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Predictors of Bachman's Sparrow Occupancy at its Northern Range Limit

机译：巴赫曼的麻雀占据北方范围限制的预测因素

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摘要

Peucaea aestivalis (Bachman's Sparrow), a songbird endemic to the southeastern US, has experienced long-term population declines and a northern range-boundary retraction. Habitat loss and degradation, largely related to fire suppression, are believed to be the major causes of population declines, but these relationships are less studied at the northern range-extent. Hence, we investigated habitat selection of Bachman's Sparrow on Fort Bragg Military Installation, where vegetation is characterized by extensive fire-maintained Pinus palustris (Longleaf Pine) uplands. We surveyed breeding male sparrows using repeat-visit point-counts. We visited 182 points 3 times from April to July during the 2014 and 2015 breeding seasons. We measured vegetation and distance to other habitat features (e.g., wildlife openings, streams) at each point. We recorded presence or absence of Bachman's Sparrows and fit encounter histories into a single-season occupancy model in program Unmarked, including a year effect on detection. Occupancy probability was 0.52 and increased with greater grass-cover and at intermediate distances from wildlife openings, and decreased with years-since-fire and with greater shrub height. Predictors of Bachman's Sparrow occupancy were similar to those reported for other portions of the range, supporting the importance of frequent prescribed fire to maintain herbaceous groundcover used by birds for nesting and foraging. However, our study indicated that other habitat features (e.g., canopy openings) provided critical cover within extensive upland Longleaf Pine-Aristida stricta (Wiregrass) forest.
机译：Peucaea Aestivis（Bachman的麻雀）是一个鸣禽流行的美国东南部，经历了长期人口下降和北方范围边界撤回。栖息地丧失和降解，与火灾抑制很大，被认为是人口下降的主要原因，但这些关系较少在北方范围内研究。因此，我们调查了Bachman在Bragg Fort Bragg军事安装上的栖息地选择，其中植被的特点是广泛的防火Pinus Palustris（Longleaf Pine）高地。我们使用重复访问点计数调查育种男性麻雀。 2014年和2015年育种季节，我们在4月至7月访问了182分3次。我们在每个点测量植被和与其他栖息地特征（例如，野生动物开口，流）的距离。我们记录了Bachman的麻雀的存在或缺席，并将历史融入了未标记的程序中的单赛季占用模式，包括对检测的一年影响。占用概率为0.52，随着草覆盖和野生动物开口的中间距离增加，并随着较少的灌木高度而减少。巴赫曼的麻雀占用的预测因素类似于据报道的范围的其他部分，支持频繁规定的火灾的重要性，以维持鸟类使用的草本地面用于筑巢和觅食。然而，我们的研究表明，其他栖息地特征（例如，Canopy Opents）在广泛的Upland Longleaf Pine-Aristida Stricta（Wiulgrass）森林中提供了关键封面。

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  • 来源
    《Southeastern naturalist》 |2018年第1期|共13页
  • 作者

    Fish Alexander C.; Moorman Christopher E.; DePerno Christopher S.; Schillaci Jessica M.; Hess George R.;

  • 作者单位

    North Carolina State Univ Fisheries Wildlife &

    Conservat Biol Program Raleigh NC 27695 USA;

    North Carolina State Univ Fisheries Wildlife &

    Conservat Biol Program Raleigh NC 27695 USA;

    North Carolina State Univ Fisheries Wildlife &

    Conservat Biol Program Raleigh NC 27695 USA;

    Directorate Publ Works Endangered Species Branch Ft Bragg NC 28310 USA;

    North Carolina State Univ Dept Forestry &

    Environm Resources Raleigh NC 27607 USA;

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  • 正文语种 eng
  • 中图分类 自然地理学;
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