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Mercury accumulation in bats near hydroelectric reservoirs in Peninsular Malaysia

机译：马来西亚半岛水电站附近蝙蝠中的汞积累

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In large man-made reservoirs such as those resulting from hydroelectric dam construction, bacteria transform the relatively harmless inorganic mercury naturally present in soil and the submerged plant matter into toxic methylmercury. Methylmercury then enters food webs and can accumulate in organisms at higher trophic levels. Bats feeding on insects emerging from aquatic systems can show accumulation of mercury consumed through their insect prey. In this study, we investigated whether the concentration of mercury in the fur of insectivorous bat species was significantly higher than that in the fur of frugivorous bat species, sampled near hydroelectric reservoirs in Peninsular Malaysia. Bats were sampled at Temenggor Lake and Kenyir Lake and fur samples from the most abundant genera of the two feeding guilds-insectivorous (Hipposideros and Rhinolophus) and frugivorous (Cynopterus and Megaerops) were collected for mercury analysis. We found significantly higher concentrations of total mercury in the fur of insectivorous bats. Mercury concentrations also differed significantly between insectivorous bats sampled at the two sites, with bats from Kenyir Lake, the younger reservoir, showing higher mercury concentrations, and between the insectivorous genera, with Hipposideros bats showing higher mercury concentrations. Ten bats (H. cf. larvatus) sampled at Kenyir Lake had mercury concentrations approaching or exceeding 10 mg/kg, which is the threshold at which detrimental effects occur in humans, bats and mice.
机译：在大型人工水库中，例如由水力发电大坝建设而来的水库中，细菌会将天然存在于土壤和水下植物中的相对无害的无机汞转化为有毒的甲基汞。甲基汞然后进入食物网，并在营养级别较高的生物体内积累。以水生系统中出现的昆虫为食的蝙蝠可能会显示通过其猎物消耗的汞积累。在这项研究中，我们调查了马来西亚半岛水电水库附近的食虫蝙蝠皮毛中的汞浓度是否明显高于食肉蝙蝠皮毛中的汞浓度。在Temenggor湖和Kenyir湖采样了蝙蝠，并从两个食肉行会（Hipposideros和Rhinolophus）和食食性（Cynopterus和Megaerops）最丰富的公会的毛皮样本中进行了汞分析。我们发现食虫蝙蝠毛皮中的总汞浓度明显更高。在两个地点采样的食虫蝙蝠之间的汞浓度也存在显着差异，其中蝙蝠来自较年轻的水库肯耶尔湖，显示较高的汞浓度，而食虫属之间的希波塞德罗斯蝙蝠显示较高的汞浓度。在肯尼尔湖采样的十只蝙蝠（H. cf.幼虫）的汞浓度接近或超过10 mg / kg，这是对人，蝙蝠和小鼠产生有害影响的阈值。

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