【摘要】 以浓度分别为 3 0× 10 6、 6 0× 10 6、 9 0× 10 6和 12 0× 10 6cells/mL蛋白核小球藻 (Chlorellapyrenoi dosa)为食物 ,在温度为 (2 5± 1)℃下 ,应用群体累积培养法研究了食物浓度对分布于长江、珠江和淮河水系的 3个地理品系的角突臂尾轮虫 (Brachionusangularis)种群的增长、个体和卵的体积的影响。结果表明 ,食物浓度、地理品系及两者间的交互作用对轮虫种群增长率、个体和卵的体积均有显著影响。同一食物浓度下 ,广州品系的种群增长率最大 ,芜湖品系的个体和卵体积最大 ;同一品系中 ,当食物浓度为 9 0× 10 6cells/mL时轮虫有较大的种群增长率。各品系轮虫的种群增长率与食物浓度均呈曲线相关 ,但种群增长率达最大时所需的食物浓度在各品系间存在着差异。在食物浓度和品系两因素中 ,品系对轮虫个体体积有较大的影响更多还原

【Abstract】 By means of population accumulative culture and with a green algae Chlorella pyrenoidosa at four food levels (3.0×10 6,6.0×10 6,9.0×10 6 and 12.0×10 6?cells/mL),the effects of food concentration on the body and egg volume,and population growth in freshwater rotifers Brachionus angularis were studied at (25±1)?℃.The rotifers belong to Guangzhou,Wuhu and Yingshang strains collected from the water systems of Zhujiang River,Changjiang River and Huaihe River respectively.The results showed that the body and egg volume,and population growth were affected significantly by food concentration,strain and the interaction of both.At the same food level,the rotifer of Guangzhou strain had the largest population growth rate,and that of Wuhu strain had the largest body volume and egg volume.At the same strain,the population grew fastest while the food concentration was 9.0×10 6?cells/mL.The relationships between the food concentration and population growth rate were all curvilinear in three strains.However,the optimum food concentration for the population growth was different among them.The strain had a more important effect on the rotifer body volume than the food concentration did.更多还原