【摘要】 在实验室内将蒙古裸腹按 0 0 6、0 10、0 30、0 6 0个·ml-1的密度与褶皱臂尾轮虫 (密度为 0 3个·ml-1)进行混合培养 ,同时按上述密度分别单种培养了蒙古裸腹和褶皱臂尾轮虫作为对照 .结果表明 ,蒙古裸腹与褶皱臂尾轮虫之间存在种间竞争 ,当二者共存时 ,褶皱臂尾轮虫对蒙古裸腹种群产生压制作用 ,使蒙古裸腹在混合培养体系中以很低的密度存在 ,而褶皱臂尾轮虫种群受蒙古裸腹影响不大 .通过进一步的饥饿实验发现 90 %的褶皱臂尾轮虫经过 14 4h饥饿后仍然存活 ,而经过 12 0h饥饿后的蒙古裸腹 10 0 %死亡 .褶皱臂尾轮虫耐饥饿能力较强是其在与蒙古裸腹竞争中获胜的原因之一 .更多还原

【Abstract】 In a laboratory experiment,Moina mongolica and Brachionus plicatilis were polycultured at four relatively inoculating densities,i.e.,0.06/0.30,0.10/0.30,0.30/0.30 and 0.60/0.30 (ind·ml -1/ind·ml -1),while M.mongolica monocultured at 0.06,0.10,0.30 and 0.60 ind·ml -1 and B.plicatilis at 0.30 ind·ml -1 were used as the control.Interspecific interference did exist between M.mongolica and B.plicatilis when these two species coexisted in a microcosm.In the polycultured microcosms,depressed population density of M.mongolica resulted from the coexistence of B.plicatilis,and M.mongolica maintained at extremely low density.In opposite,M.mongolica had negligibly negative influence on the population of B.plicatilis.Further experiment showed that the mortality of M.mongolica deprived of food for 120 h was 100%,while 90% of B.plicatilis survived after 144 h of food deprivation.The relatively strong capacity of B.plicatilis in tolerating starvation may be one of the important reasons for it wins the competition against M.mongolica.更多还原