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Toxins in Transgenic Crop Byproducts May Affect Headwater Stream Ecosystems

Overview
Journal Proc Natl Acad Sci U S A
Specialty Science
Date 2007 Oct 10
PMID 17923672
Citations 34
Authors
E J Rosi-Marshall
J L Tank
T V Royer
M R Whiles
M Evans-White
C Chambers
N A Griffiths
J Pokelsek
M L Stephen
Affiliations
Soon will be listed here.
Abstract

Corn (Zea mays L.) that has been genetically engineered to produce the Cry1Ab protein (Bt corn) is resistant to lepidopteran pests. Bt corn is widely planted in the midwestern United States, often adjacent to headwater streams. We show that corn byproducts, such as pollen and detritus, enter headwater streams and are subject to storage, consumption, and transport to downstream water bodies. Laboratory feeding trials showed that consumption of Bt corn byproducts reduced growth and increased mortality of nontarget stream insects. Stream insects are important prey for aquatic and riparian predators, and widespread planting of Bt crops has unexpected ecosystem-scale consequences.

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