High post-fledging survival and site persistence using mark-resight methodology for Oregon Vesper Sparrows in the Willamette Valley, Oregon

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

Avian Conservation and Ecology Pub Date : 2024-08-31 DOI:10.5751/ace-02706-190208

Bob Altman, Joel Geier, Sarah M. Rockwell

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Abstract

The ecology of the post-fledging period for small passerine birds is one of the least known stages of the avian life cycle with high rates of mortality for many species. We examined post-fledging survival and site persistence of Oregon Vesper Sparrows (Poocetes gramineus affinis) based on extensive temporal and spatial implementation of mark-resight methodology in western Oregon, 2017–2021. Our analyses focused on a comparison of descriptive apparent survival estimates (i.e., return rates) uncorrected for detectability and modeled apparent survival estimates corrected for detectability using Program MARK. Modeled survival estimates were only slightly higher than descriptive survival estimates at three weeks (0.754 and 0.689), six weeks (0.659 and 0.617), and nine weeks (0.629 and 0.561). Both estimates were lowest at three weeks post-fledging (0.754 and 0.689), and higher in weeks 3–6 (0.874 and 0.897), and weeks 6–9 (0.954 and 0.893). The best supported model included an effect of fledgling age in weeks on survival probability, and additive effects of site, effort, and week of season on detection probability. There was a live resight during the post-fledging period of at least one bird from 94.9% of the successfully fledged nests. Site persistence greater than 50 days was 0.838. Mean site persistence was 78.1 days and longest site persistence for an individual bird was 115 days. Our results suggest that an extensive mark-resight effort can address detectability concerns and provide an approximation of true post-fledging survival estimates. Our post-fledging survival estimates are the highest reported for a grassland bird, and yet they contrast with the expectations of the methodology and the literature on post-fledging survival of grassland birds, which is mostly derived from radio-tracking methodology. These results along with recent meta-analyses from other researchers raise concerns about unreported and unknown but expected mortality in grassland nestlings and fledglings from additive predation due to radio-tracking attachments and devices.

The post High post-fledging survival and site persistence using mark-resight methodology for Oregon Vesper Sparrows in the Willamette Valley, Oregon first appeared on Avian Conservation and Ecology.

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在俄勒冈州威拉米特山谷，利用标记监测方法监测俄勒冈黄麻雀羽化后的高存活率和栖息地持久性

小型雀形目鸟类羽化后的生态是鸟类生命周期中已知最少的阶段之一，许多物种的死亡率很高。我们根据 2017-2021 年俄勒冈州西部广泛实施的时空标记监测方法，研究了俄勒冈鸦雀（Poocetes gramineus affinis）羽化后的存活率和地点持久性。我们的分析侧重于比较未经可探测性校正的描述性表观存活率估计值（即回归率）和使用 MARK 计划进行可探测性校正的模型表观存活率估计值。在三周（0.754 和 0.689）、六周（0.659 和 0.617）和九周（0.629 和 0.561）时，模型存活率估计值仅略高于描述性存活率估计值。这两个估计值在羽化后三周最低（0.754 和 0.689），在三至六周（0.874 和 0.897）和六至九周（0.954 和 0.893）较高。最佳支持模型包括雏鸟周龄对存活概率的影响，以及地点、努力程度和季节周数对探测概率的加法效应。94.9%成功羽化的巢中至少有一只鸟在羽化后的时期内再次被发现。地点持续时间超过 50 天的比例为 0.838。平均站点持续时间为 78.1 天，单只鸟的最长站点持续时间为 115 天。我们的研究结果表明，广泛的标记监测工作可以解决可探测性问题，并提供真实的雏鸟哺育后存活率估计值的近似值。我们对草原鸟类雏后存活率的估计是目前所报道的最高的，但这与方法学的预期和有关草原鸟类雏后存活率的文献形成了鲜明对比，而这些文献大多是通过无线电追踪方法得出的。这些结果以及其他研究人员最近的荟萃分析引起了人们对草原雏鸟和幼鸟因无线电追踪附件和装置造成的附加捕食而导致的未报告和未知但预期死亡率的关注。

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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.