摘 要 ：报道了不同温度、盐度和饵料条件下西藏拟溞的摄食强度、西藏拟溞对不同饵料生物蛋白核小球藻(Chlorella pyrenoidesa)、牟氏角毛藻(Chaetoceros muelleri)、湛江等鞭金藻(Isochrysis zhanjiangensis)、亚心形扁藻(Platymonas subcordiformis)、盐藻(Dunaliella salina)、新月拟菱形藻（Nitzschiella closterium）的选择性以及摄食节律。结果表明，在适温范围（2-20℃）内，西藏拟溞的滤水率、摄食率随着温度的升高而增加，14-16℃为西藏拟溞的适宜温度。在盐度20时，西藏拟溞的摄食率最高，幼、成溞对等鞭金藻的摄食率分别为1.88 ng C/(ind?h)和3.46 ng C/(ind?h)。西藏拟溞对角毛藻的滤水率和摄食率均随着龄期增加而增加，而对等鞭金藻呈相反趋势，但二者的日粮均随体长增大而减小。幼、成溞的滤水率和摄食率随食物密度变化的趋势基本一致，均是在盐藻密度为1×106 ind./L时均最高，分别为0.194、0.221 mL/(ind?h)和0.030μgC/(ind?h)和0.034μgC/(ind?h)。幼溞对6种藻的食物选择性为角毛藻>小球藻>盐藻>扁藻>金藻>拟菱形藻；成溞为扁藻>角毛藻>盐藻>金藻>小球藻>拟菱形藻。幼溞、成溞均对角毛藻和盐藻的选择性较好。西藏拟溞的幼溞和成溞对牟氏角毛藻的摄食有相同的节律，在15：00-17：00和01:00-03:00时有两个摄食高峰，在09：00-11：00和23：00-01：00有两个低谷。
Abstract:A direct counting method was used to investigate the feeding intensity, feeding rhythms, and food selectivity to Chlorella pyernoidesa, Chaetoceros muelleri, Isochrysis zhanjiangensis, Platymonas subcordiformis, Dunaliella salina, Nitzschiella closterium of Daphniopsis tibetana maintained under different temperature, salinity and food. The results showed that the filtration rate and grazing rate of D. tibetana increased with the increase of temperature in range of 2-20℃, and reached highest values at 14-16℃. The highest grazing rates, 1.88 and 3.46 ngC/(ind?h) were obtained for the larvae and adults, respectively, fed on I. zhanjiangensis at the salinity of 20. The filtration rate and grazing rate of D. tibetama fed on C. muelleri increased with the increase of instar, while opposite trend existed for those fed on I. zhanjiangensis. The ration of D. tibetama fed both on C. muelleri and I. zhanjiangensis decreased with the increase of body length. The filtration rate and grazing rate of larvae and adults showed similar trends which changed with food concentration; Both larvae and adults fed on D. salina with the concentration of 1×106 ind./L had the highest filtration rate and grazing rate, i.e. 0194,0.221 mL/(ind?h) and 0.030, 0.034 gC/(ind?h), respectively. The food selectivity of larvae to six species of algae were C. muelleri >C. pyrenoidesa> D. salina> P. subcordiformis>I. zhanjiangensis > N. closterium, while that of adults were P. subcordiformis> C. muelleri>D. salina>I. zhanjiangensis >C. pyrenidesa > N. closterium. For both larvae and adults, food selectivity to C. muelleri and D. salina had better.than that to the other micro algae. Similar feeding rhythms existed in larval and adult D. tibetama fed on C. muelleri, of which there were two high feeding peaks at 15:00-17:00 and 01:00-03:00, as well as two low feeding valleys at 09:00-11:00 and 23:00-01:00.