The present study investigated the occurrence of passalids in dead trunks with structural variations. Trunks were found in areas of white sand forests, locally known as Campinarana, in the state of Amazonas, Brazil. The collections were extended from May to December 2009. The mean diameter of the trunks and their stage of decomposition were classified, and the species of Passalidae were classified according to the location of their galleries. We used multiple generalized models to investigate the relationship between abundance and permutational multivariate analysis of variance (PERMANOVA) to investigate the relationships between predictors and passalid composition. A total of 361 passalids belonging to 13 species were collected from 11 tree species, of which Aldina heterophylla represented the highest proportion of logs (55%). Only the diameter of the trunk was related to the abundance of species, with trunks of larger diameters presented more individuals. The passalid composition was correlated with the diameter and decomposition of the trunks of all species of trees and only with the diameter of the trunks of A. heterophylla. Most of the species collected in Campinaranas construct their galleries in two or more regions of the trunk. The region that supported a greater number of colonies was the sapwood, followed by the inner bark and the soil-stem interface. The general habit of passalids found may be advantageous, probably to compensate for the low dispersion and isolation in areas with low availability of resources, such as Campinaranas forests in the Amazon.

中文翻译：

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死树干结构变化对亚马逊中部Campinaranas的Passalid（鞘翅目：Passalidae）组合的影响。

本研究调查了死树干中具有结构变化的Passalids的发生。在巴西亚马孙州的白色沙林地区（当地称为Campinarana）发现了树干。收集从2009年5月扩展到2009年12月。对树干的平均直径及其分解阶段进行分类，并根据其画廊的位置对Passalidae的种类进行分类。我们使用多个广义模型来研究丰度和方差多元排列分析（PERMANOVA）之间的关系，以研究预测变量与Passalid组成之间的关系。从11个树种中总共收集了361种属于13种树的Passalids，其中Aldina heterophylla代表最高比例的原木（55％）。仅树干的直径与物种的丰富度有关，直径较大的树干代表更多的个体。Passalid的组成与所有树种的树干的直径和分解有关，而与太子参的树干的直径有关。在坎皮纳拉纳斯（Campinaranas）收集的大多数物种都在树干的两个或多个区域中建立了自己的画廊。支持较多菌落的区域是边材，其次是内部树皮和土壤-茎干界面。发现的Passalids的一般习惯可能是有利的，可能是为了弥补资源匮乏地区（如亚马逊河的Campinaranas森林）中的低分散和隔离。