食物浓度对萼花臂尾轮虫混交雌体形成的影响  

EFFECT OF FOOD CONCENTRATION ON THE INITIATION OF MICTIC FEMALES OF THE BRACHIONUS CALYCIFLORUS POPULATIONS(ROTIFERA)

作　　者：陈芳[1] 席贻龙[1] 徐晓平[1] 

机构地区：[1]安徽师范大学生命科学学院,安徽芜湖241000

出　　处：《安徽师范大学学报（自然科学版）》2005年第4期451-455,共5页Journal of Anhui Normal University(Natural Science)

基　　金：国家自然科学基金(30270221);安徽省优秀青年基金(04043050);安徽省自然科学基金(00042416)

摘　　要：运用群体培养法,研究了藻类食物浓度对萼花臂尾轮虫混交雌体形成的影响.结果表明,当食物浓度为2.0×106cells/mL时,产雄卵的混交雌体、雄体和产休眠卵的雌体的出现时间分别为第0.5、1.5和2天;当食物浓度为5.0×106cells/mL时分别为第0.5、1.5和3天;当食物浓度为8.0×106cells/mL时则分别为第0.5、1和1.5天.在10天的培养过程中,非混交雌体和产雄卵的混交雌体的平均密度和生产量均在食物浓度为8.0×106cells/mL时最高,食物浓度为2.0×106cells/mL和5.0×106cells/mL之间无显著差异;产休眠卵的混交雌体的平均密度和生产量以食物浓度2.0×106cells/mL时最低,其余二浓度间无显著差异;雄体的平均密度和生产量在各食物浓度下无显著差异.雄体生产量和总雌体生产量的比值以食物浓度为2.0×106cells/mL时最大,其余两浓度间无显著差异.当食物浓度为8.0×106cells/mL时种群中的平均混交雌体百分率最低;2.0×106cells/mL和5.0×106cells/mL时较高,且两者间无显著差异.而平均混交雌体受精率则随食物浓度的升高而显著增大.The effects of food concentration on the initiation of mictic females of the B. calyciflorus populations were studied by means of population accumulative culture. The results showed that when food concentration was 2.0 ×10^6cells/mL, the emerging times of male egg - producing mictic females, males and resting egg - producing mictic females were respectively 0.5, 1.5 and 2d; When food concentration was 5.0 × 10^6cells/mL, they were 0.5, 1.5 and 3d; And when food concentration was 8.0 × 10^6cells/mL, they were 0.5, 1, and 1.5d. During the culture time of 10d, the mean density and the production of amictic females and male egg-producing mictic females were both the highest at the food concentration of 8.0 × 10^6cells/mL, while no significant differences appeared between 2.0 × 10^6cells/mL and 5.0 × 10^6cells/mL groups; The mean density and the production of resting egg-producing mictic females appeared to be the lowest at 2.0 × 10^6cells/mL, with no significant differences between the other two food concentrations; No significant differences among food concentrations in the mean density and the production of males were observed. The M/T ratio reached its maximum at 2.0 × 10^6cells/ mL, with no significant difference between the other two food concentrations. The mean mixis rate at 8.0 × 10^6cells/mL was the lowest, while at 2.0 × 10^6cells/mL and 5.0 × 10^6cells/mL they were higher. The mean fertilization rate increased when food concentration was higher.

关 键 词：萼花臂尾轮虫 食物浓度 混交雌体百分率 

分 类 号：Q958.8[生物学—动物学]