碩士 / 國立屏東科技大學 / 熱帶農業暨國際合作研究所 / 91 / Nest predation is one of the major factors that resulted in reproductive failure among bird populations. It will be highly expected that there is a close correlation between the reproduction rate of birds and the abundance of nest predators. The composition and the foraging behaviors of nest predators would reflect on the patterns in nest predation. It would be useful in understanding bird reproduction to study the factors affecting the population dynamics of nest predators. Shell remain in artificial nest and the automatic camera system were used in this study to evaluate the nest predation risks of ground reproduced birds at different altitudes and in different habitats.
This study found that the highest predation rate occur at medium altitude range (about 2000m), the 2nd highest predation rate occur at low altitude range (about 1000m), while the lowest predation rate occur at highest altitude (about 3000m). The predation rates were higher in both medium and low altitude ranges that were forested, than in grasslands in the same range. However, there was indifferent in the predation rate between forest and grassland in the high altitude range.
The species composition of nest predators varied with altitudes and habitats. This study found that most of the nest predators were mammals, some of them were birds and snakes. The species of predators in forest had were higher diversity at medium and high altitude, and the lowest in the low altitude range.
To sum up, altitudes and habitats were the two major factors affecting the nest predation rates of ground reproduced birds. Various environmental conditions in different habitats may be the reasons for different nest predation risks.
| Identifer | oai:union.ndltd.org:TW/091NPUST643054 |
| Date | January 2003 |
| Creators | Jeng-Wen Wu, 吳正文 |
| Contributors | Ching-Long Yeh, Yuan-Hsun Sun, 葉慶龍, 孫元勳 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
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