Effect of temperature and food concentration on the population dynamics of three Brachionus calyciflorus strains

Abstract

Abstract: Effects of temperature (20 ℃,25 ℃,30 ℃) and food concentration (1.5,3.0,6.0,9.0×10⁶ cells·ml^-1) on the population dynamics of Brachionus calyciflorus of Qingdao,Wuhu and Guangzhou strains were studied by means of individual culture.The result showed that the temperature was an important factor affecting generation time and intrinsic rate of population increase.With rising of temperature,the intrinsic rate of population increase increased,but generation time decreased.There were significant effects of food concentration on life expectancy and average lifespan.The effect of strain on net reproductive rate,generation time,life expectancy and average lifespan was also significant.Net reproductive rate,generation time,life expectancy,and average lifespan of Guangzhou strain was all the maximum,and that of Wuhu strain minimum among the three strains.The rotifers fed on the algae at the concentration of 3.0×10⁶ cells·ml^-1 had the longest life expectancy and average lifespan,but those at 9.0×10⁶ cells·ml^-1 had the shortest.Net reproductive rate,generation time,gross reproductive rate,life expectancy,and average lifespan of the three strains decreased linearly with the rise of temperature,except for the net reproductive rate of Guangzhou strain,while the intrinsic rate of population increase of all the three strains and gross reproductive rate of Guangzhou strain increased linearly with the rise of temperature.The relationships between all the life history parameters of Qingdao and Guangzhou strains and food concentration were all curvilinear,however,those between generation time,average lifespan,and life expectancy of Wuhu strain and food concentration could all be described by linear regression.

Key words: Brachionus calyciflorus, Strain, Temperature, Food concentration, Life history parameter

CLC Number:

Q959.181

DONG Lili, XI Yilong, LIU Guiyun, CHEN Fang, GE Yali, WEN Xinli. Effect of temperature and food concentration on the population dynamics of three Brachionus calyciflorus strains[J]. Chinese Journal of Applied Ecology, 2004, (11): 2165-2169.

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