不同碳磷比的斜生栅藻(Scenedesmus obliquus)对同型溞(Daphnia similis)生长和繁殖的影响  

Effects of Scenedesmus obliquus with different C/P ratios on the growth and reproduction of Daphnia similis

作　　者：张慧[1,2] 蔡敏[1,2] 陈非洲[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,南京210008 [2]中国科学院大学,北京100049

出　　处：《湖泊科学》2017年第5期1188-1194,共7页Journal of Lake Sciences

基　　金：国家自然科学基金项目(41271523;31670463)资助

摘　　要：食物质量会影响浮游动物的生长和繁殖,表征食物质量的指标包括食物大小、元素比、生物化学组成和毒性有无等.用斜生栅藻(Scenedesmus obliquus)的碳磷比(C/P)表征食物质量,分析不同C/P斜生栅藻对同型溞(Daphnia similis)生长和繁殖的影响.研究中4个处理组斜生栅藻C/P分别为881.8、512.3、124.3和42.4.培养9 d后不同处理组同型溞的生长速率分别为0.15、0.27、0.47和0.44 d-1.C/P比为881.8的处理组同型溞在整个培养过程中没有产仔,其余3个处理组的同型溞第1成龄期的产仔量分别为1.2±1.3、9.8±2.3和9.5±2.5 ind./female.结果表明,与斜生栅藻C/P为124.3处理条件相比,斜生栅藻C/P过高(512.3和881.8)及C/P过低(42.4)处理条件下同型溞生长速率和产仔量均降低.本研究表明食物C/P的高低会影响溞的生长和繁殖,从而影响其在湖泊中的生存.Food quality can influence the growth and reproduction of zooplankton in freshwater systems. Food size,element ratios,biochemical composition and toxicity are indicative of food quality. The C/P ratios of Scenedesmus obliquus was used to represent the food quality in this experiment. We analyzed the effects of S. obliquus with different C/P ratios on the growth and reproduction of Daphnia similis. The C/P ratios of S. obliquus in four treatments were 881. 8,512. 3,124. 3 and 42. 4,respectively. The growth rates of D. similis in four treatments were 0.15,0.27,0.47 and 0.44 d-1,respectively. D. similis did not release any offspring during this period of growth in treatment with C/P = 881.8. The average numbers of offspring of first adult instar of D. similis in other three treatments were 1.2±1.3,9.8±2.3 and 9.5± 2.5 ind./female,respectively. The results showed that the growth rate and offspring number of D. similis decreased when the C/P ratio of S. obliquus was too high（ 512.3 and 881.8） or too low（ 42.4） compared with C/P = 124.3. Our study indicated that different C/P ratios of food could affect the growth and reproduction of Daphnia,thus determining their survival in freshwater lakes.

关 键 词：碳磷比 斜生栅藻 同型溞 体长 生长速率 繁殖 

分 类 号：Q178[生物学—水生生物学]