Combined effects of four Microcystis aeruginosa strains and Scenedesmus obliquus concentrations on population dynamics and resting egg formation of two Daphnia species
Combined effects of four Microcystis aeruginosa strains and Scenedesmus obliquus concentrations on population dynamics and resting egg formation of two Daphnia species
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四种铜绿微囊藻菌株和斜生栅藻浓度对两种水蚤种群动态和休眠卵形成的综合影响
DOI：
10.1007/s10201-014-0433-4
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发表时间：
2014-08-01
期刊：
影响因子：
1.6
通讯作者：
Huang, Qingfei
中科院分区：
文献类型：
--
作者：
Li, Fang;Deng, Daogui;Huang, Qingfei
我们检验了这一假说，即有毒微囊藻的种群动态，epipipipial生产，并休眠卵形成的水蚤的食物质量水平的限制。四个单细胞毒性M.本研究使用了具有对比浓度的微囊藻毒素的好氧藻株和两种水蚤。两种水蚤的第一次繁殖后代数、种群密度和最大种群增长率在最高毒力下较低。在两种浓度下比较了Aerodorosa7820处理与其他处理的栅藻。两种蚤类第一次繁殖的最大子代数均出现在毒性较高的M.在高浓度S.阿古斯M. aerodynosastries，S.在两种蚤类中，单种、双种和组合对首次繁殖后代数和最大种群增长率的影响均达到极显著水平（P< 0.001）。在两种浓度的S.阿古斯在低浓度S时，高毒M526处理的种群数量和最大种群增长率较低。在高浓度的S.阿古斯这一结果表明，高S。桦褐孔菌浓度可减轻M.气单胞菌和水蚤可利用毒性较低的微囊藻作为食物。两种蚤类的累积贴壁数在高浓度S时较多。比低浓度下的高。在低浓度S时，两种蚤类的无休眠卵的卵细胞比例明显高于其他蚤类。但在高浓度的S.阿古斯研究结果表明，在高水平食物下，水蚤的累积表肢数量与种群密度有关，而在低水平食物下，水蚤的表肢产量受微囊藻毒素浓度的显着控制。
We examined the hypothesis that toxic effects ofMicrocystis aeruginosato population dynamics, ephippial production, and resting egg formation ofDaphniawere restricted by food quality levels. Four unicellular, toxicM. aeruginosastrains with contrasting concentration of microcystin and twoDaphniaspecies were used in this study. The number of offspring at first reproduction, population densities, and maximum population growth rate of twoDaphniaspecies were lower at the highest toxicM. aeruginosa7820 treatment compared with other treatments under two concentrations ofScenedesmus obliquus. The maximum number of offspring at first reproduction of twoDaphniaspecies appeared in the higher toxicM. aeruginosa526 strain at the high concentration ofS. obliquus. The effects ofM. aeruginosastrains,S. obliquus, and their combination on the number of offspring at first reproduction and the maximum population growth rate of twoDaphniaspecies were significant (P< 0.001). TwoDaphniaspecies could not reproduce in the highest toxic M7820 treatment under two concentrations ofS. obliquus. They had lower population size and maximum population growth rate in the higher toxic M526 treatment at the low concentration ofS. obliquus, but they were higher at the high concentration ofS. obliquus. This result suggests that highS. obliquusconcentration could relieve the toxicity ofM. aeruginosatoDaphnia, andDaphniacould utilize the lower toxicMicrocystisas food. The cumulative ephippia numbers of twoDaphniaspecies were more at the high concentration ofS. obliquusthan those at the low concentration. The percentage of ephippia containing no resting eggs of twoDaphniaspecies was evidently higher at the low concentration ofS. obliquusbut was lower at the high concentration ofS. obliquus. Our results indicated that the cumulative ephippia numbers ofDaphniawere population density dependent at the high-level food, and the productions of ephippia inDaphniawere significantly controlled by microcystin concentration at the low-level food.