| Budget Amount *help |
¥43,030,000 (Direct Cost: ¥33,100,000、Indirect Cost: ¥9,930,000)
Fiscal Year 2018: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2017: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2016: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
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| Outline of Final Research Achievements |
Competitive inferior species can be frequently found with competitively superior species. However, it is not necessarily clear why such a coexistence is possible. In this study, ecological mechanisms enabling the coexistence of competitive species were examined using genotypes in obligate parthenogenetic Daphnia pulex that were invaded from north America. Genetic analyses, common garden experiments and field observations showed that a number of heritable traits have been evolved in this species after the invasion into Japan. Among these, frequency of the resting egg production was one of the heritable traits that could be easily changed and was high in competitively inferior genotypes. In addition, it was revealed that competitively inferior genotypes could avoid competition with competitively superior genotypes by producing frequently the resting eggs. These results support an importance of storage hypothesis as a mechanism for the sympatric coexistence of competitive species.
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