| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Maturation patterns and sexuality of juveniles of polygamous damselfishes (Pomacentridae) were investigated by tank rearing experiments. Juvenile fishes were captured on reefs of Kuchierabu-jima Island (Dascyllus reticulatus), Yaku Island (Abudefduf vaigiensis) and Okinawa Island (Chrysiptera cyanea and C. glauca), subsequently were kept in tanks in both solitary and pair conditions for 9 months (2012 started exp.) or 12 months (2013 started exp.), and gonadal sex was histologically examined. In D.reticulatus, juveniles all initially matured as females regardless of rearing conditions, due to the protogynous sexuality in adults. In A. vaigiensis, juveniles matured as males or females in the even sex ratio, due to the gonochoristic sexuality in adults. In Chrysiptera species, which have long been believed as gonochores, however, we confirmed hermaphroditic gonads and female-biased maturation patterns in both species, suggesting possibility of protogynous sexuality.
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