This is an interesting story on the effects of stormwater runoff on Salmon in urban creeks. Researchers found that urban runoff can apparently be acutely toxic to salmon. It's an important bit of work in that it confirms the obvious, and should lead to more badly needed research on this topic.
http://seattlepi.nwsource.com/local/107460_coho06.shtml
http://seattlepi.nwsource.com/local/107460_coho06.shtml