摘要：Three strains of the rotifer Brachionus angularis Gosse collected respectively from localities near Qingdao, Guangzhou, and Wuhu cities were cultured at 25±1°C to compare their population growth and morphometric characteristics when their were fed different algal foods (Chlorella pyrenoidosa, Scenedesmus obliquus, or a 1:1 mixture of both algae). The population growth rate, body size, egg size, and relative egg size were all significantly affected by food type. Among the three types of food, the rotifers fed C. pyrenoidosa had the lowest population growth rate. Rotifers fed S. obliquus had larger body size and egg size than those fed C. pyrenoidosa. Among the three rotifer strains, the population growth rate and the body size of Wuhu strain was the lowest and largest, respectively, and the ratio of body width to body length of Wuhu strain was the smallest. There were significant relationships between body size and egg size in all three strains. With all three strains, larger bodied rotifers tended to produce larger clutches of eggs, and, except for the Qingdao strain, there was a positive correlation between clutch size and egg size. Eggs of the Qingdao strain were the largest at clutch size 3.
