| 引用本文: | 张慧,蔡敏,陈非洲.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.湖泊科学,2017,29(5):1188-1194. DOI:10.18307/2017.0516 |
| ZHANG Hui,CAI Min,CHEN Feizhou.Effects of Scenedesmus obliquus with different C/P ratios on the growth and reproduction of Daphnia similis. J. Lake Sci.2017,29(5):1188-1194. DOI:10.18307/2017.0516 |
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| 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. |
| 关键词: 碳磷比 斜生栅藻 同型溞 体长 生长速率 繁殖 |
| DOI：10.18307/2017.0516 |
| 分类号: |
| 基金项目:国家自然科学基金项目（41271523，31670463）资助. |
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| Effects of Scenedesmus obliquus with different C/P ratios on the growth and reproduction of Daphnia similis |
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ZHANG Hui1,2, CAI Min1,2, CHEN Feizhou1
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1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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| Abstract: |
| 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 dur-ing 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 off-spring 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) com-pared 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. |
| Key words: C/P ratio Scenedesmus obliquus Daphnia similis body length growth rate reproduction |
