Journal of Insect Behavior

, Volume 14, Issue 4, pp 421–432

Diurnal Periodicity of Death-Feigning in Cylas formicarius (Coleoptera: Brentidae)

  • Takahisa Miyatake

DOI: 10.1023/A:1011196420147

Cite this article as:
Miyatake, T. Journal of Insect Behavior (2001) 14: 421. doi:10.1023/A:1011196420147


Diurnal periodicity of death-feigning behavior, or thanatosis, was found in adults of the sweet potato weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae). The proportion of death-feigned weevils was significantly lower at night than in the daytime only in males. The duration of death-feint was shorter at night than in the daytime in both sexes. The influences of a weevil's behavior prior to being startled (prestimulus behavior) on the proportion of adults feigning death and on the duration of the death-feint were examined. Resting weevils feigned death more frequently and took a longer duration to recover compared to walking ones. The results suggest that, in general, death-feigning is less frequent in active weevils compared to inactive ones. A cost–benefit relationship of death-feigning behavior is discussed in relation to survival and reproduction of C. formicarius.

death feigningdefensediurnal rhythmsweet potato weevilthanatosis

Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Takahisa Miyatake
    • 1
  1. 1.Laboratory of Animal Population Ecology, Faculty of AgricultureOkayama UniversityOkayamaJapan