Abstract
Global pesticide usage reaching 2.7 million metric tons annually, brings a grave threat to non-target organisms, especially aquatic organisms, resulting in serious concerns. Predicting aquatic toxicity of pesticides towards Daphnia magna is significant. In this work, random forest (RF) algorithm, together with ten Dragon molecular descriptors, was successfully utilized to develop a quantitative structure–activity/toxicity relationship (QSAR/QSTR) model for the toxicity pEC50 of 745 pesticides towards Daphnia magna. The optimal QSTR model (RF Model I) based on the RF parameters of ntree = 50, mtry = 3 and nodesize = 5, yielded R2 = 0.877, MAE = 0.570, rms = 0.739 (training set of 596 pEC50), R2 = 0.807, MAE = 0.732, rms = 0.902 (test set of 149 pEC50), and R2 = 0.863, MAE = 0.602, rms = 0.774 (total set of 745 pEC50), which are accurate and satisfactory. The optimal RF model is comparable to other published QSTR models for Daphnia magna, although the optimal RF model possessed a small descriptor subset and dealt with a large dataset of pesticide toxicity pEC50. Thus, the investigation in this work provides a reliable, applicable QSTR model for predicting the toxicity pEC50 of pesticides towards Daphnia magna.
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Acknowledgements
The authors wish to express their sincere thanks to Professor Xinliang Yu at Hunan Institute of Engineering for his guidance.
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C.C., B.W. and M.L: data curation, software. S.H.: conceptualization, methodology, software, writing – original draft, writing – review & editing. X.H.: writing – review & editing.
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Chen, C., Yang, B., Li, M. et al. Quantitative structure–activity relationship predicting toxicity of pesticides towards Daphnia magna. Ecotoxicology (2024). https://doi.org/10.1007/s10646-024-02751-1
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DOI: https://doi.org/10.1007/s10646-024-02751-1