敌百虫对中肋骨条藻生长的影响

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Abstract

The effects of trichlorfon, an organophosphorus pesticide, on the growth of Skeletonema costatum were studied under laboratory conditions. The 72 h EC₅₀ value of trichlorfon to S. costatum was 84.8 mg/L, which was far lower than that to aquatic crustaceans and fishes. The growth of S. costatum at the low concentration of trichlorfon (less than 10 mg/L) was similar to that in the control group during the 31 d chronic exposure. The growth was significantly inhibited by trichlorfon at the concentration of 50 mg/L for the first 14 d exposure; however the cell numbers kept on increasing after 15 d exposure when those in the other treatments declined. The maximum cell density in this group was up to 2.77×10⁷ cells/mL, which was 137.7% of the control group. The growth at 100 mg/L was completely inhibited. The results suggested that the wide use of the organophosphorus pesticides such as trichlorfon would stimulate the growth of phytoplankton, and thus increase the rick of algal blooms.

Key words： trichlorfon Skeletonema costatum growth toxicity

Received: 25 April 2013

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	Articles by authors
	LIANG Ju-fang
	WANG Zhao-hui
	LIN Lang-cong

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LIANG Ju-fang,WANG Zhao-hui,LIN Lang-cong. Effects of trichlorfon on the growth of marine microalga Skeletanema costatum[J]. , 2013, 32(2): 230-234.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2013/V32/I2/230

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