过氧化氢和赖氨酸处理对淡水蓝藻和绿藻生长的差异影响

IF 1.7 Q3 ECOLOGY
Ecologies Pub Date : 2023-06-03 DOI:10.3390/ecologies4020023
Elizabeth K. Dahedl, H. Urakawa
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引用次数: 0

摘要

有害的蓝藻繁殖产生毒素的微囊藻已成为佛罗里达州西南部淡水水体日益严重的问题。最近,2016年奥基乔比湖的水华和2018年卡卢萨哈奇河的水华都导致佛罗里达州宣布进入紧急状态。需要采取快速的抑制方法来保护居民和野生动物。过氧化氢和L-赖氨酸在选择性抑制铜绿微囊藻生长方面显示出有希望的结果,并且由于在水中的快速降解或非目标生物的生物增强,它们更具生态友好性。我们进一步探索了使用过氧化氢、L-赖氨酸和这两种化学物质的联合处理来快速抑制微囊藻毒素,这两种方法以前从未进行过测试。我们评估了在佛罗里达州常见的7种铜绿假单胞菌菌株和其他6种浮游植物(蓝藻属、聚球藻属、平核多力子藻、高相Mychonastes和嗜铬藻)的易感性,并发现易感性是多样的。所有三种处理都能有效抑制铜绿假单胞菌的生长,混合处理(16.7mg/L过氧化氢:8mg/L L-赖氨酸)最有效,在实验的最后一天,中位生长抑制率为94.2%,而过氧化氢(16.7mg/L)(83.8%)和L-赖氨素(8mg/L)(78.5%)则不那么有效。我们发现,与非性菌株相比,无菌铜绿假单胞菌对过氧化氢的敏感性明显更高(p<0.01,n=18)。实验结束时,发现L-赖氨酸对铜绿假单胞菌的毒性明显高于其他检测的蓝藻和叶绿素菌株(p<0.001,n=33),表明其对这种蓝藻的特异性,而过氧化氢和混合处理对其他检测的浮游植物有不同的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Differential Effects of Hydrogen Peroxide and L-Lysine Treatments on the Growth of Freshwater Cyanophyta and Chlorophyta
Harmful cyanobacterial blooms of the toxin-producing Microcystis have become a growing problem for Southwest Florida freshwater bodies. Recently, a 2016 bloom in Lake Okeechobee and a 2018 bloom in the Caloosahatchee River both led to the declaration of a state of emergency for the state of Florida. Fast-acting suppression methods are needed to protect residents and wildlife. Hydrogen peroxide and L-lysine have shown promising results in selectively inhibiting the growth of Microcystis aeruginosa and are more ecologically friendly due to fast degradation in water or the biological enhancement of nontarget organisms, respectively. We further explored the use of hydrogen peroxide, L-lysine, and combined treatments of both chemicals, which have never been tested before, for the rapid suppression of Microcystis. We assessed the susceptibility of seven M. aeruginosa strains and six other phytoplankton (Cyanobium spp., Synechococcus sp., Dolichospermum planctonica, Mychonastes homosphaera, and Chromochloris zofingiensis) commonly found in Florida, and revealed that susceptibility was diverse. All three treatments were effective at inhibiting the growth of M. aeruginosa, mixed treatments (16.7 mg/L hydrogen peroxide: 8 mg/L L-lysine) were most effective with a median growth inhibition ratio of 94.2% on the last day of the experiment, while hydrogen peroxide (16.7 mg/L) (83.8%) and L-lysine (8 mg/L) (78.5%) were less so. We found axenic M. aeruginosa to be significantly more sensitive to hydrogen peroxide when compared with nonaxenic strains (p < 0.01, n = 18). L-lysine was found to be significantly more toxic to M. aeruginosa than other examined cyanobacteria and chlorophyte strains at the end of the experiment (p < 0.001, n = 33), demonstrating its specificity to this cyanobacterium, while hydrogen peroxide and mixed treatments had varying effects on the other tested phytoplankton.
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