OBSERVATIONS ON THE BROOD DEVELOPMENT IN BOMBUS IGNITUS (HYMENOPTERA, APIDAE) : II. BROOD DEVELOPMENT AND FEEDING HABITS
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概要
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The present paper deals with the brood development and feeding habits in two colonies of Bombus (Bombus) ignitus Smith transferred and kept in the nest boxes in Otawara City, Tochigi Pref., Japan. The results observed are summarized as follows : 1. The length of each developmental stage is as follows (in days) : colony A : egg 5-6, larva 11-14, pupa (including prepupa) 10-12 ; colony B : egg 5-6, larva 11-19 (mostly 11-16), pupa 10-15 (mostly 10-12), total 28-36 (mostly 28-31). 2. The larval cells are 5.5 to 7 mm in diameter soon after hatching out and within four to five days after hatching out the position of each larva in the cell is detected from outside of the cell as a swelling. On eight to nine days after hatching out larvae spin thin silken partitions between themselves. The change of the size of cells is given in Table 2 and Fig.3. 3. The daily change of individual cells was precisely traced in some selected cases. The peripheral cells frequently change their original position mainly by the action of gravity as waxen wall of the cells becomes thinner. 4. The duration of cocoon spinning in a group of larvae from the same batch is rather long, mostly about four days but six to seven days in some brood. The cocoons produced of the same batch lose a stable connection and tend to become separated from one another. 5. The emergence from the same batch is relatively synchronous, taking three days for all individuals. Emerging adult bees gnaw the wall of the cocoon from the inside and house bees often help them to make the way out of the cocoon. 6. Food delivery from nurse bees to larvae is performed soon after pollen intake of nurse bees. Usually, nurse bees regurgitate food to larvae four to five times in succession after pollen intake, then they take honey once or twice to continue further food regurgitation. 7. When they feed the larvae with a honey-pollen mixture, workers open a small hole in the waxen wall of cells and tightly put their mouth parts in the hole. Soon they contract their abdomen once, then remove their mouth parts from the hole and finally close the hole in the waxen wall. 8. On regurgitation of the honey-pollen mixture, worker bees never extend their proboscis. A drop of the regurgitated liquid is usually deposited on the ventral surface of the coiled larval body. It is never given to larvae from mouth to mouth.
- 日本昆虫学会の論文
- 1973-06-25