Breeding ecology and seasonal abundance of the giant water bug Appasus japonicus (Heteroptera, Belostomatidae)

Shin Ya Ohba, Katsuhiko Kato, Takahisa Miyatake

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Males of the giant water bug Appasus (= Diplonychus) japonicus Vuillefroy (Belostomatidae: Heteroptera) carry egg masses on their back, but little is known about the relationship between seasonal abundance and breeding ecology of the species. In the present study, therefore, a field survey based on a mark-and-recapture census was carried out at three survey points within a rice paddy area (0.3 km2) where A. japonicus forms a meta-population in northern Okayama, Japan. We investigated the body size, seasonal abundance, dispersion, egg mass size (number of eggs within one egg mass), number of egg masses and the total eggs carried on the back of each male as fundamental parameters of the population and breeding. Significant differences in egg mass size, number of egg masses, and total number of eggs that males carried was found among the survey points. The present results suggested the possibility that the differences in breeding parameters of A. japonicus were influenced by differences in environmental factors among the microhabitats. These results are discussed in conjunction with previous reports on seasonal abundance and breeding systems in Belostomatidae bugs.

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalEntomological Science
Issue number1
Publication statusPublished - Mar 2010


  • Diplonychus
  • Endangered species
  • Mark-recapture census
  • Meta-population
  • Seasonal occurrence

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Insect Science


Dive into the research topics of 'Breeding ecology and seasonal abundance of the giant water bug Appasus japonicus (Heteroptera, Belostomatidae)'. Together they form a unique fingerprint.

Cite this