Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
Sci Total Environ. 2020 Nov 15;743:140627. doi: 10.1016/j.scitotenv.2020.140627. Epub 2020 Jul 3.
Neonicotinoid insecticides pose risks that need to be managed for conservation of aquatic ecosystems. In this study, we evaluated the associations between the estimated environmental concentrations of two neonicotinoid insecticides (imidacloprid and dinotefuran) and the total abundances of seven functional feeding groups (FFGs) of benthic invertebrate communities in rivers in urban rice-paddy areas in four Japanese regions. Regional datasets of benthic invertebrate communities and environmental variables available for Japan were analyzed. The associations between neonicotinoid exposure and benthic functional groups in each region were evaluated by applying a partial redundancy analysis to each regional dataset. We then examined whether there was an interregionally consistent pattern in the observed associations to ascertain the general applicability of the associations. In two of the four regions, the associations of the total abundances of the seven FFGs with neonicotinoid concentrations were significant, suggesting negative effects of imidacloprid and dinotefuran on river ecosystem functions in these two Japanese regions. Moreover, although the associations in the remaining two regions were not significant, the pattern of associations of the total abundances of six of the FFGs (shredders, filter feeders, collectors, grazers, predators, and scavengers) with imidacloprid concentrations seemed to be consistent among the four regions. This implies broad-scale negative effects of imidacloprid on river ecosystem functions in urban rice-paddy areas. We did not, however, find any interregionally consistent patterns in the associations with dinotefuran concentrations. This may be related to the multicollinearity with the imidacloprid concentrations and/or the low maximum dinotefuran concentration relative to the toxicity values of this neonicotinoid. Therefore, the association between dinotefuran and river ecosystem functions requires additional investigation. We believe that this type of hypotheses-generating research using country-wide biomonitoring and exposure databases can be a great aid in future ecological risk assessment studies.
新烟碱类杀虫剂对水生生态系统的保护构成了风险，需要加以管理。在本研究中，我们评估了两种新烟碱类杀虫剂（吡虫啉和噻虫嗪）的估计环境浓度与日本四个地区城市稻田河流中底栖无脊椎动物群落七个功能摄食群（FFG）的总丰度之间的关系。分析了日本现有的底栖无脊椎动物群落和环境变量的区域数据集。通过对每个区域数据集应用部分冗余分析，评估了新烟碱类暴露与底栖功能群之间的关系。然后，我们检验了在观察到的关联中是否存在区域间一致的模式，以确定关联的普遍适用性。在四个地区中的两个地区，七个 FFG 总丰度与新烟碱类浓度之间的关联具有统计学意义，表明吡虫啉和噻虫嗪对这两个日本地区河流生态系统功能有负面影响。此外，尽管在其余两个地区的关联不具有统计学意义，但六个 FFG（碎食者、滤食者、收集者、食草动物、捕食者和清道夫）的总丰度与吡虫啉浓度之间的关联模式似乎在四个地区之间是一致的。这意味着吡虫啉对城市稻田地区河流生态系统功能具有广泛的负面影响。然而，我们没有发现与噻虫嗪浓度之间存在任何区域间一致的关联模式。这可能与吡虫啉浓度的多重共线性和/或该新烟碱类的毒性值相对较低的噻虫嗪最大浓度有关。因此，噻虫嗪与河流生态系统功能之间的关联需要进一步研究。我们认为，使用全国范围内的生物监测和暴露数据库进行这种生成假设的研究，可以为未来的生态风险评估研究提供很大的帮助。
