Species Composition of Neotropical Understory Bird Communities: Local Versus Regional Perspectives Based on Capture Data
Species Composition of Neotropical Understory Bird Communities: Local Versus Regional Perspectives Based on Capture Data
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DOI：
10.1111/j.1744-7429.2008.00445.x
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发表时间：
2009-01-01
期刊：
影响因子：
2.1
通讯作者：
Loiselle, Bette A.
中科院分区：
文献类型：
--
作者：
Blake, John G.;Loiselle, Bette A.
在未受干扰的新热带森林林下发现的鸟类群落的物种丰富度和组成在当地和区域尺度上各不相同，但这种变化的程度还没有得到很好的记录。然而，这种变化对于理解多样性的模式和保护可能是重要的。在这里，我们使用捕获数据从两个约100公顷的研究地块（从2001年3月至2005年3月采样），比较林下组合在当地规模的网络上的地块分开约1.7公里，在最近的点。在6023捕获的4001个人，共157种（133每情节）。在排除了不太可能用网很好地采样的物种后，两个样地共有122种，分别为110种和113种。物种积累曲线和丰富度等级关系几乎相同的两个地块。捕获率高（53和56鸟捕获每100雾净小时，mnh）在这两个地块。科属间物种和个体的分布在两个地块上相似，但一些常见物种的捕获数量在地块间因环境特征的小尺度变化而不同。指示种分析选择了7个物种的一个情节和9个更有特色的其他更多的特点。在区域一级，林下组合是最相似的网站在秘鲁，但不同的网站在巴西，委内瑞拉，特别是哥斯达黎加。只有当哥斯达黎加包括在分析中，每个家庭的物种丰富度的差异与地理距离。
Species richness and composition of bird assemblages found in the understory of undisturbed Neotropical forests vary at local and regional scales but the extent of that variation has not been well documented. Yet, such variation can be important for understanding patterns of diversity and for conservation. Here, we use capture data from two ca 100-ha study plots (sampled from March 2001 through March 2005) to compare understory assemblages at a local scale; nets on the plots were separated by approximately 1.7 km at the closest point. A total of 157 species (133 per plot) was represented in 6023 captures of 4001 individuals. After eliminating species not likely to be well-sampled with nets, there were 122 species total with 110 and 113 on the two plots, respectively. Species-accumulation curves and abundance-rank relationships were almost identical on both plots. Capture rates were high (53 and 56 birds captured per 100 mist-net-hours, mnh) on both plots. Distributions of species and individuals among families and genera were similar on the two plots but numbers of captures of some common species differed between plots in response to small-scale variation in environmental features. Indicator-species analyses selected seven species as more characteristic of one plot and nine as more characteristic of the other. At the regional level, understory assemblages were most similar to a site in Peru but differed from sites in Brazil, Venezuela, and, especially, Costa Rica. Dissimilarity in species richness per family was related to geographic distance only when Costa Rica was included in the analysis.