posted on 2019-07-29, 19:07authored byHuijuan Li, Duo Bu, Jianjie Fu, Yan Gao, Zhiyuan Cong, Guoshuai Zhang, Yawei Wang, Xiangfeng Chen, Aiqian Zhang, Guibin Jiang
Little
is currently known about the trophic transfer behavior of
short-chain chlorinated paraffins (SCCPs) in terrestrial ecosystems.
The trophodynamics of SCCPs were investigated in a typical terrestrial
food chain (plant–plateau pika–eagle) from the interior
of the Tibetan Plateau with an altitude of 4730 m. Pervasive contamination
by SCCPs was found in the Tibetan Plateau samples, and the average
concentrations of SCCPs in soil, plant, plateau pika, eagle, and gut
content of eagle samples were 81.6 ± 31.1, 173 ± 70.3, 258
± 126, 108 ± 59.6, and 268 ± 93.9 ng/g (average ±
standard deviation, dry weight, dw), respectively. The trophic magnification
factor (TMF) of SCCPs was 0.37, implying the trophic dilution of SCCPs
in this terrestrial food chain. The TMF values of individual congener
groups were positively correlated with the values of log Kow, log Koa and biotransformation
half-life. As a result of long-range transport, SCCPs congeners with
low molecular weight dominated in Tibetan Plateau species (C10+11 congeners = 76.9%, Cl5+6+7 congeners = 71.5%), which
could partly explain the low biomagnification factors (BMFs) of SCCPs
in the Tibetan Plateau.