| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
To clarify dopamine regulation systems in the brains in eusocial bees, dopamine dynamics and factors affecting the levels in the honey bee and the bumble bee were determined. In the honey bee, dopamine has a role in promotion of reproduction in both workers and males. Factors affecting increase of brain dopamine were a presence of a queen (or queen substances) and tyrosine (a precursor of dopamine) supply in workers, and juvenile hormone and tyrosine supply in males. In the bumble bee, a positive correlation between ovarian development and brain dopamine levels was detected in queenless workers, but not in virgin queens with developed ovaries. Thus, the differences of dopamine regulation systems between sexes were found in the honey bee, and roles of dopamine differ between the castes in both species.
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