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The Effect of Artificial Lighting at Night on Activity Pattern and Vocal Bahavior of Male Taiwan Whistling Thrush (Myiophoneus insularis)
Taiwan whistling thrush
The artificial lighting at night has caused many impacts on the surroundings. To evaluate how artificial lighting at night has alter the behaviour and the activity pattern of Taiwan Whistling Thrush（Myiophoneus insularis）.The investigations had been started from 2007 to 2009 ,and were composed of five parts: (1) measurements of the luminance nearby nest sites,(2) he onset of dawn chorus of male Taiwan Whistling Thrush in the breeding season, (3) the records for breeding performances, (4) mist-netting and measurements of adult thrushes, (5) activity patterns recordings. We have acquired the measurements of luminence from 26 nesting area in Shrding township, and draw those areas into two groups: 11 bright areas and 15 dark areas. Dawn choruses of male thrushes from bright area onset significantly earlier than males from dark areas. The activity patterns of 10 adult males from light areas (5) and dark areas (5) , males from light areas were active from 2 am to 7 pm, while ones from dark areas were active from 4 am to 6 pm. The thrushes from bright areas were more active at 4 am, while those from dark areas were more active at 8, 10 am and 2 pm. There were no significant differences between body measurements of adult thrushes from light and dark areas. From 2008 to 2009, we had acquired 78 nesting records. The initiate time of first brood from light and dark areas did not differed significantly, and the breeding performances and the success rate of different stages did not differed significantly neither. Our results demonstrate that: (1) artificial lighting at night did affect the diurnal activity patterns of Taiwan whistling thrush; (2) according to the initiate time of first brood did not differed, artificial lighting should not be the only factor that altered the thrushes.
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