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Trophic transfer of hexabromocyclododecane in the terrestrial and aquatic food webs from an e-waste dismantling region in East China

Zhu, Chaofei, Wang, Pu, Li, Yingming, Chen, Zhaojing, Li, Honghua, Ssebugere, Patrick, Zhang, Qinghua, Jiang, Guibin
Environmental science 2017 v.19 no.2 pp. 154-160
Ampullariidae, Ctenopharyngodon idella, Pantala, Rattus norvegicus, aquatic ecosystems, aquatic food webs, aquatic organisms, electronic wastes, hexabromocyclododecane, isomers, lipids, rats, soil food webs, terrestrial ecosystems, trophic levels, uncertainty, China
Trophic transfer of hexabromocyclododecane (HBCD) was investigated in both the terrestrial and aquatic food webs from an e-waste dismantling region in East China. The mean Σ₃HBCD concentrations in the terrestrial species varied from 0.91 (0.16–1.85) ng g⁻¹ lipid weight (lw) in dragonflies (Pantala flavescens) to 40.3 (22.1–51.1) ng g⁻¹ lw in rats (Rattus norvegicus). The isomeric profile indicated that α-HBCD presented a decreasing trend along the trophic level (TL) (from 97.2% to 16.3% of Σ₃HBCDs), while γ-HBCD showed a reverse trend (from 2.8% to 73.6% of Σ₃HBCDs). The trophic magnification factor (TMF) derived from the slope of the regression line between TLs and ln-transferred Σ₃HBCDs was 0.10, suggesting a trophic dilution of HBCD in the terrestrial food web. By contrast, in the aquatic species, Σ₃HBCD concentrations varied from 5.02 (3.5–6.55) ng g⁻¹ lw in apple snails (Ampullaria gigas spix) to 45.9 (14.9–67.8) ng g⁻¹ lw in grass carps (Ctenopharyngodon idellus). α-HBCD was the dominant isomer, followed by γ-HBCD in the majority of species. A positive linear relationship was observed in the plots of ln Σ₃HBCDs versus TLs (R² = 0.81, p = 0.06). The TMF for Σ₃HBCDs was 6.36, indicating a trophic magnification of HBCD in the aquatic food web. Although these results demonstrated the distinct trophic transfer of Σ₃HBCDs in different ecosystems, further research is needed to eliminate the uncertainty of the tendencies, due to the non-significant relationship and limited species.