply ratio. The life cycle transformations permitted P. globosa to survive when light and nutrient became limited, partly explaining the mechanisms that P. globosa blooms occurred after diatom blooms along the coasts.

Key words： Phaeocystis globosa diatoms light limitation nutrient limitation

Received: 25 April 2013

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	WANG Yan
	DENG Kun
	WANG Xiao-dong

Cite this article:

WANG Yan,DENG Kun,WANG Xiao-dong. The effects of light, nutrient and co-existing diatom on colony formation of Phaeocystis globosa[J]. , 2013, 32(2): 165-170.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2013/V32/I2/165

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