Community structure of birds at Yanyuan, Peking University

From 2003 to 2012, 446 times of survey had been conducted on community structure of birds at Yanyuan, Peking University. 234 of them, on which 468 hours had been spent from 2010 to 2012, were weekly transact surveys, twice in spring and autumn while once in summer and winter. Up to 178 species, belonging to 102 genera of 37 families of 14 orders, had been recorded. Among them, there are 24 residents, 117 migrants, 24 summer visitors, 19 winter visitors and 1 vagrant. One of them is listed as the 1st class of China National Protected Wildlife, whilst 20 species as the 2nd class. 28 species of waterbirds were recorded. On different sub-regions of Yanyuan, the most species-poor one is Jingyuan, where only 28 species were recorded. The most species-rich one is Mingheyuan, where 109 species were recorded. The mosaic landscape of meandering swamps and mounds covered by semi-natural secondary forest in Mingheyuan and Jingchunyuan accommodates the richest bird community in Yanyuan. 73 species were restricted to these sites. The ratios of secondary forests and greenbelts in each sub-region are chief factors affecting the abundance of bird species.