Influence of Parental Age upon the Offspring in the Green Rice Leafhopper, Nephotettix cincticeps UHLER (Hemiptera : Deltocephalidae)

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In order to make clear the possible role of the age-related effects of parents on the ecology of the green rice leafhopper, females were allowed to deposit eggs under a constant experimental condition (25℃, 70%RH, 16 hr day-length) and the ensuing larvae from the eggs laid by the mothers of different ages were reared individually with the young seedling of rice plant as their food. Differences in the physiological characteristics were compared with each other among the progeny produced from parents of different ages. The daily oviposition rate and the hatchability and size of eggs laid, on 1st to 2nd, 6th to 7th, 11th to 12th, 13th to 14th and later than 15th days elapsed after the beginning of oviposition, increased at first, attaining their maxima on 6-7th or 11-12th days and then decreased with increasing maternal age, forming parabolic trends. Daily changes in the number of eggs laid by each female, however, showed a cyclic fluctuation at intervals of 3-4 days over her oviposition period. In each cycle, most of the eggs were laid on the first day, and the later the day in the cycle the fewer were the eggs deposited. The same cyclic trends were also detected in the daily hatchability and size of eggs laid over the whole oviposition period. It was considered, therefore, that female physiological activity gradually decreases after passing the postemergence maturatoin period so that the trend will become parabolic and that the nuequal partitioning of maternal food reserves will cause a change for the worse in the viability of the progeny produced during the last half of individual ovipositional cycles. The incubation period of eggs and most characteristics in the larval period, the size of the hatchling, survival time of unfed hatchling, length of period from oviposition to adult emergence, survival at larval stage etc monotonously changed with the aging of mothers. This gap, between the parabolic trends observed at the egg stage and the monotonous changes at the later stage, may be accounted for by the possibility of many deaths of weak progeny that result from selective elimination which could be associated with the unequal partitioning of the egg substrate, and also from the posponed manifestation of age related qualitative difference of the progeny itself. The difference of parental age gave rise to the qualitative variability of the adult progeny. Young mothers brought forth their progeny with protracted preoviposition period, low fecundity and long life-span. On the other hand remarkably persevering adults which withstood starvation longer came into being from old mothers. It is suggested that both adult progenies will assume different functions in the life of this species.
日本応用動物昆虫学会の論文
1970-12-25

Influence of Parental Age upon the Offspring in the Green Rice Leafhopper, Nephotettix cincticeps UHLER (Hemiptera : Deltocephalidae)

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