| Summary: | 碩士 === 輔仁大學 === 生物學系 === 84 === Uca arcuata is one kind of fiddler crab, and it is widely
distributed in East Asia. The habitat of Uca arcuata is the mud
area in the tidal zone of the river mouth. A large population
can be found especially in the tidal creek side of the
mangroves. The study area of this paper was located at the
mangroves of the Zhu-Wei district of Taipei County. The field
observation was taken place between June 1995 and May 1996.
At the burrow entrance of Uca arcuata, a chimney can always be
found. The building condition of the chimney construction
depends on age, sex, the breeding state of the female, the
situation of the micro-habitat, and the crab as a wandering type
or not. The result of this study indicates that a chimney does
not mean to be a landmark, a guidepost or used for a courtship,
and that a new chimney will be rebuilt if someone removes the
old one. Therefore, It is assumed that the building of the
chimney construction might improve the micro-habitat and the
breeding environment. The territorial behavior includes four
kinds of activities: warning, driving & threatening, combat, and
defense. Fighting is always found between males of similar
sizes. Larger males often win in the fighting. The territory is
set around the center of the burrow. Generally, larger crabs
have larger home range, but the size of the territory is
interrelated with other factors such as the distance and the
intention of other approaching crabs.
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