Microcystis aeruginosa strengthens the advantage of Daphnia similoides in competition with Moina micrura.
Microcystis aeruginosa strengthens the advantage of Daphnia similoides in competition with Moina micrura.
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铜绿微囊藻增强了类水蚤与裸腹藻的竞争优势
DOI：
10.1038/s41598-017-10844-7
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发表时间：
2017-08-31
影响因子：
4.6
通讯作者：
Chen Y
中科院分区：
文献类型：
--
作者：
Tang H;Hou X;Xue X;Chen R;Zhu X;Huang Y;Chen Y
微囊藻水华通常与浮游动物的变化，干扰种间关系。微囊藻对不同大小浮游动物竞争优势的影响具有种属特异性。我们使用含有0%、20%和35%有毒微囊藻的混合饲料，评价了小型裸腹蚤和大型拟水蚤对微囊藻存在的竞争反应。铜绿假单胞菌和其余的绿色小球藻蛋白核。在试验的饲料组合下，两个物种没有发生竞争排斥。在M的缺席下。在铜绿假单胞菌中，两种枝角类的生物量因竞争而减少。而生物量越大，对水蚤的抑制作用越小，说明水蚤具有竞争优势。M.铜绿假单胞菌处理抑制了两种枝角类的种群增长，并降低了其承载力。然而，微囊藻在饵料中所占比例的增加缓解了竞争对水蚤种群的抑制作用。因此，水蚤的竞争优势变得更加明显，更高的水蚤：裸腹藻生物量的比例与微囊藻的比例增加。这些结果表明M. aeruginosa增强了D. similoides与M.微藻，这有助于在蓝藻水华期间在实地观察到的浮游动物多样化的变化。
Microcystis blooms are generally associated with zooplankton shifts by disturbing interspecific relationships. The influence of Microcystis on competitive dominance by different sized zooplanktons showed species-specific dependence. We evaluated the competitive responses of small Moina micrura and large Daphnia similoides to the presence of Microcystis using mixed diets comprising 0%, 20%, and 35% of toxic M. aeruginosa, and the rest of green alga Chlorella pyrenoidosa. No competitive exclusion occurred for the two species under the tested diet combinations. In the absence of M. aeruginosa, the biomasses of the two cladocerans were decreased by the competition between them. However, the Daphnia was less inhibited with the higher biomass, suggesting the competitive dominance of Daphnia. M. aeruginosa treatment suppressed the population growths of the two cladocerans, with the reduced carrying capacities. Nonetheless, the population inhibition of Daphnia by competition was alleviated by the increased Microcystis proportion in diet. As a result, the competitive advantage of Daphnia became more pronounced, as indicated by the higher Daphnia: Moina biomass ratio with increased Microcystis proportions. These results suggested that M. aeruginosa strengthens the advantage of D. similoides in competition with M. micrura, which contributes to the diversified zooplankton shifts observed in fields during cyanobacteria blooms.
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