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首页> 外文期刊>Environmental Science & Technology >Cyanobacteria Affect Fitness and Genetic Structure of Experimental Daphnia Populations
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Cyanobacteria Affect Fitness and Genetic Structure of Experimental Daphnia Populations

机译：蓝细菌影响实验水蚤种群的适应性和遗传结构。

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摘要

Zooplankton communities can be strongly affected by cyanobacterial blooms, especially species of genus Daphnia, which are key-species in lake ecosystems. Here, we explored the effect of microcystinonmicrocystin (MCon-MC) producing cyanobacteria in the diet of experimental Daphnia galeata populations composed of eight genotypes. We used D. galeata clones hatched from ephippia 10 to 60 years old, which were first tested in monocultures, and then exposed for 10 weeks as mixed populations to three food treatments consisting of green algae combined with cyanobacteria able/unable of producing MC. We measured the expression of nine genes potentially involved in Daphnia acclimation to cyanobacteria: six protease genes, one ubiquitin-conjugating enzyme gene, and two rRNA genes, and then we tracked the dynamics of the genotypes in mixed populations. The expression pattern of one protease and the ubiquitin-conjugating enzyme genes was positively correlated with the increased fitness of competing clones in the presence of cyanobacteria, suggesting physiological plasticity. The genotype dynamics in mixed populations was only partially related to the growth rates of clones in monocultures and varied strongly with the food. Our results revealed strong intraspecific differences in the tolerance of D. galeata clones to MCon-MC-producing cyanobacteria in their diet, suggesting microevolutionary effects.
机译：浮游动物群落会受到蓝藻水华的强烈影响，尤其是水蚤属的物种，水蚤是湖泊生态系统中的关键物种。在这里，我们探讨了由八种基因型组成的实验性蚤蚤的饮食中微囊藻毒素/非微囊藻毒素（MC / non-MC）产生蓝细菌的作用。我们使用了从10至60岁的ephippia孵化的D. galeata克隆，这些克隆首先在单培养中进行了测试，然后作为混合种群暴露于10周，接受三种食物处理，这些食物处理由绿藻和能够/不能产生MC的蓝细菌组成。我们测量了可能与蓝细菌适应水蚤相关的9个基因的表达：6个蛋白酶基因，1个泛素结合酶基因和2个rRNA基因，然后我们追踪了混合种群中基因型的动态。在蓝细菌的存在下，一种蛋白酶和泛素结合酶基因的表达模式与竞争性克隆的适应性增加呈正相关，表明其具有生理可塑性。混合种群中的基因型动态仅与单培养中无性系的生长速率有关，并且随食物而变化很大。我们的结果表明，饮食中D. galeata克隆对MC /非MC产生的蓝细菌的耐受性存在强烈的种内差异，表明存在微进化作用。

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  • 来源
    《Environmental Science & Technology》 |2016年第7期|3416-3424|共9页
  • 作者

    Bogdan Druga; Patrick Turko; Piet Spaak; Francesco Pomati;

  • 作者单位

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, 133 UEberlandstrasse, 8600 Duebendorf, Switzerland,Institute of Biological Research, Branch of the National Institute of Research and Development for Biological Sciences, 48 Republicii, 400015 Cluj-Napoca, Romania;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, 133 UEberlandstrasse, 8600 Duebendorf, Switzerland,Institute of Integrative Biology, ETH Zurich, Universitaetstrasse 16, 8092 Zuerich, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, 133 UEberlandstrasse, 8600 Duebendorf, Switzerland,Institute of Integrative Biology, ETH Zurich, Universitaetstrasse 16, 8092 Zuerich, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, 133 UEberlandstrasse, 8600 Duebendorf, Switzerland,Institute of Integrative Biology, ETH Zurich, Universitaetstrasse 16, 8092 Zuerich, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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