Mid-winter waterfowl count, Estonian national monitoring 1991-2016

Waterfoul species individuals counts in monitoring sectors. The monitoring was performed in Estonian territorial waters in 1991-2016各监测区域内水禽（Waterfowl）物种的个体数量统计。本次监测于1991年至2016年间在爱沙尼亚领海范围内开展。