栖息于卡罗来纳湾湿地的两栖类幼虫的膳食汞暴露与生物累积。
Dietary mercury exposure and bioaccumulation in amphibian larvae inhabiting Carolina bay wetlands.
作者信息
Unrine J M, Jagoe C H, Brinton A C, Brant H A, Garvin N T
机构信息
Savannah River Ecology Laboratory, The University of Georgia, P.O. Drawer E, Aiken, SC 29803, USA.
出版信息
Environ Pollut. 2005 May;135(2):245-53. doi: 10.1016/j.envpol.2004.11.003.
Inorganic mercury and methylmercury concentrations were measured both in guts and remaining carcasses of southern leopard frog (Rana sphenocephala) larvae from 10 Carolina bay wetlands in South Carolina, USA. Significant variation among bays in methylmercury and inorganic mercury concentrations existed both in guts and carcasses. There was a moderate negative correlation between dissolved organic carbon concentration in bays and mean inorganic mercury concentrations in guts. There was also a weak positive correlation between pH in bays and mean methylmercury concentrations in carcasses. The ratio of methylmercury to inorganic mercury decreased with increasing total mercury concentration in guts and in larvae, but the rate of decrease was highly variable among bays. Ratios of concentrations in carcasses to concentrations in guts were inversely related to gut concentration. Mercury concentrations in carcasses in some bays were within the range of concentrations at which adverse effects have been observed in laboratory studies of R. sphenocephala.
在美国南卡罗来纳州10个卡罗来纳湾湿地的南方豹蛙（Rana sphenocephala）幼体的肠道和剩余尸体中，均测量了无机汞和甲基汞的浓度。海湾之间甲基汞和无机汞浓度在肠道和尸体中均存在显著差异。海湾中溶解有机碳浓度与肠道中平均无机汞浓度之间存在中度负相关。海湾中的pH值与尸体中平均甲基汞浓度之间也存在微弱的正相关。甲基汞与无机汞的比例随着肠道和幼体中总汞浓度的增加而降低，但降低速率在不同海湾之间变化很大。尸体中浓度与肠道中浓度的比例与肠道浓度呈负相关。在一些海湾中，尸体中的汞浓度处于在南方豹蛙的实验室研究中已观察到不利影响的浓度范围内。
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