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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摘要

以广东省流溪河水库中分离驯化的透明溞为研究对象,通过喂养来自富营养化湖泊(暨南大学明湖)的自然食物,探讨富营养化水体中的食物对透明溞生长与繁殖的影响。来自明湖的4种自然食物分别由2个网孔为38μm和110μm的浮游生物网过滤所得的,并将这2种过滤水稀释3倍后得到另外2种食物。在4种明湖自然食物培养条件下,透明溞最大体长、体长生长率和寿命均随食物浓度的稀释而下降,最大体长为2.63mm,最高体长生长率为0.0314mm·d^-1,最长寿命为65d。稀释后食物培养的透明溞,首次怀卵个体体长为1.46mm,大于非稀释食物条件下首次怀卵个体体长1.28mm;在110μm过滤的非稀释食物条件下,内禀增长率达到最大值为0.42。本实验结果表明,冬季富营养水体中食物对透明溞生长与繁殖没有产生抑制作用,食物浓度对透明溞的生长与繁殖的影响高于食物大小的影响。

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	林娴
	韩博平

关键词 ：生长, 繁殖, 食物, 透明溞, 富营养化

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

收稿日期: 2006-04-25

Q178.1

基金资助:教育部博士点基金(20050559004)资助

引用本文:

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

链接本文:

http://www.ecolsci.com/CN/Y2006/V25/I2/116

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