Figure 2:

Elemental concentrations (mean ± SD, ng/g wm) in the whole blood of green turtles worldwide. Data taken from Komoroske et al. (2011), Gaus et al. (2012); Camacho et al. (2014a), and Villa et al. 2017). Horizontal lines indicate thresholds as defined as: As toxicity in humans (500 ng/g, Saha et al. 1999); Cd toxicity in avian species (260 ng/g, Wayland and Scheuhammer 2011); Pb 200 ng/g is background levels in avian species and 500 ng/g is clinical poisoning in avian species (Stout et al. 2010; Franson and Pain 2011); Ni 3 ng/g to 7 ng/g is background concentration in humans (Gaus et al. 2012); Se weight loss in avian species (900 ng/g, O’Toole and Raisbeck 1997; Stout et al. 2010); and V 0.05 ng/g is the background concentration in humans (Gaus et al. 2012). Grey shaded areas are concentrations documented in green sea turtles from the Howick Islands, a relatively undisturbed region in Australia used as a reference population (Villa et al. 2017).