Evolution of density-dependent wing determination that is regulated by juvenile hormone level.
We studied the evolution of juvenile hormone (JH) regulation in wing-polymorphic insects. We considered an asexual species that undergo larval and adult stages living in many patches. The rate of larval growth depends on within-patch resources which can be depleted by larvae. Dispersal-type adults migrate out of the natal patch just before reproductive stage; reproductive-type adults have a greater fertility than those of dispersal-type adults but no dispersal ability. The wing type was determined by the juvenile hormone (JH) level in a critical period if the larval stage. The carrying capacity of resources fluctuates between high and low values. The JH level follows a normal distribution. Evolution modifies the mean and the variance of JH level. The mean of JH level is determined by the basal JH level and density dependent degradation. The variance of JH level is constant.
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