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首页> 外文期刊>Lakes & Reservoirs >Dominance of Cylindrospermopsis raciborskii (Nostocales, Cyanoprokaryota) in Queensland tropical and subtropical reservoirs: Implications for monitoring and management
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Dominance of Cylindrospermopsis raciborskii (Nostocales, Cyanoprokaryota) in Queensland tropical and subtropical reservoirs: Implications for monitoring and management

机译：昆士兰热带和亚热带水库中 Cylindrospermopsis raciborskii （Nostocales，Cyanoprokaryota）的优势：对监测和管理的意义

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摘要

Since October 1997, 47 reservoirs and weir pools across tropical and subtropical Queensland have been regularly monitored for the occurrence of planktic cyanoprokaryotes. Cylindrospermopsis raciborskii (Woloszynska) Seenaya & Subba Raju (Nostocales, Cyanoprokaryota) was found in 70% of the storages, with one storage displaying year-round dominance, 50% of the reservoirs seasonally dominated and a seasonal presence in 46% of the weir pools. Maxima for the majority of storages occurred from late summer through to early autumn. The precise timing of onset of seasonal maxima varied considerably between storages and regions. Temperature and stratification patterns influenced seasonal recruitment with C. raciborskii reaching seasonal maxima in southern storages generally later than the northern storages. Overall peak seasonal abundance occurred in deep strongly stratified storages. The majority of storages experiencing concentrations > 15 000 cells mL–1 tested positive to the presence of the alkaloid cytotoxin, cylindrospermopsin. Median cylindrospermopsin concentration across the 14 reservoirs in which toxin was recorded was 3.4 Μg L–1. The highest toxin concentrations were generally associated with storages in which C. raciborskii had been established for a considerable period of time, or occurred after the peak summer population maxima. Toxin concentrations of 1 Μg L–1 were generally associated with cell concentrations of approximately 20 000 cells mL–1, hence this cell concentration threshold was adopted as a health trigger level at which to begin monitoring for toxicity. The morphology of this species was highly variable and included straight, coiled and sigmoid-shaped trichomes. Populations were routinely recorded as mixtures of all three morphotypes or proceeded as transitions from one morphotype to another throughout the year. The dominance of C. raciborskii appears to be favoured by a set of environmental and hydrological factors that include long water residence time, high pH, high temperature, high incident irradiation and a thermally stratified water column. The lack of visual monitoring cues, such as scum formation, variation in colour of the water body, rapid germination of large numbers of cells, highly variable morphology, relative toxicity and persistence of this species year round in many areas, continues to make this species a primary focus of water managers.
机译：自1997年10月以来，对热带和亚热带昆士兰州的47个水库和堰池进行了定期监测，以发现浮游性的氰基原核生物。 Cylinspermopsis raciborskii（Woloszynska）Seenaya和Subba Raju（Nostocales，Cyanoprokaryota）被发现在70％的储层中，其中一个储藏室表现出全年优势，50％的储层在季节上占主导地位，季节性分布在堰池中占46％ 。大部分仓储的千里马发生在夏末至秋初。季节性最大值发生的确切时间在不同的存储区域和地区之间差异很大。温度和分层模式影响了季节性募集，雷氏梭菌在南部储藏区通常比北部储藏区晚到达季节性最大值。整体深度峰值季节丰厚发生在深层强烈的储层中。多数浓度> 15000细胞mL-1的储藏库对生物碱细胞毒素cysdrodrospermopsin的检测呈阳性。在记录有毒素的14个储层中，总含量中的圆柱形精子蛋白浓度为3.4毫克L-1。最高的毒素浓度通常与在相当长的一段时间内建立了雷氏梭状芽孢杆菌的存储有关，或者发生在夏季人口高峰之后。 1毫克L-1的毒素浓度通常与约20000细胞mL-1的细胞浓度有关，因此，采用该细胞浓度阈值作为开始监测毒性的健康触发水平。该物种的形态变化很大，包括直的，盘绕的和乙状的毛状体。通常将种群记录为所有三种形态类型的混合物，或者全年记录从一种形态向另一种形态的转变。一系列环境和水文因素（包括长水停留时间，高pH，高温，高入射辐射和热分层水柱）似乎都有利于raciborskii的优势。缺乏视觉监测线索，例如浮渣的形成，水体颜色的变化，大量细胞的快速萌发，形态高度可变，相对毒性以及该物种在许多地区常年持续存在，继续使该物种水管理者的首要重点。

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