Seasonal changes in ovarian state in a eusocial halictine bee,Lasioglossum duplex,based on stages of the oldest oocytes in each ovariole (Hymenoptera: Halictidae) |
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Authors: | Katsuo Gôukon Yasuo Maeta Shôichi F. Sakagami |
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Affiliation: | (1) Biological Laboratory, Tohoku Gakuin University, 980 Sendai, Japan;(2) Laboratory of Insect Management, Faculty of Agriculture, Shimane University, 690 Matsue, Japan;(3) Zoological Section, Institute of Low Temperature Science, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | Summary The changes in ovarian activity in the life cycle of the eusocial halictine beeLasioglossum (Evylaeus) duplex (Dalla Torre) was studied in both queens and workers by examining the stages of the terminal follicle in each of the six ovarioles. By this method, ovarian activities of both queens and workers were more quantitatively determined than by observation of gross ovarian features as usually conducted. Queen ovaries clearly exhibited two active periods, corresponding to the spring solitary phase and the summer eusocial phase, with distinctly greater activity in the latter. In ovaries of overwintering queens oosorption of young follicle was observed. Worker ovaries were found more active in orphan than in queenright colonies. The order of ovarian activity obtained from pooled data, summer queens>spring queens>orphan workers>queenright workers, was also recognized by comparison of individual females. Bionomics of the eusocial halictine beeLasioglossum duplex IX. Contribution No. 3107 from the Inst. Low Temp. Sci. |
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Keywords: | Nurse Cell Ovarian Activity Corpus Luteum Queenright Coloni Foundress Queen |
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