The "hybrid bridge' hypothesis

host shifting via plant hybrid swarms

K. D. Floate, Thomas G Whitham

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

Discusses mechanisms by which herbivorous insects acquire or shift to new host plants without involving preadaptation or mutation. The authors use their work on insect distributions on cottonwood trees to suggest the potential importance of hybrid plants that morphologically, genetically and spatially bridge gaps between parental species and which may allow herbivores to shift hosts in a series of gradual steps. Predictions are 1) monophages are more likely to benefit from a hybrid bridge than polyphages; 2) hybridising plants will share more herbivores than non-hybridising species; and 3) the pattern of hybridisation allows for specific predictions. The "hybrid bridge' hypothesis is tested using galling insects on Fremont cottonwood Populus fremontii × narrowleaf cottonwood Populus angustifolia hybrids in N Utah. -P.J.Jarvis

Original languageEnglish (US)
Pages (from-to)651-662
Number of pages12
JournalAmerican Naturalist
Volume141
Issue number4
DOIs
StatePublished - 1993
Externally publishedYes

Fingerprint

swarms
Populus angustifolia
Populus fremontii
insect
herbivore
herbivores
insects
prediction
phytophagous insects
host plant
mutation
hybridization
host plants

ASJC Scopus subject areas

  • Ecology

Cite this

The "hybrid bridge' hypothesis : host shifting via plant hybrid swarms. / Floate, K. D.; Whitham, Thomas G.

In: American Naturalist, Vol. 141, No. 4, 1993, p. 651-662.

Research output: Contribution to journalArticle

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