title: Endogenous timing mechanism controlling the circannual pupation rhythm of the varied carpet beetle Anthrenus verbasci.
abstract: This paper describes the detailed characteristics of the circannual pupation rhythm in Anthrenus verbasci determined by laboratory experiments under various photoperiods and temperatures. The frequency distribution of larval duration showed a periodic pattern over 2-3 years and the period was 37-40 weeks under a constant short-day photoperiod (light:dark 12:12) at 20 degrees C. This rhythm showed temperature compensation to some extent under a short-day photoperiod between 17.5 degrees C and 27.5 degrees C. Under alternations of a long-day (light:dark 16:8) and a short-day photoperiod, pupation occurred 21-24.5 weeks after transfer from a long-day to a short-day photoperiod. Therefore, we concluded that the timing of pupation in A. verbasci is controlled by a circannual rhythm and its zeitgeber is a change in photoperiod. Furthermore, when larvae were transferred from a long-day to a short-day photoperiod at various ages, the larval duration after the photoperiodic transfer depended on the time of the transfer. This difference can be explained by phase-dependent phase shifts in the circannual rhythm.
authors.affiliation: Department of Bio- and Geosciences, Graduate School of Science, Osaka City University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nisimura
authors.forename: H
authors.initials: H
authors.lastname: Numata
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D001517:Coleoptera / Q000502:physiology*; D007814:Larva / Q000254:growth & development; D008675:Metamorphosis, Biological / Q000502:physiology*; D017440:Photoperiod; D011679:Pupa / Q000254:growth & development; D013696:Temperature