Effects of Non-24 h Photoperiods on the Hatching Time in Metrioptera hime Furukawa (Orthoptera : Tettigoniidae)

概要

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The timing mechanism for hatching in Metrioptera hime was analyzed by exposing eggs to various non-24 h light-dark cycles. When the light (L) : dark (D) ratio was 1 : 1, the distribution of hatching eggs in relation to LD cycles was dependent on the cycle length. At 2 h-light : 2 h-dark (2L : 2D), eggs hatched in both L and D phases. In LD cycles ranging from 4L : 4D to 72L : 72D, hatching was concentrated within 2 h after light-on regardless of temperature. When the length of D exceeded 22 h, hatching peaked also 14 h after light-off. Therefore, the time measuring initiated by light-off as well as light-on determined the hatching time. No resonance effect was detected when either L or D was systematically prolonged, i.e. no free-running rhythm of hatching was observed. These time measuring systems damping are thought to be an hourglass type. At 20℃, the hatching rate was high only in a limited range of photoperiods around 12L : 12D, while it sharply decreased as either the length of L or D exceeded 48 h. At 15℃, the hatching rate was high regardless of photoperiodic conditions compared with that at 20℃.
日本昆虫学会の論文
1998-03-25