FATE OF THE TOXIC CYCLIC HEPTAPEPTIDES, THE MICROCYSTINS, FROM BLOOMS OF MICROCYSTIS (CYANOBACTERIA) IN A HYPERTROPHIC LAKE 1
FATE OF THE TOXIC CYCLIC HEPTAPEPTIDES, THE MICROCYSTINS, FROM BLOOMS OF MICROCYSTIS (CYANOBACTERIA) IN A HYPERTROPHIC LAKE 1
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DOI：
10.1111/j.0022-3646.1992.00761.x
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发表时间：
1992-12
影响因子：
2.9
通讯作者：
M. Watanabe;K. Kaya;N. Takamura
中科院分区：
文献类型：
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作者：
M. Watanabe;K. Kaya;N. Takamura
在肥厚的日本湖泊中的两个站对微囊藻水华产生的有毒环七肽（微囊藻毒素）的原位命运进行了检查。所有微囊藻样品中均检测到微囊藻毒素，其含量随季节和空间变化（第 1 阶段为 230–950 μg·g 干 wt−1，第 2 阶段为 160–746 μg·g 干 wt−1），由微囊藻毒素-LR、-RR 和-YR 组成。微囊藻毒素-RR 是大多数样本中的主要毒素。仅在一份过滤湖水样本中就检测到大量微囊藻毒素（1.1 μg·L−1）。通过新开发的方程模型间接估计了浮游动物中微囊藻毒素的积累。浮游动物群落中积累了大量的微囊藻毒素（75–1387 μg·g干重−1），该群落由两种枝角动物（Bosmina fatalis Burckhardt 和 Diaphanosoma brachyurum Lieve）以及一种桡足类动物（Cyclops vicinus Uljanin）组成，与有毒的微囊藻华期同时出现。浮游动物中微囊藻毒素含量与微囊藻中微囊藻毒素含量的最大百分比为202%。在这三种浮游动物中，只有致命拟杆菌似乎对微囊藻毒素的积累负责，因为粘状拟杆菌似乎避免与微囊藻细胞接触，而短囊藻不消耗微囊藻菌落。微囊藻毒素可以通过致命芽孢杆菌转移到更高的营养水平。
The in situ fate of the toxic cyclic heptapeptides, the microcystins, produced by blooms of Microcystis was examined at two stations in a hypertrophic Japanese lake. Microcystins were detected in all samples of Microcystis with quantities varying seasonally and spatially (230–950 μg · g dry wt−1 at St. 1 and 160–746 μg · g dry wt−1 at St. 2) and composed of microcystin‐LR, ‐RR, and‐YR. Microcystin‐RR was the dominant toxin in most samples. A large amount of microcystin (1.1 μg · L−1) was detected in only one sample of filtered lake water. Accumulation of microcystin in zooplankton was indirectly estimated from a newly developed equation model. Large amounts of microcystin (75–1387 μg · g dry wt−1) were accumulated in the zooplankton community, which consisted of two cladocerans, Bosmina fatalis Burckhardt and Diaphanosoma brachyurum Lieve, and a copepod, Cyclops vicinus Uljanin, that co‐occurred with the toxic Microcystis blooms. The maximum percent of microcystin content in zooplankton to that in Microcystis was 202%. Among the three species of zooplankton, only B. fatalis seemed to be responsible for accumulation of the microcystins because C. vicinus appeared to avoid contact with Microcystis cells and D. brachyurum did not consume colonies of Microcystis. Microcystins may be transferred to higher trophic levels through B. fatalis.