Distribution and migration patterns of Egretta garzetta in Zhejiang Province

To study distribution characteristics and migration laws of Egretta garzetta from the angle of statistics and to plot migration routes, daily monitoring data of wild animal epidemic sources and disease systems for birds of Zhejiang Province were collected. Monitoring data for the five years from 2010-2014 were analyzed by combined K-means clustering distribution to preliminarily plot two migration routes. Results indicated a northward migration path in spring of Yinzhou, NingboShangyu, ShaoxingYuhang, HangzhouDeqing, Huzhou; Yinzhou, Ningboover the sea; Sanmen, Taizhouover the sea. The Southward migration path in autumn was Deqing, HuzhouYuhang, HangzhouShangyu, ShaoxingYinzhou, NingboSanmen, Taizhou. Then data from Deqing Monitoring Station was selected to develop a regression equation of environmental factors that influenced changes in the number of E. garzetta. Above analysis of E. garzetta activities showed patterns of migration timing, migration paths, and quantity changes in Zhejiang Province. ［Ch, 5 fig. 5 tab. 15 ref. ］