Divergent host plant specialization as the critical driving force in speciation between populations of a phytophagous ladybird beetle

K. W. Matsubayashi, S. Kahono, H. Katakura

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Detecting the isolating barrier that arises earliest in speciation is critically important to understanding the mechanism of species formation. We tested isolating barriers between host races of a phytophagous ladybird beetle, Henosepilachna diekei (Coleoptera: Coccinellidae: Epilachnine), that occur sympatrically on distinct host plants. We conducted field surveys for the distribution of the beetles and host plants, rearing experiments to measure six potential isolating factors (adult host preference, adult and larval host performance, sexual isolation, egg hatchability, F1 hybrid inviability, and sexual selection against F1 hybrids), and molecular analyses of mitochondrial ND2 and the nuclear ITS2 sequences. We found significant genetic divergence between the host races, and extremely divergent host preference (i.e. habitat isolation) and host performance (i.e. immigrant inviability), but no other isolating barriers. The fidelity to particular host plants arises first and alone can prevent gene flow between differentiating populations of phytophagous specialists.

Original languageEnglish
Pages (from-to)1421-1432
Number of pages12
JournalJournal of Evolutionary Biology
Volume24
Issue number7
DOIs
Publication statusPublished - Jul 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

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