Zhang Hui, Teng Yun, Doan Tra Thi Thanh, Yat Yun Wei, Chan Sheot Harn, Kelly Barry C
Department of Civil and Environmental Engineering, National University of Singapore, Singapore.
Singapore Health Sciences Authority (HSA), Singapore, Singapore.
Environ Toxicol Chem. 2017 Sep;36(9):2521-2532. doi: 10.1002/etc.3796. Epub 2017 Apr 24.
Studies of trophodynamics and contaminant bioaccumulation in tropical marine ecosystems are limited. The present study employed stable isotope and trace contaminant analysis to assess sources of primary productivity, trophic interactions, and chemical bioaccumulation behavior in 2 mangrove food webs and 1 offshore coastal marine food web in Singapore. Samples of sediment, phytoplankton, mangrove leaves, clams, snails, crabs, worms, prawns, and fishes were analyzed for stable carbon and nitrogen isotope values, as well as concentrations of persistent organic pollutants. In the mangrove food webs, consumers exhibited similar δ C values, probably because of the well-mixed nature of these systems. However, the 2 primary consumers (common nerite and rodong snail) exhibited distinct δ C values (-21.6‰ vs -17.7‰), indicating different carbon sources. Fish from Singapore Strait exhibited similar δ C values, indicating common carbon sources in this offshore marine food web. The highest trophic level was found in glass perchlet (trophic level = 3.3) and tilapia (trophic level = 3.4) in the 2 mangrove food webs and grunter (trophic level = 3.7) in the Singapore Strait food web. Concentrations of polychlorinated biphenyl (PCB 153) and p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE) concentrations ranged from 0.9 to 84.6 ng/g lipid weight and from <0.2 to 267.4 ng/g lipid weight, respectively. The trophic magnification factors of PCB 153 and p,p'-DDE ranged between 1.63 and 4.62, indicating biomagnification in these tropical marine food webs. The findings provide important information that will aid future chemical bioaccumulation assessment initiatives. Environ Toxicol Chem 2017;36:2521-2532. © 2017 SETAC.
对热带海洋生态系统中营养动力学和污染物生物累积的研究有限。本研究采用稳定同位素和痕量污染物分析，以评估新加坡2个红树林食物网和1个近海沿海水域食物网中的初级生产力来源、营养相互作用及化学生物累积行为。分析了沉积物、浮游植物、红树林树叶、蛤蜊、蜗牛、螃蟹、蠕虫、对虾和鱼类样本的稳定碳氮同位素值以及持久性有机污染物的浓度。在红树林食物网中，消费者表现出相似的δC值，这可能是由于这些系统混合良好的特性。然而，两种初级消费者（普通黑纹玉螺和红树螺）表现出不同的δC值（-21.6‰对-17.7‰），表明碳源不同。新加坡海峡的鱼类表现出相似的δC值，表明该近海海洋食物网中有共同的碳源。在2个红树林食物网中，玻璃鲈（营养级=3.3）和罗非鱼（营养级=3.4）以及新加坡海峡食物网中的尖吻鲈（营养级=3.7）具有最高营养级。多氯联苯（PCB 153）和p,p'-二氯二苯二氯乙烯（p,p'-DDE）的浓度分别为0.9至84.6 ng/g脂重和<0.2至267.4 ng/g脂重。PCB 153和p,p'-DDE的营养放大因子在1.63至4.62之间，表明这些热带海洋食物网中存在生物放大作用。这些发现提供了重要信息，将有助于未来的化学生物累积评估工作。《环境毒理学与化学》2017年；36:2521 - 2532。© 2017 SETAC。
