Abundance of Long-billed Curlews on military lands in the Columbia Basin

IF 1.4 4区环境科学与生态学 Q3 BIODIVERSITY CONSERVATION

Avian Conservation and Ecology Pub Date : 2024-05-31 DOI:10.5751/ace-02616-190114

Sharon A. Poessel, Elise Elliott-Smith, Sean P. Murphy, Susan M. Haig, Adam E. Duerr, Todd E. Katzner

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引用次数: 0

Abstract

Long-billed Curlews (Numenius americanus) are declining throughout North America, and the loss of grassland breeding habitat is one of the primary threats to the species. Intermountain West, in particular, has been identified as the most important region in North America for breeding curlews. Nevertheless, the density and abundance of Long-billed Curlews in this region is not well understood. Lands managed for military training can provide habitat for wildlife species of conservation concern, and increasingly these lands are becoming relevant to sustaining biodiversity. We conducted point count surveys of Long-billed Curlews on Department of Defense lands in the Columbia Basin near Boardman, Oregon, USA during two consecutive breeding seasons. We used multinomial-Poisson mixture models to estimate detection probability and density of curlews and to investigate environmental correlates of those metrics. Mean detection probability at a distance of 400 m was 0.45 and 0.61 in 2015 and 2016, respectively. In 2015, the clarity of skies increased detection probability, but in 2016, none of the variables we measured influenced detection probability. Mean predicted density was 3.3 (95% confidence interval: 2.4–4.7) and 1.8 (1.2–2.7) curlews/km² in 2015 and 2016, respectively. In both years, curlew density was higher in lower-elevation or topographically smoother areas. Estimated abundance of curlews in the study area was 639 (456–912) and 350 (237–520) birds in 2015 and 2016, respectively. The number of curlews appeared to fluctuate across the two years of our study, a demographic trend that may have been influenced by a wildfire in our study area in June 2015. The results of our study indicate that federal grasslands, including areas where military operations are conducted, can provide conservation benefit to breeding Long-billed Curlews.

The post Abundance of Long-billed Curlews on military lands in the Columbia Basin first appeared on Avian Conservation and Ecology.

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哥伦比亚盆地军用土地上的长嘴杓鹬数量

长嘴翘嘴鸛（Numenius americanus）在整个北美洲都在减少，草原繁殖栖息地的丧失是该物种面临的主要威胁之一。山间西部尤其被认为是北美最重要的长嘴杓鹬繁殖区。然而，人们对该地区长嘴卷尾鸦的密度和数量还不甚了解。为军事训练而管理的土地可为受保护的野生动物物种提供栖息地，而且这些土地正日益成为维持生物多样性的重要场所。我们在美国俄勒冈州博德曼附近哥伦比亚盆地的国防部土地上，连续两个繁殖季节对长喙卷尾鸦进行了点计数调查。我们使用多项式-泊松混合模型来估算长嘴杓鹬的探测概率和密度，并研究这些指标的环境相关性。2015年和2016年，400米距离内的平均探测概率分别为0.45和0.61。2015 年，天空的清晰度提高了探测概率，但在 2016 年，我们测量的变量均未影响探测概率。2015 年和 2016 年的平均预测密度分别为 3.3（95% 置信区间：2.4-4.7）只和 1.8（1.2-2.7）只/平方公里。在这两年中，海拔较低或地形较平缓地区的翘嘴鸥密度较高。据估计，2015 年和 2016 年研究区域的翘嘴鹬丰度分别为 639 只（456-912 只）和 350 只（237-520 只）。在我们研究的两年中，翘嘴鹬的数量似乎有所波动，这一人口趋势可能受到了 2015 年 6 月研究区野火的影响。我们的研究结果表明，联邦草原（包括开展军事行动的地区）可为长嘴卷尾鸦的繁殖提供保护效益。

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来源期刊

Avian Conservation and Ecology BIODIVERSITY CONSERVATION-ORNITHOLOGY

CiteScore

2.20

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： Avian Conservation and Ecology is an open-access, fully electronic scientific journal, sponsored by the Society of Canadian Ornithologists and Birds Canada. We publish papers that are scientifically rigorous and relevant to the bird conservation community in a cost-effective electronic approach that makes them freely available to scientists and the public in real-time. ACE is a fully indexed ISSN journal that welcomes contributions from scientists all over the world. While the name of the journal implies a publication niche of conservation AND ecology, we think the theme of conservation THROUGH ecology provides a better sense of our purpose. As such, we are particularly interested in contributions that use a scientifically sound and rigorous approach to the achievement of avian conservation as revealed through insights into ecological principles and processes. Papers are expected to fall along a continuum of pure conservation and management at one end to more pure ecology at the other but our emphasis will be on those contributions with direct relevance to conservation objectives.