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首页> 外文期刊>Harmful Algae >A Toxic Pseudo-nitzschia Bloom In Todos Santos Bay, Northwestern Baja California, Mexico
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A Toxic Pseudo-nitzschia Bloom In Todos Santos Bay, Northwestern Baja California, Mexico

机译：墨西哥下加利福尼亚州西北部Todos Santos湾的有毒假性紫罗兰色绽放

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摘要

A toxic Pseudo-nitzschia spp. bloom in the Todos Santos Bay area (31.8°N), Mexico, is described. This is the southernmost report of the presence of domoic acid (DA) in the California Current System and it is also the first report of the distribution of toxic Pseudo-nitzschia species and DA on the Baja California west coast. The maximum cell abundance of Pseudo-nitzschia was 3.02 ×10~5 cells L~(-1) and the maximum concentration of DA in particulate matter (pDA) was 0.86 μg L~(-1). P. australis constituted the major proportion of cells identified as Pseudo-nitzschia. The environmental conditions associated with wind-driven upwelling were the cause for the accumulation of toxic cells. Maximum pDA and cell concentration were detected around 14 ℃. The ratio of the concentration of macronutrients seemed to be the important factor for the accumulation of P. australis. The highest cell abundance was detected in areas with a high Si(OH)_4 to N ratio in the entire water column. Therefore, the relative increase of silicate concentration related to upwelling conditions was the probable cause for the accumulation of P. australis. Maximum photosystem Ⅱ (PSⅡ) quantum efficiency of charge separation (F_v/F_m) was negatively correlated to the pDA to fucoxanthin ratio. This ratio was used in this work as an index of cellular DA content. Therefore, the photosynthetic competence of the cells might be an important factor that affected their DA cellular content.
机译：一种有毒的拟南芥属。描述了墨西哥Todos Santos湾地区（31.8°N）的水华。这是加利福尼亚州现行系统中最常见的关于杜摩酸（DA）的报道，也是关于巴下加利福尼亚州西海岸有毒假性尼兹菌属和DA分布的第一份报告。假性尼兹菌的最大细胞丰度为3.02×10〜5个细胞L〜（-1），颗粒物（pDA）中DA的最大浓度为0.86μgL〜（-1）。南极假单胞菌占被鉴定为假性尼兹菌的大部分细胞。与风流上升有关的环境条件是有毒细胞积累的原因。在14℃左右检测到最大pDA和细胞浓度。大量营养素的浓度比似乎是南极桔小球菌积累的重要因素。在整个水柱中，Si（OH）_4与N之比高的区域中检测到最高的细胞丰度。因此，与上升流条件有关的硅酸盐浓度的相对增加可能是导致南方假单胞菌积累的原因。最大光系统Ⅱ（PSⅡ）电荷分离的量子效率（F_v / F_m）与pDA与岩藻黄质的比例负相关。该比率在这项工作中用作细胞DA含量的指标。因此，细胞的光合作用能力可能是影响其DA细胞含量的重要因素。

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