Playback Expedments on Bush Warbiers (Cettia diphone): Their Song Recognition of Intra- and Inter-Population

휘파람새의 Intra-and Inter-Population Songs 인식에 관한 Playback실험

Playback experiments were performed to clarify the degree of song recognition using inter - and intra-populatlon songs of Bush Warbler at Cheongwon, Chungbuk area. Six territorial males were strongly responded to inter- as well as intrapopulation songs. Their responses to the inter- and Intra-population songs were not differed significantly in all measures of latency time, staying time, and closest distance. This result imply that Bush Warbiers in the region did not discriminate the difference between intra- and inter-population songs. It may be the reason that the regional males have little Interactions In song exchange with neighbors by keeping a long Individual distance. In order to investigate the signal value as species recognition releaser, playback of partial songs, prepared from tow distinct regional populations of the spedes were presented to males of the study area. The partial songs presented were made of two portions for each presentation, a whlsde portion only, and a complex syllable portion only. Territorial males responded stronger to the complex syllable portion than the whistle portion of the song. This result indicate that the complex syllable portion conveys more information on the species recognition. As 'releaser' hypothesis suggested formerly, a function of the complex syllable portion In Bush Warbler song is understood In which conveys most spedesIdentifying information. Thus, the result of this playback experiments supports the releaser hypothesis.

충북 청원군 일대에서 휘파람새 6 개체에 대하여 군집내 인 청원군집의 song과 군집외 인 제주개체의 song을 이용하여 playback실험을 실시하였다. 실험의 대상개체는 모두 다두 군집의 song에 대하여 강한 반응을 보였으나 군집 사이에 대하여 통계적으로 의미 있는 차이를 나타내지는 않았다. 이러한 결과는 청원군집내의 개체간의 먼 간격으로 인하여 이웃 개체간의 적은 상호작용에서 기인되어지는 것으로 판단된다. Song의 부분들이 song의 인식에 기여하는 정도를 파악하기 위하여, 휘파람새 song의 whistle 부분과 complex syllsble 부분을 이용하여 playback실험을 실시하였다. Complex syllable 부분에 대한 반응의 정도가 whistle 부분에 비하여 의미 있게 높았으며, 이러한 것은 song의 특정한 부분이, complex syllable, 개체의 song인식에 필요한 주된 정보를 담고 있다는 'releaser '가설을 지지하는 결과로 나타났다.