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The "hybrid bridge" hypothesis: host shifting via plant hybrid swarms

Floate, K. D. and Whitham, T. G. (1993) The "hybrid bridge" hypothesis: host shifting via plant hybrid swarms. American Naturalist, 141 (4). pp. 651-662. ISSN 0003-0147

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Abstract

Based on studies of insect distributions on Fremont cottonwood (Populus fremontii), narrowleaf cottonwood (P. angustifolia) and natural hybrids resulting from crosses between them in Utah, the hybrid bridge hypothesis is proposed. This hypothesis argues that the presence of plant hybrid intermediates facilitates host shifting by herbivores such that host shifting is more likely to occur in their presence than in their absence. It is predicted that: (1) host shifting will be affected by the pattern of plant hybridization as this determines the degree to which hybrid genotypes span the genetic gap between plant species; (2) monophagous herbivores are more likely than polyphagous herbivores to benefit from the presence of a hybrid bridge for host shifting; and (3) hybridizing plant species will share more herbivores than non-hybridizing species.

Item Type: Article
Publisher’s Statement: © 1993 by The University of Chicago, 0003-0147/93/4104-0009$02.00. All rights reserved.
Keywords: AMERICA; angiosperms; Animals; APEC countries; arthropods; bridging; broadleaves; Developed Countries; dicotyledons; eukaryotes; Evolution; Forests and Forest Trees (Biology and Ecology) (KK100); forest trees; Hexapoda; HOST plants; hostplants; host range; Hybridization; hybrids; insect pests; INSECTS; Invertebrates; Mountain States of USA; North America; OECD Countries; pest insects; Pests, Pathogens and Biogenic Diseases of Plants (FF600) (Discontinued March 2000); plant hosts; PLANTS; Populus; Populus angustifolia; Populus angustifolia x P. fremontii; Populus fremontii; Salicaceae; Salicales; Spermatophyta; Taxonomy and Evolution (ZZ380); trees; United States of America; USA; UTAH; Western States of USA; WOODY plants
Subjects: Q Science > QH Natural history > QH301 Biology
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Biological Sciences
Date Deposited: 24 Aug 2015 19:58
URI: http://openknowledge.nau.edu/id/eprint/68

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