1 oct 2011 año - "Mercury Exposure Affects the Reproductive Success of a Free-Living Terrestrial Songbird, the Carolina Wren (Thryothorus ludovicianus)" (Jackson et. al. 2011) Published

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shows bioaccumulative affect spiders, which are at a high trophic level, then affect the Carolina Wren. This is an example of point-source pollution from DuPont.
Monitored wrens along two mercury-contaminated rivers in Virginia: the North Fork Holston and South rivers contaminated by factory run-off.

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