Prof. Witman asked me to put up these links. The first is a news article about rapid evolution of fish to toxins in the Hudson River, and the second is a Science podcast discussing the article.
article: http://green.blogs.nytimes.com/2011/02/18/speedy-evolution-indeed/#more-92356 and http://www.poughkeepsiejournal.com/article/20110220/NEWS01/102200362/Hudson-fish-adapts-fast-to-resist-PCBs
podcast: http://www.sciencemag.org/content/331/6019/956.2.full
