Department of Biology, Hawassa University, P.O.Box 05, Hawassa, Ethiopia.
Kotebe Metropolitan University (KMU), Addis Ababa, Ethiopia.
Bull Environ Contam Toxicol. 2022 May;108(5):830-838. doi: 10.1007/s00128-022-03497-4. Epub 2022 Mar 22.
The levels of 30 selected pesticides and trophic biomagnification of DDT were investigated in biota samples of the Lake Ziway in the Rift valley region, Ethiopia. Carbon source and trophic position were calculated by using C and N stable isotopes, individually, and trophic magnification factors (TMFs) were inferred. Only DDT and its metabolites were quantified in all samples analyzed. The most prominent metabolite was p,p'-DDE with mean concentration ranging from the 0.82-33.69 ng g lipid weight. Moreover, the ratio of DDT/DDD + DDE in all the biota samples was less than 1 signifying historical DDT application. Regression of log [ΣDDT] vs TL (trophic level) among all biota species showed a significant correlation, indicating that DDTs are biomagnifying along with the food web of Lake Ziway with an estimated TMF of 2.75. The concentrations of DDTs and other organochlorine pesticides found in biota from Lake Ziway were, in general, lower than studies found in previous studies carried out in the same lake.
研究了埃塞俄比亚裂谷地区 Ziway 湖生物群样本中 30 种选定农药的水平和滴滴涕的营养级生物放大作用。分别使用 C 和 N 稳定同位素计算碳源和营养级位置，并推断营养级放大因子（TMF）。在所有分析的样本中仅定量了滴滴涕及其代谢物。最显著的代谢物是 p,p'-DDE，其浓度范围为 0.82-33.69ng/g 脂重。此外，所有生物群样本中 DDT/DDD+DDE 的比值均小于 1，表明历史上滴滴涕的使用。所有生物种的 log [ΣDDT] 与 TL（营养水平）之间的回归显示出显著相关性，表明滴滴涕沿着 Ziway 湖的食物网生物放大，估计 TMF 为 2.75。在 Ziway 湖生物群中发现的滴滴涕和其他有机氯农药的浓度通常低于在同一湖中进行的先前研究中发现的浓度。
