(redirected from diapauses)
Also found in: Dictionary, Medical.


A period of spontaneously suspended growth or development in certain insects, mites, crustaceans, and snails.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a period of rest in the development of animals, characterized by a sharp decline in metabolism and a halt in formative processes. Sometimes the concept of diapause is extended to other organisms.

During diapause the organism is more resistant to unfavorable external conditions. For example, insects become resistant to insecticides. In the temperate and high latitudes the onset of diapause in many animals is determined by the length of daylight. The termination of diapause is connected with changes in the organism, which may be caused by the prolonged action of low winter temperatures. Thus, diapause ensures the animal’s ability to withstand below-freezing temperatures and hibernation. In arid subtropical and tropical climates, summer diapause, or estivation, occurs (for example, in the pink bollworm and the tomato fruitworm).

In each biological species diapause is timed to a certain phase in the life cycle. Embryonic diapause is the period of rest in the egg stage between fertilization and mitosis or toward the end of mitosis. This type of diapause occurs in rotifers, lower crustaceans, grasshoppers, Chinese silkworms, and in a number of mammals belonging to seven orders (for example, rodents and predators, including sable and mink). Larval diapause occurs, for example, in the black-veined white butterfly, which hibernates in trees during the caterpillar stage. Pupal diapause is observed among large white cabbage butterflies and cabbage moths, which hibernate in trees and in the soil during the pupal stage. Imaginal diapause occurs in such insects as mosquitoes and leaf beetles (Colorado beetles). In imaginal diapause the animal may retain its mobility, but the process of sexual maturation ceases.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
avenae depend upon specific temperature conditions breaking one type of diapause, obligatory and in summer for the two populations originating from Oued Smar in a sub-humid coastal plain and from Tiaret in an inland semi-arid plain [14].
Photoperiodic control of diapauses termination, color change and postdiapause reproduction in the southern green stink bug, Nezara viridula.
Keywords: Grapholita molesta; Diapause development; Low temperature; Carbohydrate metabolism; Antioxidant enzyme
Current research on Artemia nurpl has mainly focused on development before diapause (Qiu and MacRae, 2007), but little is known about post-diapause.
If the 15-19-week treatment is the optimal chilling period for pupae in nature, then this suggests that apple flies generally have deeper diapauses or slower metabolic rates than hawthorn flies, consistent with the diapause trade-off hypothesis.
Hibernation, diapauses and aestivation constitute three important adaptive responses adopted by many organisms to escape deteriorating environmental conditions.
Temperature is the most important factor which affects growth development and diapauses of Helicoverpa (Fye and Poole 1971; Attique et al.
However, the model does not account for environmental factors such as shorter day length, which could induce diapauses response and therefore reduce the generational ability of S.
granarium to enter in diapauses. In current research maximum number of eggs and minimum larval to pupil developmental period was observed at 30 and 35C which are in accordance to the results of Burges and Cammell (1964) who reported that maximum development occurred between 35 and 37.5C.