【摘要】 实验研究了强壮箭虫对几种食物的摄食选择性和几种生态因子对其摄食率的影响,以及摄食的昼夜节律。结果表明,强壮箭虫首先选食蒙古裸腹,其次哲水蚤,再其次猛水蚤,不摄食褶皱臂尾轮虫。食物密度、温度和盐度对其摄食率均有极显著的影响,其关系式分别为(1)Y=-0.0394X2+1.5861X-4.0500(R2=0.9235),(2)Y=-0.0514X2+1.3238X+7.3833(R2=0.9510),(3)Y=-0.0275X2+1.3992X-6.3571(R2=0.9041)。摄食的最适食物密度为每升100个裸腹(生物量15~20mg.L-1),摄食率为11.9ind.d-1;摄食的最适水温为12.9℃,摄食率15.9ind.d-1;摄食的最适盐度为25.4,摄食率为11.4ind.d-1。强壮箭虫在夜间或弱光条件下,摄食较为强烈,早晨8点到12点摄食率最低,午后4点到8点达到摄食高峰。更多还原

【Abstract】 The feeding selectivity of Sagitta crassa,some ecological factors effect to the feeding rate and their diurnal feeding rhythm were experimentally studied in this paper.From the results,Sagitta crassa choose Moina mongolica first,second is Calanida,third comes Harpacticoide and never feed on Brachionus plicatilis.There were significant effects of food density.temperature and salinity on the feeding rate of Sagitta crassa.The relational formulas respectively are（1）Y=-0.0394X²+1.5861X-4.0500（R²=0.9235）（2）Y=0.0514X²+1.3238X+7.3833（R²=0.9510）,（3）Y=-0.0275X²+1.3992X-6.3571（R²=0.9041）.The optimum food dencity for feeding was 100 ind·L^-1 Moina(15～20 mg·L^-1 biomass) In which the feeding rate was 11.9 ind·d^-1 Moina.The optimum temperature of water for feeding was 12.9 ℃ in which the feeding rate was 15.9 ind·d^-1 Moina.The optimum salinity for feeding was 25.4S in which the feeing rate was 11.4 ind·d^-1 Moina.There was more intense grazing behaviors of Sagitta crassa at night or slight light.The feeding rate of Sagitta crassa were minimum 8:00-12:00 and maximum 16:00-20:00.更多还原