Seasonal changes in song and invasion progress of introduced Chinese Hwamei Garrulax canorus from confirmation rates at Yokohama Nature Sanctuary

Abstract

The confirmation rates of Chinese Hwamei in Yokohama Nature Sanctuary were reviewed based on 6 years of observation data from 2010 to 2015. According to these results, the population of Chinese Hwamei rapidly increased between 2010 and 2013, followed a moderate increase rate. This suggests that in 2013 the population of Chinese Hwamei in the sanctuary may almost be saturated. Additionally, starting from 2013, the seasonal song confirmation rates were reviewed based on 3 years of observation data. The results suggest that they sing the most in spring followed by summer and autumn.