Factors Controlling the Diurnal Rhythm of Activity of Periplaneta Americana L
نویسنده
چکیده
INTRODUCTION Two main lines of approach are evident in recent work on diurnal rhythms of activity in animals. On the one hand investigators have been determining the form of the activity rhythm of many animals, particularly insects, and the effects of various environmental factors on these rhythms. On the other a small amount of work has been carried out on the internal factors which are involved in the mechanisms of the rhythm. From the results of the former line of investigation it appears that light or darkness is the factor which fixes the rhythm in most cases, while temperature may modify but not impress a rhythm. The most significant feature of these results is that in most animals it has appeared that once an activity rhythm is established by means of alternating light and darkness then that rhythm continues for a period of time under new environmental conditions. This implies the presence of an 'internal clock' which is regulated by the external conditions but can function without regulation for a period varying in different animals from a few days, as in cockroaches, to months or longer, as in some beetles (Park, 1932) and mayflies (Harker, 1953). A possible ' internal clock' in Periplaneta americana L. is described in the following pages, and the way in which it may be regulated by the environment is discussed.
منابع مشابه
The Effect of Perturbations in the Environ- Mental Cycle of the Diurnal Rhythm of Activity of Periplaneta Americana L
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تاریخ انتشار 2005