| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Trade-off between different selection pressure is a hypothesis to explain individual variation in animal body color. This study examined the possibility that, while trade-off pattern changes periodically, shorter generation time of the animal would help the evolution and the maintenance of body color variation. We examined the ecology of four species of orb-web spider genus Cyclosa which have monomorphic species and species with small and large body color variation. Results showed that the negative relationship between generation time and the magnitude of body color variation. We also examined the relationship between body color and foraging efficiency or web site selection, the lifetime mating number, and built a population dynamics model that incorporated these results and assumed that the body color was heritable trait. The results of simulation supported our hypothesis, i.e., shorter generation time increased the extent of body color variation.
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