Nfon Erick, Cousins Ian T, Broman Dag
Department of Applied Environmental Science (ITM), Frescativägen 50, Stockholm University, SE 106 91, Stockholm, Sweden.
Sci Total Environ. 2008 Jul 1;397(1-3):190-204. doi: 10.1016/j.scitotenv.2008.02.029. Epub 2008 Apr 10.
The trophic transfer of organic pollutants with varying physical chemical properties was determined in both a pelagic and benthic food chain using delta 15N as a continuous variable for assessing trophic levels. The trophic transfer of organic pollutants through the entire food chain in terms of food chain magnification factors (FCMFs) was quantified from the slope of the regression between ln [concentration] and delta 15N. Organic pollutants with statistically significant FCMFs >1 were considered to biomagnify within the food chain, whereas those with FCMFs <1 were considered to trophically dilute. Statistically significant FCMFs >1 were found for PCB congeners and organochlorine pesticides in the Baltic food chains whereas statistically significant FCMFs <1 were found for PAHs and PCNs due to trophic dilution resulting from metabolism. FCMFs were generally greater in the pelagic food chain than in the benthic food chain. However, estimated FCMFs for the benthic food chain are likely in error, as the delta 15N method suggested a food chain structure which was not consistent with the known dietary patterns of the species. Biomagnification factors (BMFs) were additionally calculated as the ratio of the lipid normalized concentrations in the predator and prey species with adjustment for trophic level and were generally consistent with the FCMFs with BMF >1 for PCBs and organochlorines.
利用δ¹⁵N作为评估营养级的连续变量，在远洋和底栖食物链中测定了具有不同物理化学性质的有机污染物的营养转移。根据ln[浓度]与δ¹⁵N之间回归的斜率，以食物链放大因子（FCMFs）来量化有机污染物在整个食物链中的营养转移。FCMFs>1且具有统计学显著性的有机污染物被认为在食物链中发生生物放大，而FCMFs<1的则被认为发生营养稀释。在波罗的海食物链中，多氯联苯同系物和有机氯农药的FCMFs>1且具有统计学显著性，而由于代谢导致的营养稀释，多环芳烃和多氯萘的FCMFs<1且具有统计学显著性。远洋食物链中的FCMFs通常比底栖食物链中的更大。然而，底栖食物链的估计FCMFs可能有误，因为δ¹⁵N方法显示的食物链结构与已知物种的饮食模式不一致。生物放大因子（BMFs）还作为捕食者和猎物物种中脂质归一化浓度的比值进行计算，并对营养级进行了调整，其结果通常与FCMFs一致，多氯联苯和有机氯的BMF>1。
