Leading experts in the field bring together diverse aspects of
insect timing mechanisms. This work combines three topics that are
central to the understanding of biological timing in insects:
circadian rhythms, photoperiodism, and diapause. The common theme
underlining each of the contributions to this book is an
understanding of the timing of events in the insect life cycle.
Most daily activities (emergence, feeding, mating, egg laying,
etc.) undertaken by insects occur at precise times each day.
Likewise, seasonal events such as the entry into or termination
from an overwintering dormancy (diapause) occur at distinct times
of the year. This book documents such events and provides an
up-to-date interpretation of the molecular and physiological events
undergirding these activities.
The study of circadian rhythms has undergone a flowering in
recent years with the molecular dissection of the components of the
circadian clock. Now that many of the clock genes have been
identified it is possible to track daily patterns of clock-related
mRNAs and proteins to link the entraining light cycles with
molecular oscillations within the cell. Insect experiments have led
the way in demonstrating that the concept of a "master clock" can
no longer be used to explain the temporal organization within an
animal. Insects have a multitude of cellular clocks that can
function independently and retain their function under organ
culture conditions, and they thus offer a premier system for
studying how the hierarchical organization of clocks results in the
overall temporal organization of the animal. Photoperiodism, and
its most obvious manifestation, diapause, does not yet have the
molecular underpinning that has been established for circadian
rhythms, but recent studies are beginning to identify genes that
appear to be involved in the regulation of diapause. Overall, the
book presents the rich diversity of challenges and opportunities
provided by insects for the study of timing mechanisms.
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