Field realistic doses of pesticide imidacloprid reduce bumblebee pollen foraging efficiency
Field realistic doses of pesticide imidacloprid reduce bumblebee pollen foraging efficiency
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DOI：
10.1007/s10646-014-1189-7
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发表时间：
2014-04-01
期刊：
影响因子：
2.7
通讯作者：
Goulson, Dave
中科院分区：
文献类型：
--
作者：
Feltham, Hannah;Park, Kirsty;Goulson, Dave
熊蜂和其他授粉媒介为农业部门提供重要的生态系统服务。然而，最近的研究表明，开花作物接触内吸性新烟碱类杀虫剂对大黄蜂劳动力具有亚致死作用，从而减少蜂王产量。然而，巢穴性能下降背后的机制仍不清楚。在这里，我们使用射频识别 (RFID) 技术来测试暴露于低、现场实际剂量（糖水中 0.7 ppb，花粉中 6 ppb）的新烟碱类吡虫啉是否会降低工人的觅食效率。虽然用吡虫啉处理的蜜蜂的花蜜采集效率与对照蜜蜂没有显着差异，但经过处理的蜜蜂带回花粉的频率低于对照蜜蜂（分别为 40% 和 63%），并且在收集花粉的情况下，经过处理的蜜蜂每小时带回的花粉比对照蜜蜂少 31%。这项研究表明，这些农药的实际剂量会严重影响熊蜂工蜂在收集花粉时的觅食能力，我们认为这提供了吡虫啉暴露蜂群中蜂王产量减少的因果机制。
Bumblebees and other pollinators provide a vital ecosystem service for the agricultural sector. Recent studies however have suggested that exposure to systemic neonicotinoid insecticides in flowering crops has sub-lethal effects on the bumblebee workforce, and hence in reducing queen production. The mechanism behind reduced nest performance, however, remains unclear. Here we use Radio Frequency Identification (RFID) technology to test whether exposure to a low, field realistic dose (0.7 ppb in sugar water and 6 ppb in pollen) of the neonicotinoid imidacloprid, reduces worker foraging efficiency. Whilst the nectar foraging efficiency of bees treated with imidacloprid was not significantly different than that of control bees, treated bees brought back pollen less often than control bees (40 % of trips vs 63 % trips, respectively) and, where pollen was collected, treated bees brought back 31 % less pollen per hour than controls. This study demonstrates that field-realistic doses of these pesticides substantially impacts on foraging ability of bumblebee workers when collecting pollen, and we suggest that this provides a causal mechanism behind reduced queen production in imidacloprid exposed colonies.