Cyanobacteria facilitate parasite epidemics in Daphnia.
Cyanobacteria facilitate parasite epidemics in Daphnia.
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DOI：
10.1002/ecy.1576
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发表时间：
2016-12
期刊：
影响因子：
4.8
通讯作者：
C. Tellenbach;C. Tellenbach;Nadine Tardent;Francesco Pomati;Francesco Pomati;Barbara Keller;Barbara Keller;Nelson G. Hairston;Nelson G. Hairston;Justyna Wolinska;Justyna Wolinska;P. Spaak;P. Spaak
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文献类型：
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作者：
C. Tellenbach;C. Tellenbach;Nadine Tardent;Francesco Pomati;Francesco Pomati;Barbara Keller;Barbara Keller;Nelson G. Hairston;Nelson G. Hairston;Justyna Wolinska;Justyna Wolinska;P. Spaak;P. Spaak
蓝藻在湖泊生态系统浮游植物群落中的季节性优势可能对更高的营养水平产生严重影响。对于水蚤等草食性浮游动物来说，蓝藻的营养价值较差，有些种类会产生毒素，影响浮游动物的生存和繁殖。在这里，我们提出了另一个，迄今为止在很大程度上未开发的蓝藻方面，即它们可以增加水蚤对寄生虫的敏感性。在Greifensee（瑞士）对水蚤群落进行的为期12年的月度时间序列分析中，我们观察到蓝藻密度与水蚤常见肠道寄生虫——墨氏菌（Caullerya mesnili）的流行显著相关，无论蓝藻种类是什么，也无论它是群体还是丝状。前一个月的温度也直接或间接地通过促进蓝藻的生长影响了茎勒菌流行病的发生。实验室实验证实，蓝藻增加了水蚤对茎状芽孢杆菌的敏感性，并提出可能与蓝藻毒素或蓝藻的其他化学特性有关。这些发现扩大了我们对有毒蓝藻繁殖对湖泊生态系统的影响的理解，并可能与其他水生物种所经历的流行病有关。
The seasonal dominance of cyanobacteria in the phytoplankton community of lake ecosystems can have severe implications for higher trophic levels. For herbivorous zooplankton such as Daphnia, cyanobacteria have poor nutritional value and some species can produce toxins affecting zooplankton survival and reproduction. Here we present another, hitherto largely unexplored aspect of cyanobacteria, namely that they can increase Daphnia susceptibility to parasites. In a 12-yr monthly time-series analysis of the Daphnia community in Greifensee (Switzerland), we observed that cyanobacteria density correlated significantly with the epidemics of a common gut parasite of Daphnia, Caullerya mesnili, regardless of what cyanobacteria species was present or whether it was colonial or filamentous. The temperature from the previous month also affected the occurrence of Caullerya epidemics, either directly or indirectly by the promotion of cyanobacterial growth. A laboratory experiment confirmed that cyanobacteria increase the susceptibility of Daphnia to Caullerya, and suggested a possible involvement of cyanotoxins or other chemical traits of cyanobacteria in this process. These findings expand our understanding of the consequences of toxic cyanobacterial blooms for lake ecosystems and might be relevant for epidemics experienced by other aquatic species.