Contribution of multiple isolating barriers to reproductive isolation between a pair of phytophagous ladybird beetles

Kei W. Matsubayashi, Haruo Katakura

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Reproductive isolation between species may often be attained by multiple isolating barriers, but the components are rarely studied in animal taxa. To elucidate the nature of multiple isolating barriers, we quantified the strength of three premating barriers, including ecologically based ones (seasonal, habitat, and sexual), two postmating-prehatching barriers (reduced egg hatchability and conspecific sperm precedence [CSP]), and one posthatching barrier, including four components of F1 hybrid reduced fitness, between two phytophagous ladybird beetles, Henosepilachna vigintioctomaculata and H. pustulosa. We detected five positive barriers (habitat isolation, sexual isolation, reduced egg hatchability, CSP, and reduced egg hatchability in backcrosses of F1 hybrids). None of these barriers entirely prevents gene exchange when it acts alone, but jointly they generate nearly complete reproductive isolation even between sympatric populations. Host fidelity contributed most strongly to reproductive isolation by reducing interspecific hybridization through several important types of ecological isolation, including microspatial, habitat, and seasonal isolation. The existence of multiple isolating barriers likely helps keep reproductive isolation stable and robust, by complementing changes in the strength of leaky barriers. This complementarity of multiple isolating barriers yields the concept of robustness of reproductive isolation, which is important when considering the long-term maintenance of species boundaries in coexisting species pairs.

Original languageEnglish
Pages (from-to)2563-2580
Number of pages18
JournalEvolution
Volume63
Issue number10
DOIs
Publication statusPublished - Oct 1 2009
Externally publishedYes

Fingerprint

Reproductive Isolation
reproductive isolation
Beetles
Coccinellidae
beetle
egg hatchability
Coleoptera
Ovum
Ecosystem
egg
sperm
Spermatozoa
habitat
habitats
spermatozoa
interspecific hybridization
complementarity
sympatry
fitness
gene

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

Cite this

Contribution of multiple isolating barriers to reproductive isolation between a pair of phytophagous ladybird beetles. / Matsubayashi, Kei W.; Katakura, Haruo.

In: Evolution, Vol. 63, No. 10, 01.10.2009, p. 2563-2580.

Research output: Contribution to journalArticle

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