Winter distribution of toxic, potentially toxic phytoplankton, and shellfish toxins in fjords and channels of the Aysén region, Chile
Winter distribution of toxic, potentially toxic phytoplankton, and shellfish toxins in fjords and channels of the Aysén region, Chile
复制标题
智利艾森地区峡湾和河道中有毒、潜在有毒浮游植物和贝类毒素的冬季分布
DOI：
10.3856/vol46-issue1-fulltext-13
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发表时间：
2018
影响因子：
1
通讯作者：
L. Guzmán
中科院分区：
文献类型：
--
作者：
G. Pizarro;B. Paz;C. Alarcón;C. Toro;M. Frangópulos;Pablo Salgado;C. Olave;Claudia Zamora;H. Pacheco;L. Guzmán
埃森地区（43°-47 ° S）夏季容易出现有毒微藻密集繁殖，贝类中的毒素成分复杂。然而，它们的冬季分布，毒素配置文件，并在沉积物中的休眠孢囊知之甚少。常见的毒素有：麻痹性贝类毒素（PST）;亲脂性毒素，包括腹泻性贝类毒素（DST）、腹泻性贝类毒素或软骨藻酸（DA）。在2012年冬季进行的一次航行中，在24个站点采集了样本，用于浮游植物分析和软体动物毒素分析，并在5个站点采集了更多样本，用于浮游生物和沉积物中休眠包囊的毒素分析。结果证实了与毒素相关的微藻在冬季的存在，以及作为微藻分布参数的相对丰度（RA）比细胞密度更高的灵敏度。链状亚历山大藻和网状原角藻的最大RA值为2级（低）;锐尖菱形藻;伪菱形藻属3级（常规）和4级（大量）。seriata complex和Pseudo-nitzschia spp. delicatissima复合体。浮游生物中只检测到PST，软体动物中只检测到Yessotoxins，而A.悬链球和网状披碱草在沉积物中分别为4和103个孢囊mL湿沉积物。分析的参数表明，在冬季期间，更大的年际变化，因为它已报告的夏季。
The Aysén region (43°-47oS) has been prone to intensive summer blooms of toxic microalgae and complex toxin profiles in the shellfish. However, their winter distribution, toxin profile, and resting cysts in sediments are poorly known. Frequently detected toxins are: Paralytic Shellfish Toxins (PST); lipophilic toxins, including Diarrheic Shellfish Toxins (DST), Amnesic Shellfish Toxin or Domoic Acid (DA). During a cruise, carried out in winter 2012, samples were collected at 24 stations for phytoplankton analysis and analysis of toxins in mollusks, and at 5 stations, additional samples were taken for toxin analysis in plankton and resting cysts in sediments. The results confirm the presence of microalgae associated with toxins in winter, and a higher sensitivity of the relative abundance (RA) than the cellular density, as a parameter of distribution of the microalgae. The maximum RA values were level 2 (low), for Alexandrium catenella and Protoceratium reticulatum; level 1 (rare) for Alexandrium ostenfeldii, Dinophysis acuminata and D. acuta; levels 3 (regular) and 4 (abundant) for Pseudo-nitzschia spp. seriata complex and Pseudo-nitzschia spp. delicatissima complex, respectively. Only PST in plankton and yessotoxins in mo llusks were detected, whereas cyst densities of A. catenella and P. reticulatum in sediments were 4 and 103 cysts mL of wet sediment, respectively. The analyzed parameters showed a bigger inter-annual variability during the winter period, as it has been reported for the summer.