食物种类和浓度对红臂尾轮虫种群增长、个体大小及卵大小的影响

Effects of food component and concentration on population growth, body size, and egg size of freshwater rotifer Brachionus rubens

采用群体累积培养法 ,研究了藻类食物的种类和浓度对红臂尾轮虫种群增长、个体大小及卵大小的影响 .结果表明 ,藻种类和浓度对红臂尾轮虫种群增长率、个体体积及卵体积均有极显著影响 .不同食物种类中 ,种群增长率以小球藻组最小 ,栅藻组最大 ;个体体积以小球藻组最小 ,栅藻组和混合藻组间无显著差异 .种群增长率 (Y ,d-1)与食物浓度 (X ,× 10 6cells·ml-1)间呈曲线相关 ,两者间的关系符合方程 :Y=- 0 .0 0 4 0X2 +0 .0 4 0 9X +0 .4 4 71.在所研究的食物浓度范围内 ,当浓度分别高于或低于 6 .0× 10 6cells·ml-1和 3.0× 10 6cells·ml-1时 ,轮虫个体体积和卵体积均分别呈减小的趋势 .

The effects of food component and concentration on the population growth, body size, and egg size of freshwater rotifer Brachionus rubens were studied using population accumulative culture method. The results showed that there were very significant effects of food component and concentration on the population growth rate, body volume and egg volume. Among three types of algal food, the population growth rate of rotifers fed with Chlorella pyrenoidosa was lowest,and that fed with Scenedesmus obliquus was the highest. Rotifers fed with C.pyrenoidosa had the smallest body volume, but there were no significant difference between the two others. The relationship between population growth rate and food concentrations was curvilinear, and it could be described as Y=-0.0040X 2+0.0409X +0.4471.The body and egg volumes tended to be smaller,when the food concentrations were higher than 6.0×10 6cells·ml -1 and or lower than 3.0×10 6cells·ml -1 .