Ecological significance of the wing polymorphism of the oriental chinch bug,Cavelerius saccharivorusOkajima (Heteroptera: Lygaeidae) |
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Authors: | Kenji Fujisaki |
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Institution: | (1) Laboratory of Sugarcane Insect Pests, Okinawa Prefectural Agricultural Experiment Station, 903 Naha, Japan |
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Abstract: | Summary The wing polymorphism of the oriental chinch bug,Cavelerius saccharivorus, was studied in relation to its reproductive strategy. The frequency distribution of wing form in terms of the relative wing
length (R.W.L.) changed with increase in the population density from a single modality biased toward the brachypterous form
to bimodality with both macropterous and more extreme brachypterous forms. Since some evidences in the field showed that fliers
are limited to macropters, such a bimodality of wing form indicated thatC. saccharivorus employs a mixed strategy with some portion of adults staying on in the same habitat, whereas the rest disperse. Moreover,
macropters were larger in body size than brachypters emerging in high density populations, although smaller than brachypters
emerging in low density populations. Larger body size as well as the delay of ovarian maturation in macropters was considered
to be a beneficial trait for migratory behaviour. |
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Keywords: | |
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