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首页> 外文期刊>Canadian Journal of Zoology >Nest-site selection in the Canada Warbler (Wilsonia canadensis) in central New Hampshire
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Nest-site selection in the Canada Warbler (Wilsonia canadensis) in central New Hampshire

机译：在新罕布什尔州中部的加拿大莺（Wilsonia canadensis）中进行巢穴选择

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摘要

Reproductive success in birds is largely influenced by nest-site selection. Nest predators are the greatest source of nest failure for most species of birds. Species that nest on the ground may be particularly adapted to maximally conceal nests to reduce the risk of loss to predators. Little is known about nest-site selection in the Canada Warbler (Wilsonia canadensis (L., 1766)), a small ground-nesting Neotropical migrant. We predicted higher amounts of vegetative cover at successful nests of Canada Warblers compared with unsuccessful nests because detection by predators would decrease with greater cover. We measured vegetative characteristics (concealment, stem densities, ground cover) around each nest and compared these variables between successful and unsuccessful nests and between actual nests and mock nest sites on and off territories. Greater concealment and higher stem densities were the main features surrounding a successful nest site. Nest sites had significantly greater concealment when compared with both random mock nest sites on and off territories. Thus, concealment is important for this ground nester and achieved primarily through thick cover and strategic nest placement in vertical substrate with an inconspicuous opening to the nest cup. Forests with complex ground structure and thickets of small-stemmed woody plants should be targets of conservation when considering how to manage this declining species.
机译：鸟的繁殖成功很大程度上受巢位选择的影响。巢捕食者是大多数鸟类造成巢败的最大原因。可以在地面上筑巢的物种特别适合最大程度地掩盖巢穴，以减少食肉动物损失的风险。对加拿大莺（Wilsonia canadensis（L.，1766））的巢穴选择知之甚少。我们预测，与不成功的巢相比，在加拿大莺的成功巢中会有更多的植物覆盖，因为捕食者的发现会随着更大的覆盖而减少。我们测量了每个巢附近的植物营养特征（遮盖力，茎密度，地被植物），并比较了成功巢与失败巢之间，实际巢与区域内外模拟巢之间的这些变量。更大的隐蔽度和更高的茎密度是成功筑巢地点的主要特征。与在领土内外的随机模拟巢穴相比，巢穴的隐蔽性要大得多。因此，隐蔽对于这种地面筑巢器很重要，主要是通过在垂直的基质中厚厚的覆盖物和战略性的巢穴放置以及对巢杯不明显的开口来实现的。在考虑如何管理这种不断减少的物种时，应将具有复杂地面结构和小茎木本植物丛生的森林作为保护对象。

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