Relationships between Terrestrial Bird Song Characteristics and Habitat Types in Taiwan

• Main Authors: Chih-chieh Yang, 楊智傑
• Other Authors: Hau-Jie Shiu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/97940083053675451095

碩士 === 國立臺南大學 === 環境生態研究所碩士班 === 99 === Environmental structure is considered an important factor driving birds'' song evolution. As per voice characteristic of its decaying level in different environment, Acoustic Adaptation Hypothesis (AAH) predicts bird voice with lower frequency, narrower frequency range and longer syllable interval within dense vegetation in order to increase transmission effectiveness and reduce voice decay. According to birds'' major habitat and singing zone, I divided their habitats into 3 types: open, close and edge. I analyzed a total of 44 species of birds distributed in Taiwan including Cuculiformes, Piciformes, and Passeriformes. I examined their voice variations including highest frequency, lowest frequency, frequency range, main frequency, main frequency average value, main frequency standard deviation, and syllable deviated level in order to further inspect birds'' voice in different habitat for differences. Even though birds'' voice frequency in an open and edge-type habitat makes no significant differences to all voices'' variable values statistically. AAH is taken exclusive use for birds'' habitat; however Taiwan''s birds have not exclusively selected their habitat. In addition, there are various factors that affect birds'' voice. Environmental restriction is hard to fully explain birds'' voice evolution direction; therefore, results of this study can not support the hypothesis.