Relationship between Pb and Al concentration (μg/g dry weight) in (a) feces of greylag geese from three different sampling sites, and (b) feces of purple gallinule collected in Entremuros (black dotted lines represent the 95% confidence and prediction intervals and the horizontal control line shows the 34 μg/g Pb level indicative of exposure to point sources of Pb; [32], [33]).

<p>Relationship between Pb and Al concentration (μg/g dry weight) in (a) feces of greylag geese from three different sampling sites, and (b) feces of purple gallinule collected in Entremuros (black dotted lines represent the 95% confidence and prediction intervals and the horizontal control line shows the 34 μg/g Pb level indicative of exposure to point sources of Pb; <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057295#pone.0057295-MartinezHaro1" target="_blank">[32]</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057295#pone.0057295-MartinezHaro2" target="_blank">[33]</a>).