| Summary: | 碩士 === 國立臺灣師範大學 === 生物研究所 === 90 === An exotic butterfly in Keelung, Faunis eumeus, was studied for its distribution and population dynamics. The study was progressed between July, 2000 and April, 2002. Twelve study areas were set up and two of them, HM and HY, were selected for counting population size of adults and tracing survival rate of eggs or larvae.
In the study, the distribution of F. eumeus was stable but the population size in HM and HY was not stable, namely, the population size in HM decline straightly and in HY the population size first increased but later decline as soon as HM in 2001. However, the population size in HM and HY increase in the 2002’s spring. The dispersal of F. eumeus was not obvious but did happen in the marginal areas, such as SD and PK. The reason that made the population size decline obviously was one species of small wasps that lay eggs in the eggs of F. eumeus and causing hosts death. The insufficient source of food plants was also one reason that causing larvae death but not the main cause that decreased the population size. One new host plant was recorded, Calculigo capitulat. However, the female laid eggs whether on C. capitulata or not seemed to depend on population size of F. eumeus. The female preferred the initial host plant, Heterosmilax japonica and the larvae ate it had higher survival rate and higher emerging rate than those ate C. capitulata.
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