The contamination of coastal ecosystems from a variety of toxins of marine algal origin is a common and well-documented situation along the coasts of the United States and globally. The occurrence of toxins originating from cyanobacteria along marine coastlines is much less studied, and little information exists on whether toxins from marine and freshwater sources co-occur regularly. The current study focused on the discharge of cyanotoxins from a coastal lagoon (Santa Clara River Estuary) as a consequence of an extreme tide event (King Tides; December 3–5, 2017) resulting in a breach of the berm separating the lagoon from the ocean. Monthly monitoring in the lagoon throughout 2017 documented more than a dozen co-occurring cyanobacterial genera, as well as multiple algal and cyanobacterial toxins. Biotoxin monitoring before and following the King Tide event using Solid Phase Adsorption Toxin Tracking (SPATT) in the lagoon and along the coast revealed the co-occurrence of microcystins, anatoxin, domoic acid, and other toxins on multiple dates and locations. Domoic acid was ubiquitously present in SPATT deployed in the lagoon and along the coast. Microcystins were also commonly detected in both locations, although the beach berm retained the lagoonal water for much of the year. Mussels collected along the coast contained microcystins in approximately half the samples, particularly following the King Tide event. Anatoxin was observed in SPATT only in late December, following the breach of the berm. Our findings indicate both episodic and persistent occurrence of both cyanotoxins and marine toxins may commonly contaminate coastlines in proximity to cyanobacteria-laden creeks and lagoons.

各种海藻毒素对沿海生态系统的污染在美国和全球沿海地区是一种常见且有据可查的情况。对海洋海岸线上蓝细菌产生的毒素的研究少得多，关于海洋和淡水来源的毒素是否经常同时出现的信息也很少。目前的研究重点是由于极端潮汐事件（King Tides；2017 年 12 月 3 日至 5 日）造成的沿海泻湖（圣克拉拉河河口）的蓝藻毒素排放，导致将泻湖与海岸隔开的护堤破裂。海洋。整个 2017 年对泻湖的每月监测记录了十多个同时出现的蓝藻属，以及多种藻类和蓝藻毒素。在泻湖和沿海地区使用固相吸附毒素追踪 (SPATT) 对 King Tide 事件之前和之后的生物毒素进行监测，发现微囊藻毒素、类毒素、软骨藻酸和其他毒素在多个日期和地点同时出现。软骨藻酸普遍存在于部署在泻湖和沿海地区的 SPATT 中。尽管海滩护堤在一年中的大部分时间里都保留着泻湖水，但在这两个地方也经常检测到微囊藻毒素。沿海岸采集的贻贝在大约一半的样本中含有微囊藻毒素，尤其是在 King Tide 事件之后。仅在 12 月下旬，护堤被破坏后，才在 SPATT 中观察到 Anatoxin。