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首页> 外文期刊>Rangeland Ecology & Management >Effects of Livestock Grazing Management on Grassland Birds in a Northern Mixed-Grass Prairie Ecosystem
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Effects of Livestock Grazing Management on Grassland Birds in a Northern Mixed-Grass Prairie Ecosystem

机译：牲畜放牧管理对北方混合草原草原生态系统草原鸟类的影响

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Grassland birds have undergone substantial population declines throughout much of their historic ranges in North America. Most of the remaining grassland bird habitat is restricted to rangelands managed for livestock production, so grazing management has strong implications for grassland bird conservation efforts. We conducted 1 830 point-count surveys at 305 sites during 2016-2017 to evaluate the relative effects of three livestock grazing systems on the abundance and community composition of grassland birds in a northern mixed-grass prairie ecosystem of eastern Montana, United States. Our objectives were to 1) evaluate effects of grazing management on abundance and community composition of grassland obligate birds, focusing specifically on grazing systems, stocking rates, and interactions with rangeland productivity; 2) evaluate the importance of local vegetation characteristics for grassland birds within grazing systems; and 3) assess the effectiveness of rest-rotation grazing to create patch-heterogeneity in rangeland vegetation through the alteration of structural components and the response of grassland birds to these treatments. Overall, we found inconsistent responses in abundances of grassland birds relative to livestock grazing systems and no discernable differences among grazing systems relative to community composition. However, local abundances were often driven by interactions between grazing system and rangeland production potential, suggesting the effects of livestock grazing management were generally mediated by rangeland productivity. In addition, associations between avian abundance and grazing management parameters (e.g., stocking rate) were species specific. Ubiquitous guidelines for livestock grazing systems may be inappropriate for grassland bird conservation efforts in the northern mixed-grass prairie, and high stocking rates may negatively impact populations of dense-grass obligate grassland birds in this region. (C) 2019 The Society for Range Management. Published by Elsevier Inc. All rights reserved.
机译：草地鸟类在北美的大部分历史范围内都经历了大量的人口下降。大多数剩余的草地鸟类栖息地仅限于为牲畜生产管理的牧场，因此放牧管理对草原鸟类保护努力产生了强烈影响。在2016 - 2017年，我们在305个地点进行了1 830点计数调查，以评估三个牲畜放牧系统对美国东部蒙大拿州北部混合草原草原生态系统的草地鸟类丰富和社区组成的相对效果。我们的目标是1）评估放牧管理对草原大胆鸟类的丰富和社区组成的影响，专注于放牧系统，储能率和与牧场生产力的互动; 2）评价放牧系统内草地鸟类局部植被特征的重要性; 3）评估休息旋转放牧的有效性通过改变结构部件和草地鸟类对这些治疗的响应来创造Rangeland植被的补丁异质性。总体而言，我们发现在相对于牲畜放牧系统的草地鸟类丰富的反应不一致，并且相对于社区成分没有放牧系统的可辨别差异。然而，局部丰富通常是通过放牧系统和牧场生产潜力之间的相互作用驱动的，这表明牲畜放牧管理的影响通常是由牧场生产率的介导的。此外，禽流率和放牧管理参数（例如，载载率）之间的关联是特定的物种。无处不在的牲畜放牧系统指南可能不适合北方混合草原草原的草地鸟类保护努力，高储存率可能会对这一地区的密集草原草原鸟类产生负面影响。 （c）2019年系列管理协会。由elsevier Inc.保留所有权利发布。

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