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首页> 外文期刊>Harmful Algae >Cross talk: Two way allelopathic interactions between toxic Microcystis and Daphnia
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Cross talk: Two way allelopathic interactions between toxic Microcystis and Daphnia

机译：交叉谈话：有毒微囊杆菌和吡虫之间的两种方式化感应相互作用

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Due to eutrophication, freshwater ecosystems frequently experience cyanobacterial blooms, many of which produce bioactive metabolites that can affect vertebrates and invertebrates life traits. Zooplankton are able to develop tolerance as a physiological response to cyanobacteria and their bioactive compounds, however, this comes with energetic cost that in turn influence Daphnia life traits and may impair populations. Vice versa, it has been suggested that Daphnia are able to reduce cyanobacterial dominance until a certain cyanobacterial density; it remains unclear whether Daphnia metabolites alone influence the physiological state and bioactive metabolites production of cyanobacteria. Hence, this study investigates mutual physiological reactions of toxic Microcystis aeruginosa PCC7806 and Daphnia magna. We hypothesize that a) the presence of D. magna will negatively affect growth, increase stress response and metabolites production in M. aeruginosa PCC7806 and b) the presence of M. aeruginosa PCC7806 will negatively affect physiological responses and life traits in D. magna. In order to test these hypotheses experiments were conducted in a specially designed co-culture chamber that allows exchange of the metabolites without direct contact. A clear mutual impact was evidenced. Cyanobacterial metabolites reduced survival of D. magna and decreased oxidative stress enzyme activity. Simultaneously, presence of D. magna did not affect photosynthetic activity. However, ROS increase and tendencies in cell density decrease were observed on the same day, suggesting possible energy allocation towards anti-oxidative stress enzymes, or other protection mechanisms against Daphnia infochemicals, as the strain managed to recover. Elevated concentration of intracellular and overall extracellular microcystin MC-LR, as well as intracellular concentrations of aerucyclamide A and D in the presence of Daphnia, indicating a potential protective or anti-grazing function. However, more research is needed to confirm these findings.
机译：由于富营养化，淡水生态系统经常经历蓝藻绽放，其中许多产生了可能影响脊椎动物和无脊椎动物寿命性状的生物活性代谢物。浮游动物能够发展耐受性对蓝藻的生理反应及其生物活性化合物，然而，这是充满活力的成本，反过来影响Daphnia Life特征，可能损害人口。反之亦然，已经提示，Daphnia能够降低蓝藻占主导地位，直到某种蓝细菌密度;仍然目前还不清楚Daphnia代谢物是否仅影响天生素的生理状态和生物活性代谢物产生。因此，本研究研究了有毒微囊杆菌铜绿假单胞菌PCC7806和Daphnia Magna的互生理反应。我们假设a）D. Magna的存在将对生长产生负面影响，增加铜绿假单胞菌PCC7806和B）M. Aerginosa PCC7806的存在对D. Magna中的生理反应和生命特征产生负面影响。为了测试这些假设在专门设计的共培腔中进行实验，其允许在没有直接接触的情况下交换代谢物。证明了明确的共同影响。蓝杆菌代谢物降低了D.MAMA的存活率，降低了氧化应激酶活性。同时，D. Magna的存在不影响光合活动。然而，在同一天观察到细胞密度减少的ROS增加和趋势，表明可能对抗氧化应激酶的能量分配，或对Daphnia无穷无胆的其他保护机制，因为菌株恢复。细胞内和整体细胞外微囊藻MC-LR的浓度升高，以及在Daphnia存在下的航空蛋白A和D细胞内浓度，表明潜在的保护或防放牧功能。但是，需要更多的研究来确认这些发现。

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