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Cyanobacteria and cyanotoxins at the river-estuarine transition
Harmful Algae ( IF 6.6 ) Pub Date : 2018-06-07 , DOI: 10.1016/j.hal.2018.04.012
Paul A. Bukaveckas , Rima Franklin , Spencer Tassone , Brendan Trache , Todd Egerton

We examined seasonal and longitudinal patterns in the occurrence of toxic cyanobacteria in the James River Estuary (Virginia). Highest chlorophyll and cyanobacteria levels were observed in the tidal freshwater segment, particularly during dry summers when freshwater replacement time was long. Cyanobacteria accounted for a small proportion of phytoplankton biomass (7–15%), and Microcystis comprised a small proportion of the cyanobacteria (<1%). Despite this, measureable levels of microcystin were commonly observed in water (>85% of samples in July, August and September), fish tissues (87% of planktivorous fishes) and shellfish (83% of individuals). Generic indicators of algal blooms (chlorophyll and algal biomass) had limited utility for predicting microcystin concentrations. However, chlorophyll was found to be a useful predictor for the probability of exceeding specific toxin thresholds. Tissue microcystin concentrations were highest in fish and shellfish collected from the tidal fresh segment, but were detectable in biota collected from the oligohaline at distances 50 km seaward.



中文翻译:

河口过渡期的蓝细菌和氰毒素

我们研究了詹姆斯河河口(弗吉尼亚州)中有毒蓝细菌发生的季节性和纵向模式。在潮汐淡水段中观察到最高的叶绿素和蓝细菌水平,特别是在淡水替换时间很长的干旱夏季。蓝细菌占浮游植物生物量的一小部分(7–15%),微囊藻仅占蓝细菌的一小部分(<1%)。尽管如此,通常在水(7月,8月和9月的样本中> 85%),鱼组织(浮游鱼类的87%)和贝类(83%的个体)中观察到可测水平的微囊藻毒素。藻华(叶绿素和藻生物质)的一般指标在预测微囊藻毒素浓度方面的用途有限。但是,发现叶绿素是超过特定毒素阈值的可能性的有用预测因子。从潮汐新鲜部分收集的鱼类和贝类中,组织微囊藻毒素的浓度最高,但在向海50公里处从寡盐收集的生物群中可检测到。

更新日期:2018-06-07
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