All Neotropical primates are arboreal and thus depend on forests for their survival. Arboreality puts many Neotropical primates at risk of extinction due to the high rates of deforestation in the tropics. We assessed the influence of vegetation structure and forest patch attributes on the occurrence of the threatened red‐handed howler monkey (Alouatta belzebul) in an Amazonian savanna. Using a sample of 38 forest patches in a region of approximately 2000 km² in the state of Amapá, northern Brazil, we used logistic regression to find the best predictors of the occurrence of A. belzebul. We assessed patch area, patch isolation, the proportion of seasonally flooded forest in the patch, the density of flooded area palms, forest height, canopy cover, and diameter at breast height of trees. Patch area and palm density were the best predictors of the occurrence of A. belzebul in forest patches, both having a positive effect on the probability of occurrence. Our results indicate that areas of flooded forest in forest patches may be keystone habitats for A. belzebul living in Amazonian savannas. The observed effect of palm density on A. belzebul suggests that this variable is useful for planning conservation actions, including the selection of areas for protection and management strategies for areas inhabited by this primate.

中文翻译：

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亚马逊热带稀树草原上红手how猴（Alouatta belzebul）的发生与森林斑块面积和淹水区棕榈的密度有关

所有新热带灵长类动物都是树栖动物，因此赖以生存。由于热带地区的高森林砍伐率，树木的习性使许多新热带灵长类动物面临灭绝的风险。我们评估了植被结构和森林斑块属性对亚马逊大草原中濒临灭绝的red叫猴（Alouatta belzebul）的发生的影响。我们使用巴西北部阿马帕州约2000 km ²区域中38个森林斑块的样本，通过逻辑回归找到了A. belzebul发生的最佳预测因子。我们评估了斑块面积，斑块隔离度，斑块中季节性被淹森林的比例，被淹区域棕榈的密度，森林高度，冠层覆盖度和树木胸高的直径。斑块面积和棕榈密度是森林斑块中A. belzebul发生的最佳预测指标，两者均对发生概率具有积极影响。我们的结果表明，森林斑块中被淹没的森林地区可能是生活在亚马逊热带稀树草原中的A. belzebul的主要栖息地。观察到的棕榈密度对A. belzebul的影响表明，该变量可用于计划保护行动，包括选择该灵长类动物栖息地的保护区域和管理策略。