Avian Assemblages of Different Seral Stages in Tataka Area

• Main Authors: Huan-Chang Liao, 廖煥彰
• Other Authors: Tzung-Su Ding
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/14803895021377898966

碩士 === 國立臺灣大學 === 森林環境暨資源學研究所 === 94 === I investigated avian assemblages in five seral stages of vegetation succession which were conducted in Tataka area of the central Taiwan during March to July, 2004. The study included (1) the effects of vegetation succession on bird community structures and (2) the differences of food resources utilization among birds in different stages of succession. Twenty- two sampling plots were selected to represent the five different seral stages: Yushan Cane (Yushania niitakayamensis) steppe (YCS), Taiwan Red Pine (Pinus taiwanesis) savanna (TRPS), Taiwan Red Pine woodland (TRPW), Taiwan Hemlock (Tsuga chinensis) forest (THF) and Taiwan Spruce (Picea morrisonicola) forest (TSF). I examined breeding bird density by point count method and discriminated different guilds from foraging behaviors. Besides, twenty habitat factors were measured in a 20 × 20 m grid cell of each station in the study site. 49 species were recorded during the study period. All species were grouped into 10 guilds based on its diets, foraging tactics and foraging locations. The results showed that bird species compositions, guild structures and habitat factors revealed significant differences in different seral stages. Moreover, avian community parameters such as population density, richness, species diversity and biomass increased with the succession gradient and reached the highest value at TSF. In avian community similarity analysis, the Bray-Curtis index decreased with the increasing intervals of succession seral stages. Most of the physiognomic and floristic factors showed strong correlations with the variation of avian assemblages in vegetation succession. Ground and shrub-foraging species favored non-forest vegetation in the early succession stages. However, tree-foraging bird species showed the higher population density in the middle-late succession stages. According to the composition of guilds in seral stages, the differences in vegetation structures and distribution of foliage volumes among stratums might influence the utilization of food resources in birds.