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

Author:
Zhu, Chaofei, Wang, Pu, Li, Yingming, Chen, Zhaojing, Li, Honghua, Ssebugere, Patrick, Zhang, Qinghua, Jiang, Guibin
Source:
Environmental science 2017 v.19 no.2 pp. 154-160
ISSN:
2050-7895
Subject:
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
Abstract:
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.
Agid:
6398355