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首页> 外文期刊>Harmful Algae >Invasion and toxin production by exotic nostocalean cyanobacteria (Cuspidothrix, Cylindrospermopsis, and Sphaerospermopsis) in the Nakdong River, Korea
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Invasion and toxin production by exotic nostocalean cyanobacteria (Cuspidothrix, Cylindrospermopsis, and Sphaerospermopsis) in the Nakdong River, Korea

机译：在Nakdong River，韩国侵袭和毒素的侵袭和毒素生产的异国情调的怀古腊肠青霉菌（Cuspidothrix，Cylindrospermopsis和Sphaerospermopsis）

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摘要

The extent and frequency of harmful cyanobacterial blooms are increasing, owing to the climate change caused by global warming, and some harmful filamentous cyanobacteria that were first reported in the tropics are spreading to temperate regions, such as North America, Europe, and Northeast Asia. Although these exotic invasive cyanobacteria have a high toxigenic potential, they are not targeted in management plans in many countries. This study analyzed the occurrence of and potential toxin and off-flavor secondary metabolite production by invasive nostocalean cyanobacteria in the Nakdong River in Korea, which is a temperate region. The occurrence of four species belonging to three genera of cyanobacteria was confirmed in the Nakdong River. The quantities of cyanobacteria in the Nakdong River were mostly low, fewer than 1,000 cells mL(-1). Twenty-four strains belonging to four species in three genera of cyanobacteria were isolated from the Nakdong River. Analysis revealed no off-flavor secondary metabolite production by any of the isolates, and those belonging to Cylindrospermopsis raciborskii, Sphaerospermopsis aphanizomenoides, and S. reniformis were identified as nontoxic strains. However, anatoxin-a production was observed in two of the eleven isolates of Cuspidothrix issatschenkoi. Given the sites and the timing of its occurrence, C. issatschenkoi had the highest potential for toxin production among the invasive nostocalean cyanobacteria appearing in the Nakdong River.
机译：由于全球变暖引起的气候变化，对热带地区首次报道的一些有害丝状细胞的气候变化，有害的蓝细菌绽放的程度和频率正在增加，并且在热带地区报道的一些有害的丝状细菌正在蔓延到温带地区，例如北美，欧洲和东北亚。虽然这些异国情调的侵袭性蓝细菌具有高毒性潜力，但它们并非在许多国家的管理计划中瞄准。本研究分析了韩国中南东河侵袭性的怀旧植物细菌的发生和潜在的毒素和潜在的毒素和冒毒次生代谢产量，这是一种温带地区。在Nakdong河中证实了属于三个胞嘧啶的四种物种的发生。 Nakdong河中的蓝藻数量大多低于1,000个细胞ml（-1）。从Nakdong河中分离出三个属于三种胞嘧啶的四种物种的二十四株菌株。分析揭示了任何分离株的异常次级代谢产物，以及属于Cylindrospermopsis raciborskii，sphaerospermopsis aphanizomenoides和肾状体的那些分离物被鉴定为无毒菌株。然而，在Cuspidothrix Issatschenkoi的2个分离株中观察到anatoxin-A的产生。鉴于该地点和其发生的时间，C.Sasatschenkoi在Nakdong河中出现的侵袭性的怀古腊肠蓝藻中具有最高的毒素生产潜力。

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