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. Author manuscript; available in PMC: 2017 Mar 15.
Published in final edited form as: Environ Sci Technol. 2016 Mar 3;50(6):3256–3264. doi: 10.1021/acs.est.5b06044

Figure 3.

Figure 3

Interaction plots for internal mercury and selenium concentrations (average ng of compound/µg of protein ± SE) and internal Hg/Se ratios (average ± SE). The figure is grouped into three main sections with internal mercury concentrations are represented in the left panels (A–D), internal selenium concentrations are represented in the middle panels (E–H), and internal Hg/Se ratios in the right panels (I–L). Each of these sections contains faceted plots to represent exposure to no selenium compounds (none; A, E, I), selenate (50 mM; B, F, J), selenite (1500 µM; C, G, K), or selenomethionine (500 µM; D, H, L). The x-axis has categorically increasing mercury exposures (µM) to either HgCl2 (open circle, solid line) or MeHg (closed circle, dotted line). In the internal Hg/Se ratio section, note that the y-axis scale is different for each plot, and the red dashed line indicates a 1:1 Hg/Se ratio. In the internal mercury and selenium sections, points with at least one value above or below detection limits are indicated by OD and LOD, respectively; for a full list of sample values, see Table SI-1. For the internal mercury plots, main effects for mercury compound and concentration and their interaction were significant (p < 0.05) for each selenium exposure. For the internal selenium plots, the main effect of mercury compound was significant (p < 0.05) in the selenate plot but not (p = 0.08) in the selenite or selenomethionine plots.