Takashi Kuraku, Tasuku Nawaji, Hiromi Andoh, N. Yakata, Masanori Seki
{"title":"Chronic Effects on Emergence Ratio and Development Rate of Chironomus yoshimatsui Exposed to Carbendazim in a Sediment-water Exposure System","authors":"Takashi Kuraku, Tasuku Nawaji, Hiromi Andoh, N. Yakata, Masanori Seki","doi":"10.2965/jswe.43.127","DOIUrl":null,"url":null,"abstract":"Carbendazim is the hydrolysate of benomyl and thiophanate-methyl, which are the active ingredients of pesticides, in the environment. Carbendazim has been detected in environmental water and sediment in Japan, and there is concern that it may have chronic effects on benthic organisms living in aquatic environments. In this study, the Japanese native chironomids Chironomus yoshimatsui were exposed to carbendazim from the first instar larval stage to emergence using a sediment-water system prepared by spiking carbendazim into the sediment. During exposure, the emergence ratio and development rate of C. yoshimatsui were measured. As a result, the no-observed-effect concentration based on the sediment concentration ( NOEC sed ) of carbendazim for C. yoshimatsui was 3.07 mg kg -1 , which was 170 times higher than the highest concentration of 0.018 mg kg -1 in the Japanese environmental sediment. Therefore, it is necessary to consider the results of this study when evaluating the toxicities of benomyl and thiophanate-methyl in sediment in the future.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"11 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Japan Society on Water Environment","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2965/jswe.43.127","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Carbendazim is the hydrolysate of benomyl and thiophanate-methyl, which are the active ingredients of pesticides, in the environment. Carbendazim has been detected in environmental water and sediment in Japan, and there is concern that it may have chronic effects on benthic organisms living in aquatic environments. In this study, the Japanese native chironomids Chironomus yoshimatsui were exposed to carbendazim from the first instar larval stage to emergence using a sediment-water system prepared by spiking carbendazim into the sediment. During exposure, the emergence ratio and development rate of C. yoshimatsui were measured. As a result, the no-observed-effect concentration based on the sediment concentration ( NOEC sed ) of carbendazim for C. yoshimatsui was 3.07 mg kg -1 , which was 170 times higher than the highest concentration of 0.018 mg kg -1 in the Japanese environmental sediment. Therefore, it is necessary to consider the results of this study when evaluating the toxicities of benomyl and thiophanate-methyl in sediment in the future.
多菌灵是环境中杀虫剂的有效成分苯甲酰和噻吩-甲基的水解产物。在日本的环境水和沉积物中检测到多菌灵,人们担心它可能对生活在水生环境中的底栖生物产生慢性影响。本研究采用多菌灵灌入沉积物制备的沉积物-水系统,将日本本土的吉松Chironomus chonomus yoshimatsui从一龄幼虫期开始暴露于多菌灵中直至羽化。在暴露过程中,测定了吉松c的羽化率和发育率。结果表明,多菌灵对吉松木菇的无观测效应浓度(NOEC sed)为3.07 mg kg -1,是日本环境沉积物中最高浓度0.018 mg kg -1的170倍。因此,今后在评价苯甲酰和甲基硫代盐在沉积物中的毒性时,有必要考虑本研究结果。