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Life table studies on the paddy field population of the green rice leafhopper, Nephotettix cincticeps Uhler (Hemiptera: Cicadellidae), with special reference to the mechanism of population regulation

Life table studies on the paddy field population of the green rice leafhopper, Nephotettix cincticeps Uhler (Hemiptera: Cicadellidae), with special re

Life table studies on the paddy field population of the green rice leafhopper, Nephotettix cincticeps Uhler (Hemiptera: Cicadellidae), with special reference to the mechanism of population regulation   (Citations: 5)
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Summary  The population growth of the green rice leafhopper,Nephotettix cincticeps, in the paddy field was analyzed based on the life table data accumulated for six years. The paddy field population, which stems from the invading adults of the first generation (G-I), repeats two complete generations, and the hatchlings of the fourth generation (G-IV) enter diapause and overwinter as the fourth instar nymphs in fallow paddy fields. It was clarified that the density dependent reduction in the mean longevity and oviposition rate of adult females in G-II and III played a primary role in stabilizing the annual population densities. The annual average of the mean longevity of G-II females (3.9 days) was much shorter than that of G-III ones (7.7 days) and thus the density dependent reduction in the mean longevity induced a more prompt regulatory effect on the oviposition of G-II females compared with G-III ones. As the result, two equilibrium densities of eggs were obtained,e.g., ca 100 and 700 eggs per hill in G-III and IV, respectively. Density dependent decrease in the proportion of mature females in the adult population was especially conspicuous in G-II, and this was closely associated with the density dependent reduction in the mean longevity and fecundity. Thus, the density dependent dispersal (emigration) of the adult females by flight in G-II and III was the most convincing factor in the process of population regulation. The density dependent dispersal of the adult females is effective in avoiding the deleterious effects of nymphal crowding in a breeding habitat unit (a paddy field), and may result in a more even distribution of the population over a continuous habitat units in a locality than otherwise.
Journal: Population Ecology - POPUL ECOL , vol. 19, no. 1, pp. 107-124, 1977
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    • ...The population density is regulated by processes that operate at the adult stage, i.e., dispersal and reduction in fecundity (Kiritani et al. 1970; Kuno and Hokyo 1970, 1976; Hokyo and Kuno 1977)...
    • ...Kuno (1968), Kuno and Hokyo (1970), and Hokyo and Kuno (1977) showed that, in Chikugo, predators or parasitoids could hardly cause density-dependent stabilization of N. cincticeps population...
    • ...Field censuses of N. cincticeps populations have been carried out intensively in the Southern District (Kiritani et al. 1970; Kuno and Hokyo 1970; Hokyo and Kuno 1977)...

    Kohji Hiranoet al. The outbreak mechanisms of the green rice leafhopper, Nephotettix cinc...

    • ...These values were also higher than those estimated for female adults in the later generations on rice (Hokyo and Kuno, 1977)...

    I Nyoman Widiartaet al. Life tables and population parameters of the green leafhopper, Nephote...

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