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Migratory bird habitat use in southern Mexico: mist nets versus point counts

机译:墨西哥南部候鸟栖息地的使用:薄雾网与点数

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Most previous studies of habitat use by migratory birds in the tropics have used either mist nets or point counts to assess relative densities of migrants among babitats. We used both methods on the same 30 sites in southern Veracruz: 10 sites in forest (canopy >10 m), 10 sites in second growth (canopy-3-10 m), and 10 sites in the open (canopy <3 m). Results demonstrate that either method used alone is likely to underestimate or miss whole Categories of species. Three aerial or canopy-foraging species found on point counts were Missed by mist netting, while several others in these categories were under-represented in Mist net samples, especially in forest habitats.
机译:以前,在热带地区,大多数候鸟使用栖息地的研究都使用薄雾网或点数来评估栖息地中移民的相对密度。我们在韦拉克鲁斯州南部的相同30个站点上使用了这两种方法:森林中的10个站点(树冠> 10 m),第二次生长的10个站点(树冠-3-10 m)和露天的10个站点(树冠<3 m) 。结果表明,单独使用这两种方法都可能低估或遗漏整个物种类别。薄雾网漏掉了在点数上发现的三种空中觅食或树冠觅食物种,而在薄雾网样本中,特别是在森林栖息地中,这些类别中的其他几种则不足。

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