Widespread dispersal and bio-accumulation of toxic microcystins in benthic marine ecosystems.
Widespread dispersal and bio-accumulation of toxic microcystins in benthic marine ecosystems.
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DOI：
10.1016/j.chemosphere.2016.10.029
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发表时间：
2017
期刊：
影响因子：
8.8
通讯作者：
Akira Umehara;Tohru Takahashi;Tomohiro Komorita;R. Orita;Jin-Woo Choi;Risa Takenaka;Rie Mabuchi;Ho-Dong Park;H. Tsutsumi
中科院分区：
文献类型：
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作者：
Akira Umehara;Tohru Takahashi;Tomohiro Komorita;R. Orita;Jin-Woo Choi;Risa Takenaka;Rie Mabuchi;Ho-Dong Park;H. Tsutsumi
淡水蓝藻产生有毒的微囊藻毒素（MCs），从淡水地区进入海洋。淡水水库中蓝藻产生的MCs经常被排放到邻近的Isahaya湾，并留在表层沉积物中，然后在海底的各种大型底栖动物体内积累。研究期间，两湾沉积物中MC含量的中位数水平基本一致，且时间变化也较为相似。因此，地表沉积物中MC含量的波动受到水库放水时间的物理控制。在伊沙哈雅湾采集的多毛类和牡蛎中MC含量在冬季显著增加。海湾沉积物、初级消费者和次级消费者碳基MC含量中位数分别为87、160和250 ngMC gC−1。这些结果表明了底栖海洋生态系统在较低营养水平上的生物积累。了解沉积物和大型底栖动物之间发生的过程对于阐明生态系统中MC动力学具有重要意义。
Freshwater cyanobacteria produce toxic microcystins (MCs), which travel from freshwater areas into the sea. The MCs produced by cyanobacteria in a freshwater reservoir were discharged frequently into the adjacent Isahaya Bay, remained in the surface sediments, and then accumulated in various macrobenthic animals on the seafloor. The MCs were transported further outside of Isahaya Bay (Ariake Bay), and the median values of the MC contents in the sediments were in the same levels in both bays, while their temporal variations were also similar during the study period. Therefore, the fluctuations of the MC contents in the surface sediments were physically controlled by the timing of the discharge from the reservoir. The MC contents in polychaetes and oysters collected in Isahaya Bay increased markedly during winter. The median values of the carbon-based MC contents in the sediments, primary consumers, and secondary consumers in the bay were 87, 160, and 250 ngMC gC−1, respectively. These results demonstrated bio-accumulation at lower trophic levels in benthic marine ecosystems. An understanding of the processes occurring between sediments and macrobenthic animals is important for clarifying MC dynamics in ecosystems.