A Meta-Analysis of Effects of Bt Cotton and Maize on Nontarget Invertebrates 
Michelle Marvier, Chanel McCreedy, regetz [at] nceas [dot] ucsb [dot] edu (Jim Regetz), and Peter Kareiva
Science  316, 5830 (2007)
Press Release 
Nontarget Effects of Bt Crops Database This database and its accompanying metadata are now available to the public through a searchable web interface.