Haskins David L, Bryan Albert L
Savannah River Ecology Lab, University of Georgia, Drawer E, Aiken, SC, 29802, USA; Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, 30602, USA.
Savannah River Ecology Lab, University of Georgia, Drawer E, Aiken, SC, 29802, USA.
J Environ Radioact. 2020 Mar;213:106107. doi: 10.1016/j.jenvrad.2019.106107. Epub 2019 Nov 18.
This study sought to determine radiocesium (Cs) concentrations in two species of aquatic salamanders - the two-toed amphiuma (Amphiuma means) and the lesser siren (Siren intermedia) on the Savannah River Site. Concentrations (Cs Bq/g, dry wt) of the two species were similar at both Cs-contaminated (A. means = 0.733 ± 0.242, n = 5; S. intermedia = 0.839 ± 0.722, n = 5) and reference sites (A. means = 0.028 ± 0.020, n = 5; S. intermedia = 0.042 ± 0.027, n = 11). Salamanders captured in areas impacted by Cs contamination exhibited significantly higher Cs concentrations than individuals captured at reference sites (U = 146, p < 0.001). Salamander size (snout-vent length) was not correlated with whole-body Cs. An analysis of our data using the ERICA tool suggests that negative impacts due to Cs exposure are unlikely in these species. Overall, these data indicate that A. means and S. intermedia inhabiting contaminated sites bioaccumulate but do not biomagnify Cs.
本研究旨在测定萨凡纳河场地两种水生蝾螈——两趾两栖鲵（Amphiuma means）和小鳗螈（Siren intermedia）体内的放射性铯（Cs）浓度。在受铯污染的场地（两趾两栖鲵：0.733±0.242，n = 5；小鳗螈：0.839±0.722，n = 5）和对照场地（两趾两栖鲵：0.028±0.020，n = 5；小鳗螈：0.042±0.027，n = 11），这两种蝾螈的铯浓度（Bq/g，干重）相似。在受铯污染影响区域捕获的蝾螈，其铯浓度显著高于在对照场地捕获的个体（U = 146，p < 0.001）。蝾螈的体型（吻肛长度）与全身铯含量无关。使用ERICA工具对我们的数据进行分析表明，铯暴露对这些物种不太可能产生负面影响。总体而言，这些数据表明，栖息在受污染场地的两趾两栖鲵和小鳗螈会生物累积铯，但不会使铯生物放大。
