Cyanobacterial bloom associated with a complete turnover of a Daphnia population in a warm-temperate eutrophic lake in Eastern China
Cyanobacterial bloom associated with a complete turnover of a Daphnia population in a warm-temperate eutrophic lake in Eastern China
复制标题
中国东部暖温带富营养化湖泊中蓝藻水华与水蚤种群的完全更替有关
DOI：
10.1111/fwb.13858
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发表时间：
2021-12-02
影响因子：
2.7
通讯作者：
Yin，Mingbo
中科院分区：
文献类型：
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作者：
Ma，Xiaolin;Deng，Zhixiong;Yin，Mingbo
2012年4月至2014年5月，对中国东部一个暖温带无冰湖泊的浮游动物进行了为期26个月的监测，重点研究了枝藻类的季节性种群动态。根据14个微卫星位点对21个月内存在盔状杜父鱼的样本进行遗传分析，结果表明，有几个克隆能成功越冬和/或存活数月。然而，所有的克隆，包括这些长寿的克隆，在2013年10月之后被新的完全取代，可能是由于那个夏天的蓝藻水华。在盔状水蚤种群中观察到高的克隆丰富度和高的更新率，表明频繁的有性繁殖。（湖中最丰富的有毒蓝藻物种）的生存率大幅下降，我们的研究结果突出了在一个群落和克隆结构方面的动物群落种群动态的变化，因此，需要进一步研究浮游动物对蓝藻水华的生态响应。
The effect of cyanobacterial blooms on aquatic ecosystems has received wide attention, yet little is known about their impacts on zooplankton genetic structure.For 26 months (April 2012–May 2014), we monitored zooplankton in a warm‐temperate ice‐free lake in Eastern China, with an emphasis on seasonal population dynamics of the cladoceran,Daphnia galeata. There was a seasonal succession in the zooplanktonic community (composed of Cladocera, Copepoda, and Rotifera).Genetic analysis (based on 14 microsatellite loci) of the 21 monthly samples in whichD. galeatawas present demonstrated that several clones could successfully overwinter and/or persist for many months. However, all clones, including these long‐lived clones, were completely replaced by new ones after October 2013, probably due to cyanobacteria blooms in that summer. A high clonal richness coupled with high turnover rate was observed in theD.galeatapopulation overall, suggesting frequent sexual reproduction.Daphnia galeataexperimentally fed with a diet ofMicrocystis aeruginosa(the most abundant toxic cyanobacterial species in the lake) had a substantially reduced survivorship, consistent with the field observations.Our findings highlight the changes of zooplanktonic population dynamics in terms of both community and clonal structure in a warm‐temperate ice‐free lake, and call for further investigation on ecological responses of zooplankton to cyanobacterial blooms.