Instituto del Mar del Peru, Esquina Gamarra y General Valle S/N Chucuito Callao, Peru.
Organismo Nacional de Sanidad Pesquera, Domingo Orué 165, Surquillo, Lima, Peru.
Mar Pollut Bull. 2021 Dec;173(Pt A):112988. doi: 10.1016/j.marpolbul.2021.112988. Epub 2021 Sep 25.
In recent years, dense Alexandrium ostenfeldii blooms have been reported in different coastal areas. In this study, we report for the first time the occurrence of A. ostenfeldii blooms associated with the detection of paralytic shellfish toxins (PSTs) in the Peruvian scallop (Argopecten purpuratus) from Paracas Bay. Alexandrium ostenfeldii blooms occurred at the end of summer and early fall, after the increase of riverine input and under stratified conditions following a decrease in wind velocity. The highest abundances occurred during warm sea surface temperatures (18-27 °C). High PST concentrations that exceed the maximum permissible level (800 μg STX eq. kg) occurred even under low A. ostenfeldii abundances (20 × 10 cells l). Our results contribute to a better understanding of the dynamics of A. ostenfeldii in coastal systems influenced by riverine inputs and upwelling and can be used to improve monitoring programs and allow the implementation of mitigation measures along the Peruvian coast.
近年来，不同沿海地区都报告了密集的亚历山大藻（Alexandrium ostenfeldii）水华。在这项研究中，我们首次报告了与秘鲁扇贝（Argopecten purpuratus）中麻痹性贝类毒素（PSTs）检测相关的亚历山大藻水华的发生情况，该扇贝来自帕拉卡斯湾。亚历山大藻水华发生在夏末和初秋，在河流输入增加和风速降低导致分层条件下。最高丰度出现在温暖的海水温度（18-27°C）下。即使在亚历山大藻丰度较低（20×10 个细胞 l）的情况下，仍出现了超过最高允许水平（800μg STX eq. kg）的高 PST 浓度。我们的研究结果有助于更好地了解受河流输入和上升流影响的沿海系统中亚历山大藻的动态，可用于改进监测计划，并在秘鲁沿海实施缓解措施。
