| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
We found that spider mites avoid footprint hydrocarbons left by generalist predator ants, and experimentally demonstrated that ants tending aphids consume spider mites living on the same plant. We demonstrated for the first time that predator-experienced spider mites protect offspring from predation by ovipositing on webs which are less accessible to predators. Moreover, proportions of eggs on webs can be used as a stealthiness index of predatory mites that is consistent across spider mite species and populations. We also found that predatory mite eggs delay hatching in response to mechanical stimuli simulating egg predation attempts until the predation risk is reduced, and that wild vine plants avoid coiling around neighbouring plants infested by spider mites which would prevent serious “contact infections” to the plants by mites.
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