クロイトトンボの繁殖個体群 : II.繁殖場所での交尾可能雌の空間分布

概要

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Both sexes of Cercion calamourum meet at, or near, a pond used for oviposition. Within a pond area, sexual encounters occur more frequently at the better oviposition sites, suggesting that more females arrive at the better oviposition sites. However, since females come from outside the study area, they are often seized while en route at the surrounding bushes by males searching there. The probability of such interception increases with the number of males searching at the surrounding bushes. C. calamourum males maintain the tandem position with their mates throughout an oviposition bout to prevent takeover of mates by other males. Consequently, once seized by a male, a female is not available to any other males. The evidence suggests that, at sites far from the shore, even if there are good oviposition sites, the number of females arriving decrease with an increase in distance from the shore because, to reach there, females pass through a wider male search zone and are thus more likely to be intercepted. Thus, site suitability for oviposition and the distance from the shore are important factors affecting the spatial distribution of receptive females within the reproductive area.
日本生態学会の論文
1985-09-30