| Summary: | 碩士 === 靜宜大學 === 生態學研究所 === 95 === The preliminary study of overwintering ecology of danaine butterfly in Da-wu Area, Taitung was conducted during Nov. 2004 to Mar. 2005 and Oct. 2005 to Mar. 2006. Overwintering butterflies were composed of Euploea sylvester swinhoei, Tirumala septentronis, E. tulliolus koxinga, E. eunic ehobsoni, E. mulciber barsine, and T. limniace limniace in both experimental periods. The overwintering communities in winter of 2004 and 2005 were 352369 and 1628554 respectively. E. sylvester swinhoei was the most abundant species during winter of 2004 (341663) while T. septentronis, E. eunic ehobsoni, E. tulliolus koxinga were 90752, 25921 and 15914 respectively. During winter of 2005, E. eunic ehobsoni was the most abundant species (949412) while E. sylvester swinhoei, E. tulliolus koxinga, T. septentronis, and E. mulciber barsine were 762191, 239835, 230176, and 32980 respectively. Among the overwintering danaine butterfly, T. septentronis had the longest forewings. E. eunic ehobsoni was the second, E. sylvester swinhoei was the third, and E. tulliolus koxinga was the shortest. The forewing length of female butterfly was longer than of male in the four danaid butterflies. E. eunic ehobsoni had the greast body mass, T. septentronis was the second, E. sylvester swinhoei were the third, and E. tulliolus koxinga were the least. Furthermore, the body mass of the four danaid butterflies decreased significantly during overwintering preriod. The body mass and dry mass had the same pattern. The dry mass of male E. eunic ehobsoni was weightier than of female. Both T. septentronis and E. sylvester swinhoei, the dry mass of female were weightier than of male. There was no significant dry mass difference between male and female E. tulliolus koxinga. Concerning the dry mass of fat body, E. eunic ehobsoni were the weightiest, T. septentronis and E. sylvester swinhoei took second place, and E. tulliolus koxinga were the lightest. The percentage of female butterfly possessing spermatophore of the four danaid butterflies species were high in the beginning of winter and increased month by month.
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