Natural selection and sympatric divergence in the apple maggot Rhagoletis pomonella (original) (raw)

Nature volume 407, pages 739–742 (2000)Cite this article

Abstract

In On the Origin of Species, Darwin proposed that natural selection had a fundamental role in speciation1. But this view receded during the Modern Synthesis when allopatric (geographic) models of speciation were integrated with genetic studies of hybrid sterility and inviability2,3. The sympatric hypothesis posits that ecological specialization after a host shift can result in speciation in the absence of complete geographic isolation4,5. The apple maggot, Rhagoletis pomonella, is a model for sympatric speciation in progress4,5. Hawthorn (Crataegus spp.) is the native host for R. pomonella in N. America5. But in the mid-1800s, a new population formed on introduced, domesticated apple (Malus pumila)4,5. Recent studies6,7,8,9,10 have conferred ‘host race’ status on apple flies as a potentially incipient species, partially isolated from haw flies owing to host-related adaptation. However, the source of selection that differentiates apple and haw flies is unresolved. Here we document a gene–environment interaction (fitness trade-off) that is related to host phenology and that genetically differentiates the races.

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Acknowledgements

We thank S. Berlocher, J. Carbol, H. Dambroski, G. Dwyer, V. Gavrilovic, D. Gibbons, D. Lodge, B. Perry, D. Prokrym, U. Stolz, S. Via and the USDA lab at Niles, Michigan. This work was supported by grants from NSF (Young investigators, Integrative Research Challenges & GRT) and the USDA to J.L.F and the University of Notre Dame.

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  1. Department of Biological Sciences, Galvin Life Science Center, University of Notre Dame, Notre Dame, 46556-0169 , Indiana, USA
    Kenneth E. Filchak, Joseph B. Roethele & Jeffrey L. Feder

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  1. Kenneth E. Filchak
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  2. Joseph B. Roethele
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  3. Jeffrey L. Feder
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Correspondence toKenneth E. Filchak.

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Filchak, K., Roethele, J. & Feder, J. Natural selection and sympatric divergence in the apple maggot Rhagoletis pomonella.Nature 407, 739–742 (2000). https://doi.org/10.1038/35037578

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