Resistance to herbicide and susceptibility to herbivores: environmental variation in the magnitude of an ecological trade-off |
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Authors: | Email author" target="_blank">Aaron?J?GassmannEmail author |
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Institution: | (1) Department of Ecology and Evolution, SUNY-Stony Brook, Stony Brook, NY 11794-5245, USA;(2) Present address: Department of Entomology, University of Arizona, 410 Forbes Building, P.O. Box 210036, Tucson, AZ 85721, USA |
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Abstract: | Trade-offs can maintain genetic diversity and constrain adaptation; however, their magnitude may depend on ecological factors.
I considered whether resistance to the herbicide triazine in Amaranthus hybridus (Amaranthaceae) imposed the trade-off of increasing susceptibility to herbivorous insects. I grew triazine-resistant and
triazine-susceptible plants under contrasting levels of light and fertilization, and quantified susceptibility to herbivores
using the specialist Disonycha glabrata (Coleoptera: Chrysomelidae) and the generalist Trichoplusia ni (Lepidoptera: Noctuidae). Resistance to triazine increased susceptibility to both species of herbivorous insects, as manifested
by greater feeding preference, growth, and survival of herbivores. However, these effects were more pronounced with T. ni and for plants grown under high light. My results demonstrate the presence of a trade-off between resistance to triazine
and susceptibility to herbivorous insects that may in turn impose an ecologically based fitness cost, and illustrate the potential
for this cost to vary across environments. |
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Keywords: | Amaranthus hybridus Herbivory Photosynthesis Trade-off Triazine resistance |
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