McKibben S Morgaine, Peterson William, Wood A Michelle, Trainer Vera L, Hunter Matthew, White Angelicque E
College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331;
Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Hatfield Marine Science Center, Newport, OR 97365.
Proc Natl Acad Sci U S A. 2017 Jan 10;114(2):239-244. doi: 10.1073/pnas.1606798114. Epub 2017 Jan 9.
Domoic acid is a potent neurotoxin produced by certain marine microalgae that can accumulate in the foodweb, posing a health threat to human seafood consumers and wildlife in coastal regions worldwide. Evidence of climatic regulation of domoic acid in shellfish over the past 20 y in the Northern California Current regime is shown. The timing of elevated domoic acid is strongly related to warm phases of the Pacific Decadal Oscillation and the Oceanic Niño Index, an indicator of El Niño events. Ocean conditions in the northeast Pacific that are associated with warm phases of these indices, including changes in prevailing currents and advection of anomalously warm water masses onto the continental shelf, are hypothesized to contribute to increases in this toxin. We present an applied domoic acid risk assessment model for the US West Coast based on combined climatic and local variables. Evidence of regional- to basin-scale controls on domoic acid has not previously been presented. Our findings have implications in coastal zones worldwide that are affected by this toxin and are particularly relevant given the increased frequency of anomalously warm ocean conditions.
软骨藻酸是一种由某些海洋微藻产生的强效神经毒素，它能够在食物网中累积，对全球沿海地区食用海产品的人类以及野生动物的健康构成威胁。本文展示了过去20年中北加利福尼亚海流区域贝类体内软骨藻酸受气候调节的证据。软骨藻酸含量升高的时间与太平洋年代际振荡的暖期以及厄尔尼诺事件的一个指标——海洋尼诺指数密切相关。据推测，东北太平洋与这些指数暖期相关的海洋状况，包括主要洋流的变化以及异常温暖水体向大陆架的平流输送，都促使了这种毒素含量的增加。我们基于气候和局部变量相结合的情况，为美国西海岸提出了一个实用的软骨藻酸风险评估模型。此前尚未有关于软骨藻酸区域至流域尺度控制的证据。我们的研究结果对全球受这种毒素影响的沿海地区具有启示意义，鉴于异常温暖海洋状况的频率增加，这一结果尤为重要。
