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首页> 外文期刊>Rangeland Ecology & Management >Habitat Targets for Imperiled Grassland Birds in Northern Mixed-Grass Prairie
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Habitat Targets for Imperiled Grassland Birds in Northern Mixed-Grass Prairie

机译：栖息地针对北部混合草大草原的危机鸟类

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Grassland bird populations are declining faster than any other avian guild in North America, and promotion of favorable habitat conditions in rangeland breeding cores is important for their maintenance. There is much information on associations between breeding grassland songbirds and vegetation attributes. However, previous results have been difficult to translate into management practices due to mismatch between the scale and metrics used in biological sampling and those used in management. Here, we evaluate the response of imperiled grassland bird species to vegetation conditions using metrics and scales accessible to managers. We focus on four species that are experiencing particularly severe population declines: Baird's sparrow (Centronyx bairdii), chestnut-collared longspur (Calcarius omatus), McCown's longspur (Rynchophanes mccownii), and Sprague's pipit (Anthus spragueii). In 2017 and 2018, we evaluated the abundances of these species within their core distributions in northern Montana. We used temporally replicated point-counts and hierarchical models to estimate abundance and associations with plot-level (9-ha) vegetation conditions while accounting for spatially and temporally variable detectability. Exotic grass encroachment and shrub cover had negative or neutral effects on all species. Birds responded strongly to biomass at this scale, with chestnut-collared longspurs and Sprague's pipit preferring a range of 1 100 kg ha(-1) to 1 400 kg ha(-1), and McCown's longspurs selecting for the lowest available. Residual grass and litter cover were important for Baird's sparrows. Variable results among species emphasize the need for heterogeneity in vegetation structure and composition at scales larger than the plot. Our results provide guidance for managers interested in improving habitat for these species. (C) 2020 The Society for Range Management. Published by Elsevier Inc. All rights reserved.
机译：草地鸟类群体的速度比北美的任何其他禽流公会更快，而在牧场养殖核心的促进栖息地条件促进对其维护很重要。有关繁殖草原鸣禽与植被属性之间的关联信息。然而，由于生物采样中使用的规模和指标与管理中使用的标准之间的不匹配，因此难以转化为管理实践。在这里，我们评估了管理人员可访问的指标和秤的植物草地鸟类对植被条件的响应。我们专注于四种正在经历特别严重的人口的物种下降：Baird的麻雀（Centronyx Bairdii），栗子衣领长班（Calcarius Omatus），McCown的Longshur（Rynchophanes McCownii）和Sprague的潜水艇（Anthus Spragueii）。 2017年和2018年，我们在蒙大拿北部的核心分布中评估了这些物种的丰富。我们使用时间上复制的点计数和分层模型来估计与绘图级（9-HA）植被条件的丰富和关联，同时占空间和时间可变的可变可检测性。异国情调的草侵蚀和灌木覆盖物对所有物种具有负面或中性的影响。鸟类在这种规模上对生物质反应，用栗子雄性的长寿和Sprague的潜水员更倾向于1 100公斤HA（-1）至1 400公斤HA（-1），以及McCown的LongSpurs选择最低可用的LongSpurs。残留的草和垃圾封面对于贝尔德的麻雀很重要。物种之间的变化结果强调了对植被结构的异质性，并且在大于曲线的鳞片上的组成。我们的结果为有兴趣改善这些物种的栖息地的经理提供指导。 （c）2020范围管理协会。由elsevier Inc.保留所有权利发布。

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