diapause

di·a·pause

D0198500 (dī′ə-pôz′)n. Zoology A period during which growth or development is suspended and physiological activity is diminished, as in certain insects in response to adverse environmental conditions.

[Greek diapausis, pause, from diapauein, to pause : dia-, between; see dia- + pauein, to stop.]

diapause

(ˈdaɪəˌpɔːz) n (Zoology) a period of suspended development and growth accompanied by decreased metabolism in insects and some other animals. It is correlated with seasonal changes[C19: from Greek diapausis pause, from diapauein to pause, bring to an end, from dia- + pauein to stop]

di•a•pause

(ˈdaɪ əˌpɔz)

n., v. -paused, -paus•ing. n. 1. a period of hormonally controlled quiescence characterized by cessation of growth and reduction of metabolic activity. v.i. 2. to undergo diapause. [1890–95; < Greek diápausis; see dia-, pause]

diapause

a period of rest or quiescence between phases of growth or reproduction.See also: Biology

Diapause

diapause

[′dī·ə‚pȯz] (physiology) A period of spontaneously suspended growth or development in certain insects, mites, crustaceans, and snails.

Diapause

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.

V. A. SVESHNIKOV

diapause

di·a·pause

(dī'ă-pawz), A period of biologic quiescence or dormancy with decreased metabolism; an interval in which development is arrested or greatly slowed. [dia- + G. pausis, pause]

diapause

(dī′ə-pôz′)n. Zoology A period during which growth or development is suspended and physiological activity is diminished, as in certain insects in response to adverse environmental conditions.

di·a·pause

(dī'ă-pawz) A period of biologic quiescence or dormancy with decreased metabolism; an interval in which development is arrested or greatly slowed. [dia- + G. pausis, pause]

diapause

a period of arrested growth and development in insects which is under the control of the endocrine system. Diapause is an adaptation to avoid adverse conditions, but does not automatically end with the termination of the adverse conditions as it is genetically determined. However, diapause can be ‘broken’ by an appropriate environmental change, or artificially by temperature shocks or chemical stimulation.

单词	diapause
释义	diapause di·a·pause D0198500 (dī′ə-pôz′)n. Zoology A period during which growth or development is suspended and physiological activity is diminished, as in certain insects in response to adverse environmental conditions. [Greek diapausis, pause, from diapauein, to pause : dia-, between; see dia- + pauein, to stop.] diapause (ˈdaɪəˌpɔːz) n (Zoology) a period of suspended development and growth accompanied by decreased metabolism in insects and some other animals. It is correlated with seasonal changes[C19: from Greek diapausis pause, from diapauein to pause, bring to an end, from dia- + pauein to stop] di•a•pause (ˈdaɪ əˌpɔz) n., v. -paused, -paus•ing. n. 1. a period of hormonally controlled quiescence characterized by cessation of growth and reduction of metabolic activity. v.i. 2. to undergo diapause. [1890–95; < Greek diápausis; see dia-, pause] diapause a period of rest or quiescence between phases of growth or reproduction.See also: Biology Diapause diapause [′dī·ə‚pȯz] (physiology) A period of spontaneously suspended growth or development in certain insects, mites, crustaceans, and snails. Diapause 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. V. A. SVESHNIKOV diapause di·a·pause (dī'ă-pawz), A period of biologic quiescence or dormancy with decreased metabolism; an interval in which development is arrested or greatly slowed. [dia- + G. pausis, pause] diapause (dī′ə-pôz′)n. Zoology A period during which growth or development is suspended and physiological activity is diminished, as in certain insects in response to adverse environmental conditions. di·a·pause (dī'ă-pawz) A period of biologic quiescence or dormancy with decreased metabolism; an interval in which development is arrested or greatly slowed. [dia- + G. pausis, pause] diapause a period of arrested growth and development in insects which is under the control of the endocrine system. Diapause is an adaptation to avoid adverse conditions, but does not automatically end with the termination of the adverse conditions as it is genetically determined. However, diapause can be ‘broken’ by an appropriate environmental change, or artificially by temperature shocks or chemical stimulation.
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