da Rosa Carlos E, de Souza Márcio S, Yunes João S, Proença Luis A O, Nery Luiz E M, Monserrat José M
Departamento de Ciências Fisiológicas, Fundação Universidade Federal do Rio Grande (FURG), R. Eng Alfredo Huch 475, Rio Grande, Brazil.
Mar Pollut Bull. 2005 Sep;50(9):956-64. doi: 10.1016/j.marpolbul.2005.04.004.
In January of 2003, a cyanobacterial bloom in the Patos' Lagoon (Southern Brazil) (32 degrees 05'S-52 degrees 12'W) was observed. Water samples were taken to identify the composition and abundance of the bloom, as well as the occurrence of toxins. The effects of this occurrence on the estuarine worm Laeonereis acuta (Polychaeta, Nereididae) was also evaluated. Predominance of cyanobacteria, particularly Anabaena trichomes ( approximately 2.5.10(6) individuals per liter) was observed, and low concentrations of microcystins and anticholinesterasic toxins were detected. Augmented levels of lipid hydroperoxides (LPO) and glutathione-S-transferase activity, and lowering of total protein content were also observed in organisms collected during the bloom event. Although non-toxic, the cyanobacterial bloom could augment the cycle of hyper-oxygenation and hypoxia in the water. During hyperoxia, L. acuta, an oxyconformer, should consume more oxygen, thus augmenting the rate of reactive oxygen species generation. A repeated cycle of hyper-oxygenation and hypoxia would finally induce oxidative stress, as evidenced by the high levels of LPO and glutathione-S-transferase activity.
2003年1月，在巴西南部的帕托斯泻湖（南纬32°05′ - 西经52°12′）观察到一次蓝藻水华。采集水样以确定水华的组成、丰度以及毒素的存在情况。还评估了此次事件对河口蠕虫锐足拉氏沙蚕（多毛纲，沙蚕科）的影响。观察到蓝藻占优势，尤其是丝状鱼腥藻（每升约2.5×10⁶个个体），并检测到低浓度的微囊藻毒素和抗胆碱酯酶毒素。在水华事件期间采集的生物中还观察到脂质过氧化（LPO）水平升高、谷胱甘肽 - S - 转移酶活性增强以及总蛋白含量降低。尽管无毒，但蓝藻水华可能会加剧水中的过氧化和缺氧循环。在高氧期间，作为氧顺应者的锐足拉氏沙蚕会消耗更多氧气，从而增加活性氧的产生速率。过氧化和缺氧的反复循环最终会诱导氧化应激，LPO和谷胱甘肽 - S - 转移酶活性的高水平证明了这一点。
