上海青浦地区3 种鹭科鸟类活动性和栖息地利用的卫星追踪

To detect the annual activity patterns and habitat use of mixed breeding birds in Ardeidae at the suburbs of Shanghai, GPS-GSM transmitters were deployed on Chinese pond heron (Ardeola bacchus), little egret (Egretta garzetta) and black-crowned night heron (Nycticorax nycticorax) at Qingpu Country Park in June and July 2018. The movements of one Chinese pond heron, two little egrets and two black-crowned night herons were obtained (86—377 days for each individual) for analysis. Results showed that all the three species left the nesting site after breeding season, while they were not far away from the nesting site. There were both intraspecific and interspecific differences in their home range. The Chinese pond heron and the little egret exhibited similar activity rhythm, with generally moving at the daytime and resting at night. The Chinese pond heron mainly used woodland and lotus ponds at both day and night; while the little egrets mainly used farmland in the daytime and woodland at night. The black-crowned night heron exhibited intense movement at night, although they also moved in the daytime. There were large differences in habitat use between the two individuals of the black-crowned night heron. The little egret that was tracked for a whole year exhibited an increase of home range in winter. This might be related to the decreased available food in cold season. Although the sample size is small, the results indicate that the three species exhibited large temporal and spatial differences in habitat use. Artifical habitats are extensively used by all the three species, suggesting that agricultural activities at suitable intensity would not disadvantageously affect their population maintenance.