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1 April 2003 Diversity of Arthropod Communities in Transgenic Bt Cotton and Nontransgenic Cotton Agroecosystems
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Abstract

In a 3-yr field experiment, possible effects of Bt transgenic cotton plants expressing cry1A(c) gene from Bacillus thrungiensis Berliner variety kurstaki on diversities of arthropod communities and pest and natural enemy sub-communities were assessed in insecticide treated and untreated cotton fields, as measured by the Shannon-Weaver diversity index. The treatments included: 1) nontransgenic cotton with no insecticide treatment (nontransgenic), 2) nontransgenic cotton with insecticide treatments (nontransgenic insecticide), 3) transgenic Bt-cotton with no insecticide treatment (Bt-cotton), and 4) transgenic Bt-cotton with insecticide treatments (Bt-cotton insecticide). The results indicated that Bt-cotton increased the diversity of arthropod communities and pest sub-communities; however, it decreased the diversities of natural enemy sub-communities. Insecticide treatments increased diversities of communities and sub-communities of arthropods in both transgenic Bt-cotton and nontransgenic cotton agroecosystems, but the increase may be an artifact of increased evenness through mortality of insecticide-targeted species.

Xingyuan Men, Feng Ge, Xianghui Liu, and Erdal N. Yardim "Diversity of Arthropod Communities in Transgenic Bt Cotton and Nontransgenic Cotton Agroecosystems," Environmental Entomology 32(2), 270-275, (1 April 2003). https://doi.org/10.1603/0046-225X-32.2.270
Received: 13 March 2002; Accepted: 1 November 2002; Published: 1 April 2003
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