Oviposition Behavior and Its Impact on Interspecific Competition in Callosobruchus chinensis (L.) and C. maculatus (F.)
Date Issued
2004
Date
2004
Author(s)
Lin, Jiunn-Yaw
DOI
zh-TW
Abstract
Oviposition Behavior and Its Impact on Interspecific Competition in Callosobruchus chinensis (L.) and C. maculatus (F.)
Jiunn-Yaw Lin
ABSTRACT
The bean weevils of Callosobruchus chinensis and C. maculatus frequently infested seeds in the same stored house simultaneously. The interspecific competition between the two bean weevils in various competitive situations was studied. Firstly, the effects of host resources of azuki bean and mung bean upon their fecundity and longevity were examined. The results showed that the intrinsic rates of increase of C. chinensis on azuki bean and mung bean were greater than that of C. maculatus. After depriving hosts for 2, 4 or 8 days, females would reduce their fecundity and channel the energy to sustain their lives. However, the effect of deprivation on fecundity decrease of C. chinensis was more significantly than that of C. maculatus. Secondly, Competitions between the two bean weevils under various initial densities with the same ratio or various ratios under the same density of the two competitive species were examined. Thus, I may clarify the effect of inter- and intra-specific competition between the two beetles based on the fecundity and the offspring predicted by competitive model I proposed. Based on the fecundity and the predicted offspring in various initial densities, competitions at different stages of the life history of the two species were also evaluated to show the impact of oviposition competition in the two species. It is shown that the fecundities of C. maculatus are higher than that of C. chinensis in most of the various situations. The impact of intraspecific competition on oviposition is greater for C. maculatus than for C. chinensis. Thus, interspecific competition influences C. chinensis more significantly. The predicted number of offspring of C. maculatus calculated by the competitive models are also more than that of C. chinensis. The offspring left by C. maculatus from competition experiment are also more than that of C. chinensis and showed a concordance with the predictions of the competitive models. The sex ratio of offspring of C. chinensis was biased to male, whereas it is approximately 1:1 for C. maculatus. There for evidence supports the superiority of C. maculatus over the C. chinensis in the competition. Finally, the effects of conspecific and interspecific interference of male and virgin female on the fecundity and longevity of two bean weevils were studied. It was found that the fecundity and larvae hatched of these two species decreased with increasing conspecific or interspecific male and virgin female density. Impacts of intraspecific and interspecific interference of male and virgin female on fecundity or egg hatchability of the two bean weevils are significantly different. Therefore, these effects can be crucial factors to the competition of the two bean weevils.
Subjects
種間競爭
四紋豆象
產卵行為
綠豆象
oviposition behavior
Callosobruchus chinensis
interspecific competition
C. maculatus
Type
thesis
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