CO2-Narcosis Time Favorable for Colony Development in the Bumblebee Queen, Bombus terrestris
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Abstract
As a means for year-round rearing of bumblebee,CO2-narcosis time favorable for colony development was identified in Bombus terrestris. CO2-narcosis time divided into five classes: 11 days of adult emergence (A-11), the day of adult emergence (A-0), late pupal stage (LP), middle pupal sta ge (MP), and early pupal stage (EP). In egg-laying characteristics, the oviposition rate of LP, A-11 and A-0 was over 76.0%, but that of MP and EP was less than 61.1%. At the same time, the days needed to first oviposition shortened to 9.8 -10.5 days in A-11, A-0 and LP, comparing to 13.7 - 16.1 days in MP and EP. The rate of colony foundation,progeny-queen produced and period of colony foundation of A-11 were the best results in among those at different CO2-treatment time. The number of worker produced was 109.2 - 110.5 in A-11, LP and A-11, comparing to 82.0 - 86.8 in MP and EP. Also, the number of progeny-queen produced of A-11, A-0 and LP was 36.1, 41.0 and 71.3, respectively, which corresponded to 1.5 - 3.1 fold higher than MP and EP. Taken these together, CO2-narcosis time favorable for colony development was determined to be 11 days of adult emergence. Also, the day of adult emergence and late pupal stage showed a positive effect on the ovipostion and colony development in CO2-narcosis time.
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