Estimating the survival rate and mean longevity for adults in a field population of the green rice leafhopper,Nephotettix cincticepsUhler, by the application ofHokyo andKiritani’s method
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Application of the female dissection method proposed byHokyo andKiritani (1967) was attempted in both 1968 and 1969 to estimate the daily survival rate and the mean longevity for the adult population of the green rice leafhopper,Nephotettix cincticeps, in a paddy field. The estimated mean longevity for females was far shorter than the physiological longevity of this species, ranging from 4 to 7 days with some variation between different generations. This could explain the remarkable discontinuity among successive generations which proved to form an important feature of the pattern of seasonal population changes of this insect. Between the two years, the estimated survival rate (and hence the mean longevity also) was negatively correlated to the estimated population size of adults that emerged in either of the two successive generations. This apparent density dependence suggests the possibility that the adult survival, including the effect of dispersal, plays some critical role in bringing about the remarkable population stability from year to year shown by the field population ofN. cincticeps.
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- Hokyo, N. andK. Kiritani (1967) A method for estimating natural survival rate and mean fecundity of an adult insect population by dissecting the female reproductive organs.Res. Popul. Ecol. 9: 130–142.Google Scholar
- Kuno, E. (1968) Studies on the population dynamics of rice leafhoppers in a paddy field.Bull. Kyushu Agric. Expt. Sta. 14: 131–246 (in Japanese with English summary).Google Scholar
- Nasu, S. (1963) Studies on some leafhoppers and planthoppers which transmit virus diseases of rice plant in Japan.Bull. Kyushu Agric. Expt. Sta. 8: 153–349 (in Japanese with English summary).Google Scholar