Valdespino Carolina, Huerta-Peña Aldo Israel, Pérez-Pacheco Antonio, Rendón von Osten Jaime
Instituto de Ecología, A.C., Veracruz, Mexico,
Bull Environ Contam Toxicol. 2015 Jan;94(1):17-22. doi: 10.1007/s00128-014-1398-z. Epub 2014 Oct 11.
Amphibians are good models for monitoring contaminants in ecosystems because they transfer xenobiotic substances throughout trophic networks. We quantified bioaccumulated POCs by capturing and sacrificing ninety-one frogs (Charadrahyla taeniopus and Ecnomiohyla miotympanum) from four riverine forests immersed in agriculture and pasture lands in the La Antigua, Veracruz, Mexico watershed. The concentrations of ∑DDTs, ∑HCHs, ∑Endosulphans, ∑Heptachlors, ∑Drines, and ∑Chlordanes were measured by gas chromatography and compared between species, sites and seasons. In E. miotympanum the concentration of ∑HCHs was highest at 4,746.46 μg/g, while in C. taeniopus that of the ∑DDTs was highest at 2,637.10 μg/g. Concentrations of ∑Endosulphans, ∑HCHs, ∑Chlordanes and ∑Drines differed between the two species, and were always higher in E. miotympanum. In E. miotympanum the concentration of ∑Drines differed between sites, while for C. taeniopus ∑Heptachlors differed between seasons and ∑Drines among sites. These findings indicate that the two frog species even bioconcentrate POCs that are banned and may disrupt their reproduction. The effect however may vary according to the site and the frog species.
两栖动物是监测生态系统中污染物的良好模型，因为它们能在整个营养网络中传递外源性物质。我们通过捕获并牺牲来自墨西哥韦拉克鲁斯州拉安提瓜流域四个被农业和牧场环绕的河滨森林中的91只青蛙（细纹查拉蛙和米氏鼓膜蛙），对生物累积的持久性有机污染物进行了量化。通过气相色谱法测量了∑滴滴涕、∑六氯环己烷、∑硫丹、∑七氯、∑狄氏剂和∑氯丹的浓度，并在物种、地点和季节之间进行了比较。在米氏鼓膜蛙中，∑六氯环己烷的浓度最高，为4746.46μg/g，而在细纹查拉蛙中，∑滴滴涕的浓度最高，为2637.10μg/g。两种物种之间，∑硫丹、∑六氯环己烷、∑氯丹和∑狄氏剂的浓度存在差异，且在米氏鼓膜蛙中总是更高。在米氏鼓膜蛙中，∑狄氏剂的浓度在不同地点存在差异，而对于细纹查拉蛙，∑七氯的浓度在不同季节存在差异，∑狄氏剂在不同地点存在差异。这些发现表明，这两种青蛙物种甚至会生物累积已被禁用的持久性有机污染物，可能会干扰它们的繁殖。然而，这种影响可能因地点和青蛙物种而异。
