甘肃盐池湾国家级自然保护区斑头雁繁殖期食性分析

Analysis of dietary of bar-headed geese inhabited in Gansu Yanchiwan National Nature Reserve in breeding period

2019年4月至6月在甘肃盐池湾国家级自然保护区大德尔基和小德尔基湿地斑头雁繁殖点进行食性调查,分别在觅食地采集参照植物和繁殖前期、中期、后期、末期粪便进行显微分析。结果表明:斑头雁在繁殖期内主要取食11科19种植物,莎草科植物为主要取食对象,在繁殖期内平均占比43.14%。除莎草科植物以外,在繁殖期不同阶段对其他植物取食偏好有所不同。前中期取食三脉梅花草较多,后、末期取食小眼子菜、海韭菜等水生植物较多。在整个繁殖期内,取食花果的比例呈线性增长。

From April to June 2019,a food survey was conducted at the breeding sites of bar-headed geese in the Xiaoderji and Daderji wetlands in the Gansu Yanchiwan National Nature Reserve.The reference plants were collected in the foraging ground and the feces in the early,middle,late and late stages of breeding were collected and microscopic analysis was performed.The results showed that the bar-headed geese mainly consumed plants of 11 families and 19 during the breeding period.The Cyperaceae plants were the main foods,accounting for an average of 43.14%of foods during the breeding period.Except Cyperaceae plants,feeding preferences of geese for other plants varied at different stages of the breeding season.In the first half of the breeding period,there were more Parnassia trinervis,in late stages more aquatic plants such as Potamogeton pusillus and Glaux maritima were taken.Throughout the breeding season,the proportion of flowers and fruits in geese`s food showed a linear increase.