Costs of mating and egg production in female Callosobruchus chinensis

Shin Ichi Yanagi, Takahisa Miyatake

Research output: Contribution to journalArticle

62 Citations (Scopus)


Costs of reproduction include the costs of mating and egg production. Specific techniques such as irradiation or genetic mutation have been used to divide the expense into costs of mating and egg production in previous studies. We tried to divide the costs in the adzuki bean beetle, Callosobruchus chinensis (Coleoptera: Bruchidae), which needs some kinds of bean as an oviposition substrate. Mated females that were not allowed to lay eggs had a shorter life span than virgin females, but they had a longer life span than mated females that were allowed to lay eggs. The results showed two independent significant costs, mating and egg production, on the life span in C. chinensis. Costs of mating, however, include the costs of sexual harassment by males and copulation itself, and we need further studies to divide the costs. The present method for dividing the cost of reproduction into costs of mating and egg production can be applied to a broad taxonomic range of insect species, and thus it will be a useful model system for inter-specific comparisons of costs of mating and egg production.

Original languageEnglish
Pages (from-to)823-827
Number of pages5
JournalJournal of Insect Physiology
Issue number9
Publication statusPublished - Sep 1 2003



  • Bean beetle
  • Callosobruchus chinensis
  • Cost of mating
  • Cost of reproduction
  • Life span
  • Survival

ASJC Scopus subject areas

  • Insect Science
  • Physiology

Cite this