Instituto Taxa Mundi, Lagoa Santa, MG, 33239, Brazil.
Laboratório de Toxicologia, Instituto de Ciências Biológicas (ICB), Universidade Federal Do Rio Grande - FURG, Rio Grande, RS, 96203-900, Brazil.
Environ Sci Pollut Res Int. 2024 Aug;31(38):50243-50260. doi: 10.1007/s11356-024-34518-w. Epub 2024 Aug 1.
Concentrations of one metalloid (As) and eight metals (Cd, Cr, Cu, Hg, Mn, Ni, Pb, and Zn) were determined in tissues (muscle, liver, and kidney) of eight snake species (Bothrops neuwiedi, Crotalus durissus, Dipsas mikanii, Epicrates crassus, Helicops modestus, Micrurus carvalhoi, Oxyrhopus guibei, and Oxyrhopus trigeminus) from Lagoa Santa Karst. Except for Cu and Zn, all other analyzed elements were detected in concentrations within the ranges previously reported for snakes inhabiting polluted areas, emphasizing Hg (specific Hg mean concentrations varied from 0.87 to 9.76 μg g d.w). The highest mean concentrations of all elements except Zn were found in muscle samples of the false corals O. guibei (means ranged from 2.01 [Pb] to 9.76 [Hg]). The highest Zn mean concentration (13.77 μg g d.w) was detected in the kidney of the water snake H. modestus. No significant correlation was found between element concentrations and body size for all species. Significant interorgan differences were observed for As, Cr, Cu, Hg, Mn, Pb, and Zn concentrations in the three tissues in H. modestus. Significant interspecific differences were found in at least one organ for all elements. Significant pairwise differences were found between diet specialist species and between these species and broader diet species, while no significant difference was found between the broader diet species. The bioaccumulation of As and metals in snakes from Lagoa Santa Karst could be associated with natural rock dissolution and erosion processes but also with the wide-scale mining in the region and the increased agriculture and urbanization.
在 Lagoa Santa 喀斯特地区采集的 8 种蛇类（Bothrops neuwiedi、Crotalus durissus、Dipsas mikanii、Epicrates crassus、Helicops modestus、Micrurus carvalhoi、Oxyrhopus guibei 和 Oxyrhopus trigeminus）的肌肉、肝脏和肾脏组织中，测定了一种类金属（砷）和八种金属（镉、铬、铜、汞、锰、镍、铅和锌）的浓度。除了铜和锌，所有其他分析元素的浓度均在先前报道的栖息在污染地区的蛇类的范围内，强调了汞（特定汞的平均浓度从 0.87 到 9.76μg g dw 不等）。除锌外，所有元素的平均浓度均最高，除锌外，所有元素的平均浓度均最高肌肉样本中的假珊瑚 O. guibei（平均值范围为 2.01 [Pb] 至 9.76 [Hg]）。在水蛇 H. modestus 的肾脏中检测到最高的 Zn 平均浓度（13.77μg g dw）。所有物种的元素浓度与体型之间均无显著相关性。在 H. modestus 的三种组织中，观察到元素浓度与组织间存在显著差异。所有元素在至少一个器官中都存在显著的种间差异。在食性专化物种之间以及这些物种与较广食性物种之间发现了显著的成对差异，但在较广食性物种之间没有发现显著差异。Lagoa Santa 喀斯特地区蛇类体内的砷和金属的生物积累可能与天然岩石溶解和侵蚀过程有关，但也与该地区的大规模采矿以及农业和城市化的增加有关。
