Circadian rhythms is one of most remarkable properties of all living
organisms from unicellulars to humans and plays an important role in
temporal synchronization of life processes and adaptation of various biological
behaviors of organisms to environmental cycles (Zera and Zhao,
2009). Many aspects of insect physiology and behavior such as daily
rhythms of locomotion, emergence of an insect larva from egg, feeding,
mating, oviposition and pupation are controlled by internal clocks. The
biological rhythms regulated by these internal clocks could be occurred
as daily, monthly, annually and, in some cases, tidal changes. Although
most of rhythmic activities of individual insects are governed by strong
endogenous components, they may also be modulated by direct effects
of environment (Saunders et al., 2002). Sometimes, it is difficult to
observe the adaptive significance of circadian rhythms. However, the
endogenous nature of circadian rhythms could be evident when the