Modifications in the structure of grasslands have been responsible for the decline of several avian species due to a reduced quality in available habitat. Currently, applications of the herbicide glyphosate have been introduced to promote winter forage production in the Flooding Pampas of Argentina. Rotational grazing has been another technique used to promote winter forage production. Here, we evaluated different grasslands managements in cattle production systems on species richness, composition, and abundance of bird assemblages in grasslands Pampas. We put emphasis on responses of two neartic migratory shorebirds, the Buff-breasted Sandpiper (Calidris subruficollis) and the American Golden Plover (Pluvialis dominica). The three treatments on natural grassland were: (1) paddocks of Ryegrass growth promotion through the application of herbicide glyphosate; (2) paddocks managed with Rotational grazing, and 3) paddocks managed with Continuous grazing. We considered three periods of the breeding cycle of the birds (early, late, post-breeding) for two years (2011/2012, 2012/2013). Vegetation cover lower than 10 cm was greater in both Rotational and Continuous grazing sites in comparison to the ryegrass promotion sites. A NMDS analysis revealed a clear separation in structure of bird communities among the three grazing treatments. The abundance of total birds and of short grassland birds was lower in grasslands with Ryegrass promotion. An indicator species analysis revealed the associations of shorebirds with Rotational and Continuous grazing sites. Grassland management with glyphosate application had an effect on the structure of assemblages of grassland birds in the Flooding Pampas, which was negative particularly with Nearctic migrants of conservation importance.

由于可用栖息地的质量下降，草原结构的改变是导致几种鸟类数量减少的原因。目前，已引入除草剂草甘膦的应用，以促进阿根廷洪水泛滥的潘帕斯草原的冬季牧草生产。轮牧是另一种用于促进冬季牧草生产的技术。在这里，我们评估了牛生产系统中不同草原管理对潘帕斯草原鸟类组合的物种丰富度、组成和丰度。我们重点关注了两种近海迁徙滨鸟的反应，即浅胸鹬 ( Calidris subruficollis ) 和美洲金鸻 ( Pluvialis dominica）。天然草地的三种处理分别是：（1）通过施用除草剂草甘膦促进黑麦草生长的围场；(2) 轮牧管理的围场，和 3) 连续放牧管理的围场。我们考虑了两年（2011/2012、2012/2013）鸟类繁殖周期的三个时期（早期、晚期、后期）。与黑麦草推广地点相比，轮牧和连续放牧地点的植被覆盖率低于 10 厘米。NMDS 分析揭示了三种放牧处理之间鸟类群落结构的明显分离。在黑麦草推广的草原中，鸟类总数和短草原鸟类的丰度较低。指标物种分析揭示了滨鸟与轮转和连续放牧地点的关联。