PNAS - Genes From Bt Pesticides Now Commonplace In Midwestern Streams

Common sense tells us that, following corn harvest, fragments of corn cobs, leaves, stalks, silk, and pollen may be blown by the wind or carried across the land surface by runoff. Corn plant residues will end up in the sediments of streams lakes and reservoirs. Scientists call the result detritus. The rest of us call it 'muck.' It follows that if most of the corn being grown is genetically modified ("GM") to contain toxic levels of Bt pesticide, as is currently the case throughout the corn belt, Bt residues are 'in the muck' - so to speak.

Are Bt pesticide residues in river muck of sufficient concentration to be toxic? Based on recent stream sampling done in Indiana, the exposure to pesticides of aquatic organisms could indeed be high - potentially impacting several of the thousands of chironomidae (aquatic insect) species found in North American streams ponds and lakes.

EDIT

http://www.treehugger.com/files/2010/12/pesticidal-proteins-from-gm-corn-plant-residue-found-common-midwest-streams.php?campaign=th_rss

Sorry, the link they supplied to the PNAS study didn't work - will check back later.