• Korean journal of applied entomology
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• v.42 no.4
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• pp.367-381
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• 2003

Dispersal polymorphism in insects Is a kind of adaptive strategy of the life history together with the diapause, consisting of the “long-winged or alate forms” of migratory phase and the “short-winged or apterous forms” of stationary phase. Dispersal polymorphism is a polymorphism related with the flight capability, and has three categories ; the wing polymorphisms, flight muscle polymorphisms, and flight behavior variations. Phase variation is another type of dispersal polymorphism varying in morphology, physiology and wing forms in response to the density of the population. The dispersal migration is a very adaptive trait that enables a species to keep pace with the changing mosaic of its habitat, but requires some costs. In general, wing reduction has a positive effect on the reproductive potential such as earlier reproduction and larger fecundity The dispersal polymorphism is a kind of optimization in the evolutionary strategies of the life history in insects; a trade-off between the advantages and disadvantages of migration. Wing polymorphism is a phenotypically plastic trait. Wing form changes with the environmental conditions even though the species is the same. Various environmental factors have an effect on the dispersal polymorphisms. Density dependent dispersal polymorphism plays an important role In population dynamics, but it is not a simple function of the density; the individuals of a population may be different in response to the density resulting different outcomes in the population biology, and the detailed information on the genotypic variation of the individuals in the population is the fundamental importance in the prediction of the population performances in a given environment. In conclusion, the studies on the dispersal polymorphisms are a complicated field in relation with both physiology and ecology, and studies on the ecological and quantitative genetics have indeed contributed to understanding of its important nature. But the final factors of evolution; the mechanisms of natural selections, might be revealed through the studies on the population biology.

• 건강소식
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• v.12 no.2 s.111
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• pp.14-27
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• 1988

흔히, 건강과 스트레스, 사회가 건강에 미치는 영향, 식생활의 변화와 건강 등에 관한 얘기를 할 때 그 촛점은 40대에서 50대의 성인에 맞추어 지게 된다. 그렇다면 그 이전엔 과연 이러한 영향을 받지 않을까? 확실히 그렇지 않다. 신체적으로나 생각들이 한창 자라는 나이인 어린이들. 당장 눈에 보이는 것은 아니라 하더라도 이들은 누구보다도 그런 변화에 민감하게 반응한다. 따라서 어린이를 정말로 건강하게 키우려면, 이제는 잘 짜여진 식단이나 따뜻한 방안에서 키울것이 아니라 한차원 높여, 올바른 성격을 형성하고 올바르게 사회를 인식할 수 있는 능력을 키울 수 있는 분위기를 만들어주어야 하겠다.