Kevin D. Floate, Gregory D. Martinsen, Thomas G. Whitham, Cottonwood Hybrid Zones as Centres of Abundance for Gall Aphids in Western North America: Importance of Relative Habitat Size, Journal of Animal Ecology, Vol. 66, No. 2 (Mar., 1997), pp. 179-188
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Floate et al. (1997) studied this question.
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