Siriwong W, Thirakhupt K, Sitticharoenchai D, Rohitrattana J, Thongkongowm P, Borjan M, Robson M
The College of Public Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand.
Ecol Indic. 2009 Sep 1;9(5):878-882. doi: 10.1016/j.ecolind.2008.10.004.
The presence of DDT and derivatives in the food web of freshwater ecosystems of Rangsit agricultural area, Pathum Thani Province, Thailand were investigated from June 2004 to May 2007. By using gas chromatography (GC) with micro electron capture detector (mu ECD), DDT and derivatives in water, sediment, and fifteen indicator species i.e., 2 producers; Eichhornia crassipes and plankton (phyto- and zoo- plankton), an herbivore; Trichogaster microlepis (3) 3 omnivores; Trichogaster trichopterus, Oreochromis niloticus, and Puntius gonionotus, 6 carnivores; Channa striatus, Oxyeleotris marmoratus, Macrognathus siamensis, Parambassis siamensis, Anabas testudineus, and Pristolepis fasciatus, and 3 detritivores; Macrobrachium lanchesteri, Pomacea sp., and Filopaludina mertensi were measured. Results show low concentration levels (part per billion) of DDT & derivatives in each food web compartment i.e. water, sediment, aquatic plant, plankton, fish, and invertebrates. Magnification patterns, i.e. bioconcentration, bioaccumulation, and biomagnification, based on habitat and foraging behavior of selected freshwater species indicates that DDT & derivatives can accumulate and be magnified through the food chain from the lowest up to the highest trophic level. Therefore, the presence of residues and the evidence of magnification patterns can be observed as ecological indicators for evaluating ecological health risk.
2004年6月至2007年5月，对泰国巴吞他尼府兰实农业区淡水生态系统食物网中滴滴涕及其衍生物的存在情况进行了调查。通过使用配备微电子捕获检测器（μECD）的气相色谱仪（GC），对水、沉积物以及15种指示物种中的滴滴涕及其衍生物进行了测量，这15种指示物种包括：2种生产者，即凤眼莲和浮游生物（浮游植物和浮游动物）；1种草食动物，即小鳞 Trichogaster microlepis；3种杂食动物，即三星丽鱼 Trichogaster trichopterus、尼罗罗非鱼 Oreochromis niloticus 和高体波鱼 Puntius gonionotus；6种肉食动物，即条纹鳢 Channa striatus、云斑尖塘鳢 Oxyeleotris marmoratus、暹罗宽额鲈 Macrognathus siamensis、暹罗副双边鱼 Parambassis siamensis、龟壳攀鲈 Anabas testudineus 和条纹原黑丽鱼 Pristolepis fasciatus；以及3种碎屑食性动物，即兰氏沼虾 Macrobrachium lanchesteri、福寿螺 Pomacea sp. 和麦氏短沟蜷 Filopaludina mertensi。结果显示，在食物网的各个部分，即水、沉积物、水生植物、浮游生物、鱼类和无脊椎动物中，滴滴涕及其衍生物的浓度水平较低（十亿分之一）。基于所选淡水物种的栖息地和觅食行为的放大模式，即生物浓缩、生物积累和生物放大，表明滴滴涕及其衍生物可以通过食物链从最低营养级积累并放大到最高营养级。因此，残留物的存在以及放大模式的证据可作为评估生态健康风险的生态指标。
