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引用本文:张钰,谷孝鸿,朱光敏,何俊.太湖微囊藻对几种枝角类种群影响的实验生物学分析.湖泊科学,2007,19(5):566-571. DOI:10.18307/2007.0511
ZHANG Yu,GU Xiaohong,ZHU Guangmin,HE Jun.Experimental biological approach to the effects of Microcystis on some cladoceran population in Lake Taihu. J. Lake Sci.2007,19(5):566-571. DOI:10.18307/2007.0511
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太湖微囊藻对几种枝角类种群影响的实验生物学分析
张钰1,2, 谷孝鸿1, 朱光敏3, 何俊1,2
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.中国科学院研究生院, 北京 100049;3.南京林业大学森林资源与环境学院, 南京 210037
摘要:
微囊藻是形成蓝藻水华最普遍的一种, 不同枝角类受微囊藻的影响不同。实验从太湖梅梁湾分离天然的微囊藻, 研究了其对长刺溞、隆线溞、短尾秀体溞和角突网纹溞四种枝角类存活和生殖的影响。在微囊藻食物浓度为1×106 cells/ ml, 测得四种枝角类的半致死时间(LT50)分别为长刺潘3.03d、隆线溞3.79d、短尾秀体溞8.48d和角突网纹溞9.25d, 体长较小的短尾秀体溞和角突网纹溞的半致死时间相对较长;实验过程中没有观察到长刺溞和隆线溞有新生幼体, 而短尾秀体溞和角突网纹溞在少数几天里产出了少量新生幼体, 以不同浓度微囊藻(0.5×106-8×106cells/ml)喂养枝角类, 测得四种枝角类的24h半致死浓度(LC50)分别为:4.10×106、4.78×106、6.21×106和7.77×106 cells/ml。参照以栅藻喂养的枝角类生长情况, 可知太湖微囊藻对四种枝角类的存活和生殖有很强的负面作用, 其中体长较大的长刺溞和隆线溞受的影响相对较大。
关键词:  太湖  微囊藻  枝角类  半致死时间  半致死浓度
DOI:10.18307/2007.0511
分类号:
基金项目:江苏省自然科学基金项目资助(BK2002148)
Experimental biological approach to the effects of Microcystis on some cladoceran population in Lake Taihu
ZHANG Yu1,2, GU Xiaohong1, ZHU Guangmin3, HE Jun1,2
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.Nanjing Forest University, Nanjing 210037, P. R. China
Abstract:
Microcystis is one of the most common and most studied bloom-forming cyanobacteria and a well-known producer of microcystins. Different cladocerans usually exhibited different responses to the toxicity of Microcystis. In the present study, the effects of toxic Microcystis from Lake Taihu were investigated by performing, acute tests on cladocerans (Daphnia longispina, Daphnia carinata, Diaphanosoma brachyurum and Ceriodaphnia cornuta), using crude Microcystis extract. On a diet of Microcysits (1 106 cells/ml), the median lethal time(LT50) of four cladocerans were 3.03、3.79、8.48 and 9.25 days, respectively. The longer LTS0 were recorded for D. brachyurum and C. cornuta which have small size. Among the experiment, there was no new neonates of D. longispina and D. carinata, and few new neonates of D. brachyurum and C. cornuta. The 24h-LC50 of D. longispina, D. carinata, D. brachyurum and C. cornuta were 4.10×106、4.78×106、6.21×106和7.77×106 cells/ml. So, the effects of Microcystis on the survivorship and fecundity of cladoceran population in Lake Taihu were very intense, and the effects of D. brachyurum and C. cornuta which have small size were relatively gently.
Key words:  Lake Taihu  Microcystis  cladoceran  median lethal time  median lethal concentration
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