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Mating frequencies and production of hybrids by Rhagoletis pomonella and Rhagoletis zephyria (Diptera: Tephritidae) in the laboratory

  • Wee L. Yee (a1) and Robert B. Goughnour (a2)

Abstract

Evidence indicates low levels of hybridization in nature between the apple maggot (AM), Rhagoletis pomonella (Walsh), and snowberry maggot (SB), Rhagoletis zephyria Snow, sibling species in the R. pomonella complex. We determined the effects of AM and SB pairings on mating frequencies and production of hybrid offspring in the laboratory. Mating frequency was lowest in SB female × AM male pairings, higher in AM female × SB male and AM female × AM male pairings, and highest in SB female × SB male pairings. A greater percentage of AM female × AM male pairs produced offspring (puparia) than did AM female × SB male and SB female × AM male pairs, and a greater percentage of AM female × SB male pairs produced puparia than did SB female × AM male pairs. Male or female F1 hybrids backcrossed with AM males and with other F1 hybrids were fertile. Results suggest most R. pomonella × R. zephyria hybrids found in nature are the result of R. zephyria males mating with R. pomonella females, with few from reciprocal matings. If true, this asymmetry could lower the incidence of hybridization in nature.

Il y a des indications de faibles taux d'hybridation en nature entre la mouche de la pomme (AM), Rhagoletis pomonella (Walsh), et la mouche de la symphorine (SB), Rhagoletis zephyria Snow, des espèces-sœurs du complexe de R. pomonella (Diptera : Tephritidae). Nous déterminons les effets des appariements de R. pomonella et de R. zephyria sur les fréquences des accouplements et la production de rejetons hybrides en laboratoire. La fréquence des accouplements est la plus faible pour les appariements femelle SB × mâle AM, plus élevée pour les appariements femelle AM × mâle SB et femelle AM × mâle AM et la plus élevée pour les appariements femelle SB × mâle SB. Un plus fort pourcentage de couples femelle AM × mâle AM produit des rejetons (pupariums) que de couples femelle AM × male SB et de femelle SB × mâle AM; un plus grand pourcentage de couples femelle AM × mâle SB ont produit des pupariums que de couples femelle SB × mâle AM. Les mâles et les femelles hybrides de F1 rétrocroisés avec des mâles AM et d'autres hybrides de F1 sont fertiles. Nos résultats indiquent que la plupart des hybrides R. pomonella × R. zephyria trouvés en nature sont le résultat de l'accouplement de mâles de R. zephyria avec des femelles de R. pomonella, mais que peu proviennent des accouplements réciproques. Si cela est vrai, cette asymétrie pourrait réduire l'incidence de l'hybridation en nature.

[Traduit par la Rédaction]

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Corresponding author

1Corresponding author (e-mail: wee.yee@ars.usda.gov).

References

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Mating frequencies and production of hybrids by Rhagoletis pomonella and Rhagoletis zephyria (Diptera: Tephritidae) in the laboratory

  • Wee L. Yee (a1) and Robert B. Goughnour (a2)

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