朱小奕^1,2,
陈瑾^1,2,
张建英^1,2,,
1. 浙江大学 环境科学研究所, 杭州 310058;
2. 浙江省有机污染过程与控制重点实验室, 杭州 310058

作者简介: 朱小奕(1990-),女,硕士研究生,研究方向为水生态毒理学,E-mail:21414020@zju.edu.cn.

通讯作者: 张建英,zjy@zju.edu.cn

基金项目: 国家自然科学基金项目(21177106,21477103)


中图分类号: X171.5

Assessing Ecological Risk of Cyanotoxins Based on Interspecies Correlation Estimation and Species Sensitivity Distributions

Zhu Xiaoyi^1,2,
Chen Jin^1,2,
Zhang Jianying^1,2,,
1. Environmental Science Institute, Zhejiang University, Hangzhou 310058, China;
2. Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China

Corresponding author: Zhang Jianying,zjy@zju.edu.cn

CLC number: X171.5

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摘要:藻毒素对人体的健康风险已受普遍关注,然而其对水生态物种敏感性分布的影响尚不明朗。本研究采集已有实验数据,利用种间相关性分析(ICE)模型和物种敏感性分布评估(SSDs)方法,筛选了64个水生生物物种的71组急性毒性数据(EC₅₀),构建水生生物对肝毒素(节球藻毒素、柱孢藻毒素)和神经毒素(类毒素、贝毒素)的SSD方程。在此基础上,计算不同暴露浓度下的潜在影响比例(PAF)以及保护95%物种基础上藻毒素对水生生物的生态风险阈值(HC₅),比较不同类别生物对藻毒素的敏感性以及藻毒素对水生生物的生态风险。结果表明:(1)在95%物种保护保证率下,节球藻毒素、柱孢藻毒素、类毒素和贝毒素对全部物种的HC₅值分别为74.96、205.39、194.39、0.3 μg·L^-1,贝毒素水生态风险最高,柱孢藻毒素最低。(2)柱孢藻毒素、类毒素对无脊椎动物的HC₅值分别为122.93、95.19 μg·L^-1,低于全部物种的HC₅值,无脊椎动物受柱孢藻毒素、类毒素影响较其他物种大。(3)物种潜在影响比例可明确表征敏感性,柱孢藻毒素、类毒素在各浓度暴露情景下对无脊椎动物的PAF值均高于脊椎动物,显示无脊椎动物的敏感性较高。
关键词: 藻毒素/
水生生物/
物种敏感性分布/
生态阈值

Abstract:The risk of cyanotoxins to human health has been widely concerned. However, their effect on aquatic species sensitivity distribution was not well understood. This study aimed to assess the ecological risks of two typical cyanobacterial hepatotoxins (nodularins, cylindrospermopsin) and two typical cyanobacterial neurotoxins (anatoxin-a, saxitoxins) by employing the interspecies correlation estimation (ICE) and species sensitivity distributions (SSDs) models. SSDs were constructed based on 71 available sets of acute toxicity data covering 64 aquatic organisms exposure to cyanotoxins. The potentially affected fractions (PAF) under various concentrations and the hazardous concentrations for 5% of the species (HC₅) were calculated and compared among different aquatic species. Results show that the estimated HC 5 values for nodularins, cylindrospermopsin, anatoxin-a and saxitoxins were 74.96 μg·L^-1, 205.39 μg·L^-1, 194.39 μg·L^-1and 0.3 μg·L^-1, respectively, suggesting that the hazardous risk of species is assessed at higher and lower level for saxitoxins and cylindrospermopsin. The invertebrates exposure to cylindrospermopsin and anatoxin-a presented lower HC₅ than that of the all aquatic organisms with 122.93 μg·L^-1 and 95.19 μg·L^-1, respectively, which indicate that cylindrospermopsin and anatoxin-a cause more damage to invertebrates than other species. The PAF of 10-1000 μg·L^-1cylindrospermopsin and anatoxin-a to invertebrates were higher than that of vertebrates, suggesting that invertebrates are more sensitive to cylindrospermopsin and anatoxin-a than vertebrates.
Key words:cyanotoxins/
aquatic organisms/
species sensitivity distributions/
ecological threshold.