Locomotor Activity Rhythm of Velarifictorus grylloides(Orthoptera:Gryllidae)
17 , 2018-02-28 , 山口県立大学
Locomotor activity rhythm of adult Velarifictorus grylloides(Orthoptera:Gryllidae) was examined females and males at 28ºC, 12L: 12D. Locomotor activities were most often observed during the dark period. However,some individuals commenced activity several hours before the transition from light to dark, some were fairly active during the light period, and some synchronized the end but not the start of activity with the light/dark cycle: there were notable individual differences. The locomotor activity pattern of one individual may be closely synchronized with the light/dark cycle from beginning to end, but another individual may show changes in its activity pattern between cycles. The degree of synchronization with light and dark periods differed between individuals. Activity during the 24 hours before death was continuous, regardless of light and dark periods, and in many individuals the amount of activity suddenly increased. Activity levels for females were twice as high as those for males, and the duration of their daily activity was also longer.