富营养化水体中自然食物对透明溞(Daphnia hyalina)生长与繁殖影响的初步实验

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Abstract

A laboratory experiment was carried out to evaluate effects of food from a eutrophic lake on the growth and reproduction of Daphnia hyalina from Liuxihe Reservoir(E:113°46', N:23°45'). The food was natural sestons from Minghu Lake, a eutrophic lake located in Jinan University, Guangzhou. The natural sestons from Minghu Lake were got by filtering with 38μm and 110μm mesh, and then diluted the two types of natural sestons with water filtered with 0.45μm mesh to get the other two kinds of food. The longest body length, the somatic growth rate and lifespan decreased as the natural sestons was diluted. D. hyalina had the longest body length of 2.63mm and the highest somatic growth rate of 0.0314 mm·d^-1 under the sestons filtered with 110μm mesh. The longest lifespan of 65 days under the sestons filtered with 38μm mesh. Under the natural sestons after dilution, the zooplankton has a body length at maturity of 1.46 mm, longer than that under natural sestons without dilution. The highest intrinsic rate of increase was 0.42 at the natural sestons filtered with 110μm mesh without dilution. Food concentration, rather than food size, appeared to influence more importantly the growth and reproduction of Daphnia hyalina. The experiment revealed that the food from the eutrophic lake in the winter did not inhibit the growth and reproduction of Daphnia hyalina.

Key words： Growth Reproduction Food Daphnia hyalina

Received: 25 April 2006

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	LIN Xian
	HAN Bo-ping

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LIN Xian,HAN Bo-ping. The effect of food from a eutrophic lake on the growth and reproduction of Daphnia hyalina[J]. , 2006, 25(2): 116-121.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2006/V25/I2/116

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