Competition between laboratory populations of green leafhoppers,Nephotettix spp. (Homoptera: Cicadellidae) |
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Authors: | Reynaldo R Valle Eizi Kuno and Fusao Nakasuji |
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Institution: | (1) Entomological Laboratory, Faculty of Agriculture, Kyoto University, 606 Kyoto, Japan;(2) Laboratory of Applied Entomology, Faculty of Agriculture, Okayama University, 700 Okayama, Japan;(3) Present address: The National Crop Protection Center, University of the Philippines at Los Ba?os, College, 4031 Laguna, Philippines |
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Abstract: | Summary Intra- and interspecific competition between laboratory populations of four green leafhoppers,Nephotettix spp. was studied in the laboratory under three different temperature regimes of 24°C, 27°C and 30°C. For the single-species
population of the three tropical species, the equilibrium density increased as the temperature increased. On the other hand,
for the temperature speciesN. cincticeps, the highest equilibrium density was at the intermediate temperature and the lowest at high temperature.
Interspecific interactions between two tropical (N. virescens vs.N. nigropictus), a tropical and a temperature (N. virescens vs.N. cincticeps) and a rice-feeding and a grass-inhabiting (N. virescens vs.N. malayanus) Nephotettix species were also studied in the laboratory at the three temperature regimes. Temperature differentially affected the outcome
of competition between twoNephotettix species. BetweenN. virescens andN. nigropictus, the latter was more successful over the former at low and intermediate temperatures, while the former was more successful
at high temperature. BetweenN. virescens andN. cincticeps, the temperate species inhibited the growth of the tropical species at low temperature while the tropical species inhibited
the growth of the temperate species at high temperature. At intermediate temperature, the population ofN. virescens persisted at a slightly higher density over the population ofN. cincticeps. Between the rice-feedingN. virescens and the grass-inhabitingN. malayanus, regardless of temperature the population density of the latter was greatly reduced and later became extinct while the population
of the former continued its growth. These consequences of competition between twoNephotettix species conformed fairly well to those predicted by theLotka-Volterra model using demographic parameters specified for each species. |
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