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首页> 外文期刊>Lakes & Reservoirs >A role for aeration and intake depth in managing toxic Cylindrospermopsis: A comparison between off-stream and riverine environments in the Fitzroy Basin, Australia
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A role for aeration and intake depth in managing toxic Cylindrospermopsis: A comparison between off-stream and riverine environments in the Fitzroy Basin, Australia

机译：曝气和进水深度在管理有毒圆柱藻中的作用：澳大利亚菲茨罗伊盆地下游和河流环境的比较

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Cylindrospermopsis is a cyanobacterial species of global concern, due to its ability to produce potent toxins and its near-cosmopolitan distribution. To date, both management and research efforts for Cylindrospermopsis have focused on riverine settings. By contrast, off-stream storages are inadequately studied, particularly in terms of population dynamics and toxin profiles, how these are linked with the riverine systems that seed them, and what management options are best for optimizing water quality. This is a critical gap, given that storages are key off-take points for many water users, including for livestock watering and industrial supply. This study examined the relationship between a riverine and an off-stream environment, with respect to the development of toxic Cylindrospermopsis blooms in central Queensland. It discusses the role of an aeration system in preventing or delaying bloom development and explores the implications of intake depth with respect to population (cell density) and toxicity. Along the impounded river, the study sites featured warm, stratified conditions and an anoxic hypolimnion. By contrast, the off-stream storage dam lacked stratification, due to the constant aeration provided by a hypolimnetic bubbler. Cylindrospermopsis raciborskii blooms appeared in both environments, with peak cellular concentrations detected in the subsurface waters. The dynamics of the toxin profiles differed, however, with the riverine concentrations being mostly epilimnetic, whereas the dam featured toxin distributed throughout the water column. Concentrations of both cylindrospermopsin (CYN) and deoxy-cylindrospermopsin (deoxy-CYN) were lower in the dam, compared with the riverine sites. A one-month lag period was evident before C. raciborskii cells appeared in the dam following their observation in the river samples, and a similar period elapsed before the dam populations reached their peak concentrations. These data are invaluable in considering the best management options for off-stream sites that experience seeding from riverine populations, particularly for toxin producers such as Cylindrospermopsis.
机译：圆柱精子是全球关注的蓝细菌物种，因为其产生有效毒素的能力及其近乎世界性的分布。迄今为止，对圆柱精子的管理和研究工作都集中在河流环境上。相比之下，对下游蓄水库的研究不足，特别是在种群动态和毒素分布，它们与播种它们的河流系统之间如何联系以及哪种管理方案最适合优化水质方面。鉴于存储是许多用水者（包括牲畜浇水和工业供应）的主要取水点，因此这是一个关键的缺口。这项研究检查了河流和下游环境之间的关系，以及昆士兰州中部有毒圆柱藻开花的发展。它讨论了曝气系统在防止或延迟开花发展中的作用，并探讨了进水深度对种群（细胞密度）和毒性的影响。沿蓄水河沿岸，研究地点具有温暖，分层的条件和缺氧性水滑石。相比之下，由于低通量起泡器提供恒定的通气，因此下游储水坝缺乏分层。两种环境中都出现了圆柏，在地下水域中检测到峰值细胞浓度。然而，毒素分布的动态是不同的，河水浓度主要是表生的，而大坝的毒素分布在整个水柱中。与河岸地区相比，大坝中的圆柱藻精蛋白（CYN）和脱氧圆柱精蛋白（deoxy-CYN）的浓度均较低。在河样中观察到明显的R.borciborskii细胞出现在大坝之前有一个月的滞后期，而在大坝种群达到峰值浓度之前也经历了相似的时期。这些数据对于考虑从河川种群中播种的下游站点，尤其是对于诸如Cylindrospermopsis之类的毒素生产者而言，是最佳的管理选择方案。

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