Wolfe Jared D, Johnson Matthew D, Ralph C John
School of Renewable Natural Resources, Louisiana State University Agricultural Center and Louisiana State University, Baton Rouge, Louisiana, United States of America ; Department of Wildlife, Humboldt State University, Arcata, California, United States of America.
Department of Wildlife, Humboldt State University, Arcata, California, United States of America.
PLoS One. 2014 Jan 28;9(1):e86221. doi: 10.1371/journal.pone.0086221. eCollection 2014.
Nearctic-neotropic migrant birds need to replenish energy reserves during stopover periods to successfully complete their semiannual movements. In this study we used linear models to examine the habitat use of 11 migrant species in northeastern Costa Rica to better understand the influence of food and structural resources on the presence of birds during stopover periods. Our models indicated that frugivorous migrants primarily used food abundance, while insectivorous migrants chiefly used vegetation structure as cues for habitat use during stopover. In addition to habitat use models, we documented fruiting plant phenology and found a general relationship between migrant arrival and the timing of ripe fruit availability. Our results suggest that insectivorous migrants probably rely on structural features when using habitat because it may be inherently difficult to assess cryptic-arthropod availability during a short period of time in a novel habitat, such as stopover periods.
新北区-新热带区的候鸟在中途停留期间需要补充能量储备，以便成功完成它们的半年一次的迁徙。在本研究中，我们使用线性模型来研究哥斯达黎加东北部11种候鸟的栖息地利用情况，以更好地了解食物和结构资源对中途停留期间鸟类出现的影响。我们的模型表明，食果性候鸟主要利用食物丰富度，而食虫性候鸟在中途停留期间主要利用植被结构作为栖息地利用的线索。除了栖息地利用模型，我们还记录了结果植物的物候，并发现候鸟到达与成熟果实可获得时间之间存在一般关系。我们的结果表明，食虫性候鸟在利用栖息地时可能依赖结构特征，因为在一个新的栖息地（如中途停留期）短时间内评估隐秘节肢动物的可获得性可能本身就很困难。
