Host fidelity is an effective premating barrier between sympatric races of the apple maggot fly

Models of sympatric speciation for phytophagous insects posit a central role for host plant-associated mating as a premating isolating mechanism in lieu of geographic barriers to gene flow. Here, by means of three mark-and-recapture studies, we confirm that host fidelity (i.e., the tendency of an in...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 1994-08, Vol.91 (17), p.7990-7994
Main Authors: Feder, J.L, Opp, S.B, Wlazlo, B, Reynolds, K, Go, W, Spisak, S
Format: Article
Language:English
Subjects:
ACCOUPLEMENT
Animal reproduction
Arithmetic mean
COPULA
CRATAEGUS
Diptera
Eclosion
EVOLUCION
EVOLUTION
FILOGENIA
GENE
Gene flow
GENES
Host plants
Host preferences
HOTE
HUESPEDES
Insect genetics
Insects
MALUS PUMILA
Phenotypic traits
PHYLOGENIE
PREFERENCE ALIMENTAIRE
PREFERENCIAS ALIMENTARIAS
RACE
Ratios
RAZAS
RHAGOLETIS POMONELLA
Speciation
Tephritidae
Trees
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Summary:Models of sympatric speciation for phytophagous insects posit a central role for host plant-associated mating as a premating isolating mechanism in lieu of geographic barriers to gene flow. Here, by means of three mark-and-recapture studies, we confirm that host fidelity (i.e., the tendency of an insect to reproduce on the same host species that it used in earlier life-history stages) restricts gene flow between sympatric apple- and hawthorn-infesting races of Rhagoletis pomonella (Diptera: Tephritidae) to approximately 6% per generation. Genetically based differences in host preference, adult eclosion under the "correct" host species, and allochronic isolation contribute to host fidelity in various degrees in the races. The results verify that host-associated adaptation can produce reproductive isolation as a correlated character (a key premise of sympatric speciation). The study also represents one of the few or perhaps only example in animals where the intra-specific isolating effects of specific phenotypes have been quantified in nature
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.91.17.7990