Mating Behavior of the Black Chafer, Holotrichia loochooana loochooana (Coleoptera : Scarabaeidae)

概要

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Mating behavior of the black chafer, Holotrichia loochooana loochooana (Sawada)(Coleoptera : Scarabaeidae), was observed in Miyako Island, southwestern Japan. Females settled on colonies of the beach naupaka, Scaevola sericea Vahal after evening flight. They showed clumped distribution within the colonies. Soon after they settled on the leaves, they commenced feeding on the leaf margin and extruded the abdominal gland (calling behavior). Attracted males landed on or near the calling females, and immediately mounted them. All the females accepted the males upon contact. After the genitalia was successfully jointed, the male raised his legs and suspended by his genitalia. Mean duration of copulation was 60.0±12.1 min (mean±SD, N=27). Of 17 calling females collected in the field, six females laid fertilized eggs. This indicates that females are polyandrous. In the laboratory, females and males stayed in a vermiculite layer in boxes during the day and came to the surface in the evening. Mating activity was observed only in the evening. Females and males continued to feed in the night, and went into the vermiculite layer at dawn.
日本昆虫学会の論文
2001-06-25