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A toxicological risk assessment found hazard quotients for specialist dragonfly-consuming birds of up to 7.2, which is 2.4 times greater than the permissible limit of 3, suggesting a potential toxicological risk of exposure.Ībeysinghe KS, Qiu G, Goodale E, Anderson CWN, Bishop K, Evers DC, Goodale MW, Hintelmann H, Liu S, Mammides C, Quan R, Wang J, Wu P, Xu X, Yang X, Feng X (2017) Mercury flow through an Asian rice-based food web. These variations were consistent with those of nitrogen isotope (δ 15N) values, indicating that increased δ 15N, i.e., trophic levels, may reflect increased exposure and uptake of biomagnifying MeHg in dragonflies. Significant variations were observed among species, with the highest MeHg value (in Orthetrum triangulare) was fivefold higher than the lowest (in Pantala flavescens). THg and MeHg concentrations in dragonflies varied widely within ranges of 0.06–19 mg/kg (average: 1.5 ± 2.2 mg/kg) and 0.02–5.7 mg/kg (average: 0.75 ± 0.65 mg/kg), respectively. Dragonflies ( n = 439) belonging to 15 species of 8 genera were collected from an abandoned mercury (Hg) mining region in China to investigate the bioaccumulation of total Hg (THg) and methylmercury (MeHg). Dragonflies (Order Odonata) often are considered to be biosentinels of environmental contamination, e.g., heavy metals and/or persistent organic pollutants (POPs).
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