Gene flow between sexual and asexual strains of parasitic wasps: A possible case of sympatric speciation caused by a parthenogenesis-inducing bacterium

Tetsuya Adachi-Hagimori, Kazuki Miura, Yoshihisa Abe

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Sympatric speciation is strictly defined as the emergence of two species from a population in which mating has been random with respect to the place of birth of the mating partners. Mathematical models have shown that sympatric speciation is possible, but very few examples have been documented in nature. In this article, we demonstrate that arrhenotokous and thelytokous strains of a parasitic wasp, Neochrysocharis formosa, speciated sympatrically through infection by a symbiotic bacterium Rickettsia for the following reasons: First, Rickettsia infection was detected in all of the thelytokous strains collected throughout Japan. Second, the arrhenotokous and thelytokous strains have been collected sympatrically. Third, crossing experiments between the two strains did not result in fertilized offspring. In addition, the two strains were genetically isolated at the nuclear and mitochondrial genes. Fourth, the two strains showed a sister relationship in nuclear 28S rRNA gene. Finally, thelytokous females treated with antibiotics produced Rickettsia-free male offspring of the same reproductive form as arrhenotokous females indicating that the thelytokous strain could have speciated sympatrically from an individual of the arrhenotokous strain.

Original languageEnglish
Pages (from-to)1254-1262
Number of pages9
JournalJournal of Evolutionary Biology
Volume24
Issue number6
DOIs
Publication statusPublished - Jun 2011

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

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