Ceratina japonica Cockerell の訪花性 : 日本産花蜂の生態学的研究 XXIV  [in Japanese] Flower-visiting habit of Ceratina japonica Cockerell : Biological studies on Japanese bees XXIV  [in Japanese]

1. Ceratina japonica Cockerellの訪花性を1952-1959年に篠山盆地にて研究した.2. C. japonicaは4-10月までの間に訪花活動を行なう.越冬から脱し交尾を終えた♀は, 卵巣発達準備期の訪花(request type C)を約1カ月間行なつた後, 造巣に入る.9月に羽化した個体は, 全く未発達の卵巣のまま, 吸蜜のための訪花活動を行なつた後, 越冬に入る.3. C. japonica♀では, 20科43属52種の訪花植物を記録した.優勢に訪花したのは, ノギク, タンポポ, ノアザミ, ゲンノショウコ, レンゲ, シロツメクサ, アブラナ, キンポウゲなどであり, キク科植物を最も多く訪花の対象とした.概してこの種の訪花習性はpolylecticである.

Flower-visiting habit of Ceratina japonica Cockerell was examined during from April to October of 1952-1959. The females appeared in April from winter-quarters, and they visited flowers for pollen eating and nectar sucking. About 30 days after appearance, they began nidificating, and changed into the complete form of request in flower-visiting. Autumn emerged males and females visited flowers for nectar sucking only, and after this, both sexes entered into winter-quarters. They seem to take nutrition only for the coming hibernation. The females visited flowers of 52 species belonging to 20 families. Out of them, Taraxacum plalycarpum, Cirsium japonicum, Geranium nepalense, Astragalus sinicus, Trifolium repens, Brassica campestris subsp., and Ranunculus acris were visited dominantly by this species. It seems that Ceratina japonica has polylectic habit in flower-visiting, however, it shows remarkable preference to the flowers of Compositae.