環境毒性学会誌
Online ISSN : 1882-5958
Print ISSN : 1344-0667
ISSN-L : 1344-0667
実験・調査論文
種の感受性分布による除草剤のリスク評価と河川生態調査による付着珪藻への影響評価との比較
永井 孝志 稲生 圭哉横山 淳史
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電子付録

2023 年 26 巻 p. 15-24

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The cumulative ecological risks from multiple herbicides in Japanese rivers were evaluated using species sensitivity distribution and were compared with natural periphytic diatom communities. Region-specific predicted environmental concentrations were estimated at 9 rivers considering the region-specific parameters of environmental conditions. Then the multi-substance potentially affected fraction (msPAF) was calculated as a risk index of multiple herbicides using the computation tool NIAES-CERAP. On the other hand, river ecological survey focusing on diatom community were conducted in these 9 rivers and several biological metrics for species composition were calculated such as genus number, Shannon’s diversity, DAIpo, and SPEARherbicides which is an indicator of the herbicide effect on the diatom community. DAIpo and SPEARherbicides (but the population number of each genus was not log-transformed) significantly correlated with msPAF, indicating the applicability of these metrics for assessing the effect of herbicide mixture. Moreover, the percentage of abundance for genus Planothidium and Nitzschia were significantly correlated with msPAF negatively and positively, respectively.

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