Zamora-Barrios Cesar Alejandro, Rodríguez Marcos Efrén Fragoso, Nandini S, Sarma S S S
Laboratory of Water Pollutants Removal Processes, Division of Research and Postgraduate Studies, Universidad Nacional Autónoma de México, FES-Iztacala, Tlalnepantla 54090, State of Mexico, Mexico.
Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, Universidad Nacional Autónoma de México, FES-Iztacala, Tlalnepantla 54090, State of Mexico, Mexico.
Toxins (Basel). 2025 Jun 2;17(6):277. doi: 10.3390/toxins17060277.
Freshwater cyanobacterial harmful algal blooms (FCHABs) alter zooplankton communities, often adversely, through the production of cyanotoxins. While is frequently used to evaluate the impact of toxicants, it is not commonly found in tropical waters; cladocerans from tropical and subtropical waterbodies should be used in bioassays. Here, we evaluated the impact of crude cyanobacteria extracts on three common, native species (, , and ) based on acute and chronic bioassays. We analyzed the toxicity of cyanobacterial consortium collected from Lake Zumpango, Mexico. The FCHAB was dominated by (1.16 × 10 ind mL). A series of freeze/thaw/sonification cycles at 20 kHz was used to extract the toxic metabolites and the concentration of dissolved microcystin-LR equivalents was measured using an ELISA immunological kit. was the most sensitive species, with a median lethal concentration of 0.43 compared to 1.19 µg L of at 48 h. was also the most sensitive in chronic evaluations, showing a negative rate of population increase (-0.10 d) in experiments with 20% crude extract.
淡水蓝藻有害藻华（FCHABs）通过产生蓝藻毒素改变浮游动物群落，这种改变通常是负面的。虽然[某种生物]经常被用于评估有毒物质的影响，但在热带水域并不常见；生物测定中应使用来自热带和亚热带水体的枝角类动物。在这里，我们基于急性和慢性生物测定评估了蓝藻粗提物对三种常见本地物种（[物种1]、[物种2]和[物种3]）的影响。我们分析了从墨西哥祖潘戈湖采集的蓝藻聚集体的毒性。该淡水蓝藻有害藻华以[某种蓝藻]为主（1.16×10[单位] mL）。使用一系列20 kHz的冻融/超声处理循环来提取有毒代谢物，并使用ELISA免疫试剂盒测量溶解的微囊藻毒素-LR当量的浓度。[物种1]是最敏感物种，在48小时时的半数致死浓度为0.43，而[另一种物质]为1.19 µg L。在慢性评估中，[物种1]也是最敏感的，在使用20%粗提物的实验中显示出种群增长率为负（-0.10 d）。
