Forest fragmentation modifies habitat quality for Alouatta palliata
Forest fragmentation modifies habitat quality for Alouatta palliata
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DOI：
10.1007/s10764-006-9061-0
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发表时间：
2006-08-01
影响因子：
2.5
通讯作者：
Mandujano, Salvador
中科院分区：
文献类型：
--
作者：
Arroyo-Rodriguez, Victor;Mandujano, Salvador
破碎化减少了栖息地面积，增加了栖息地斑块的数量，减少了它们的大小，并增加了斑块隔离。对于树栖哺乳动物，如吼猴（Alouatta palliata），冠层的碎片化过程中的修改也可能产生负面影响的栖息地质量。我们分析了15个片段（1-76公顷）的组成和植物结构的变化，并将其与墨西哥洛斯塔斯的连续热带雨林保护区（700公顷）的植被进行了比较。在每个地点，我们对1000 m（2）胸高直径（DBH）>= 10 cm的所有树木、灌木和藤本植物进行了采样。我们获得了物种丰富度，密度和断面积的估计，不同的生态组，胸径范围，和顶级的食物资源吼。我们使用了逐步多元回归分析，以确定片段特征（大小，形状指数，隔离）和植物变量之间的关系。与连续森林相比，碎片的组成和植物结构发生了变化，树冠中没有大型树木。连层林分顶端食物资源断面积较高。碎片大小是对组成和植物结构差异的最好解释。最大的碎片有更大的断面积的顶部食物资源和更多的大的主要树木在冠层。总体而言，我们的研究结果表明，破碎化改变了吼猴的栖息地质量。
Fragmentation reduces habitat area, increases the number of habitat patches, decreases their size, and increases patch isolation. For arboreal mammals such as howlers (Alouatta palliata), canopy modifications from fragmentation processes could also negatively affect habitat quality. We analyzed changes in the composition and plant structure of 15 fragments (1-76 ha) and compared them with vegetation from a continuous tropical rain forest reserve (700 ha) in Los Tuxtlas, Mexico. At each site, we sampled 1000 m(2) of all trees, shrubs, and lianas with a diameter at breast height (DBH) >= 10 cm. We obtained estimates of species richness, density, and basal area for different ecological groups, DBH ranges, and top food resources for howlers. We used a stepwise multiple regression analysis to determine relationships between fragment characteristics (size, shape index, and isolation) and plant variables. Compared to continuous forest, fragments have altered composition and plant structure, with large trees absent from the canopy. The basal area of top food resources is higher in continuous forest. Fragment size is the best explanation for the differences in composition and plant structure. The largest fragments had greater basal area of top food resources and more large primary trees in the canopy. Overall, our results suggest that fragmentation altered the habitat quality for howlers.