ヒメツツハキリバチの生態学的研究

概要

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Megachile subalbuta is mainly distributed in southern Japan and is partially bivoltine. The second generation emerged from those nests completed before late June. On alfalfa flowers, the speed of visitation was 12 flowers/minute and tripping rate was 100%, suggesting this species could be a promising pollinator of alfalfa. The maximum number of eggs laid per female reached up to 49, reflecting a high reproductive potential. Nest tubes, having diameter of 6.5-6.9 mm and length of approximately 15 cm, were most preferred. Various different types of leaf pieces were used for nest construction, i.e., large oval-shaped (A-1), small oval-shaped (A-2), and semiround-shaped (A-3) for the cell cup ; round (B-1) and semiround (B-2) for the cell cap. Semiround-shaped (C-1) was also used for closing the entrance. Moreover, the cell plugs, each was formed by 1-2 sheets of B-2, were pasted by partially masticated leaf fragments, and placed to close each provisioned cell. The last provisioned cell was protected by a double-layered cell plug. As natural enemies of M. subalbuta, Cylindrothecum, a phorid fly, Anthrax, Melittobia, Trogoderma, and Zonitis were found in trap-nests at several localities in southern Japan.
日本昆虫学会の論文
1999-09-25