セコプマメゾウムシ属二種の配偶行動の比較

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Observations on the mating behaviour of two species of the bean weevils, Callosobruchus chinensis and C. rhodesianus (?) were done under the conditions of 30℃, 75% R.H. and daily photophases of 16 hrs. When a female and a male of C. chinensis were introduced into the experimental arena, the male first moved around rather sluggishly, but suddenly he begun to move quickly with rapid movement of his antennae. Such change of behaviour, called 'activation' here, could not be seen when a male alone was introduced into the arena. Once the male found the female, he continued to follow her very closely, and struck her with his antennae. During copulation, the female remained stationary and exhibited no excitement. The male of C. rhodesianus walked around more actively than C. chinensis, and no change of his behaviour was observed in the course of finding the female. Before copulation, the male stood near the female and rapidly struck her with his antennae. During this duration, the female remained quiet. Sometimes mutual sparring with the antennae between both sexes was observed in the first step of mating behaviour. The male did not show the behaviour of running after the female. Homosexual behaviour, e.g. pursuing a male by another male, did occur frequently in C. chinensis but not in C. rhodesianus. In both species, a male found a female more easily when the female had been introduced in the dish 10 minutes prior to his entrance, than when she had been introduced at the same time. They could mate in darkness as well. When the male's antennae were amputated, he could not find a female. The female mated previously lost her attractiveness to the male. Reaction of the male to the female is specific for each species. In C. chinensis, the time required from the introduction of the male to his 'activation' as well as to his success of mating with the female was shortened as the size of the arena was reduced. While, in C. rhodesianus, the shortening of the time to mate was not so great as in the former. Even in a small tube, the males whose antennae were amputated could not mate in C. chinensis but some of them could mate in C. rhodesianus. These and other observations suggest that some stimulus (or stimuli) perceived by the male through his antennae, which may probably be olfactory in nature, is important in C. chinensis for the male's attraction to the female. In C. rhodesianus, the discovery of and copulation with the female by the male seems to depend to a greater extent upon the encounter by chance between the male and the female. Pre-mating period was very short in both species. The effect of delayed mating on the number of eggs laid per female was less marked in C. chinensis than in C. rhodesianus. When a female mated only once, the percentage of unhatched eggs was higher in C. rhodesianus than in C. chinensis.
日本生態学会の論文
1969-02-01

セコプマメゾウムシ属二種の配偶行動の比較

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