Males of euglossine bees, also known as orchid bees, are attracted to aromatic compounds and this feature has been exploited to collect them. Here we sampled orchid bee males using a rapid passive method in a Neotropical savanna ecosystem in Rio Preto State Park (PERP), southeastern Brazil. The sampling protocol consisted of 5-day surveys using scent traps at the beginning and end of the rainy seasons. PERP is inserted in a Brazilian savanna characterized by a mosaic of vegetation types, and elevational gradients. We also analyzed whether the habitat complexity and elevational gradients influence the richness and abundance of these bees. We collected a total of 996 individuals belonging to 14 species and four genera (Eufriesea Cockerell 1908, Euglossa Latreille 1802, Eulaema Lepeletier 1841, and Exaerete Hoffmannsegg 1817). Comparing our results with previous sampling protocols at PERP, higher abundance and richness were observed using traps than insect nets to survey these bees. In addition, the orchid bee fauna in PERP was successfully assessed by our rapid passive protocol, showing that this protocol seems to be useful for collecting orchid bees in open vegetation environments. We observed that the abundance of bees was lower at higher elevations, and both abundance and richness increased in more complex habitat. This may be due to the characteristics of Brazilian savannas where the lower elevations have higher habitat complexity, with more places for nest construction and resources for feeding and nesting.

Euglossine 蜜蜂（也称为兰花蜜蜂）的雄性被芳香化合物所吸引，并已利用这一特征来收集它们。在这里，我们使用快速被动方法在巴西东南部里约普雷图州立公园 (PERP) 的新热带稀树草原生态系统中对雄性兰花蜜蜂进行了采样。抽样方案包括在雨季开始和结束时使用气味陷阱进行的为期 5 天的调查。PERP 被插入到以植被类型和海拔梯度为特征的巴西稀树草原中。我们还分析了栖息地的复杂性和海拔梯度是否会影响这些蜜蜂的丰富度和丰度。我们共收集了属于 14 种和 4 属的 996 个个体（Eufriesea Cockerell 1908，Euglossa Latreille 1802，Eulaema Lepeletier 1841 和Exaerete Hoffmannsegg 1817）。将我们的结果与 PERP 之前的采样方案进行比较，使用陷阱而不是昆虫网来调查这些蜜蜂，观察到更高的丰度和丰富度。此外，我们的快速被动协议成功评估了 PERP 中的兰花蜜蜂动物群，表明该协议似乎对在开放植被环境中收集兰花蜜蜂很有用。我们观察到，海拔越高蜜蜂的丰度越低，而在更复杂的栖息地中，蜜蜂的丰度和丰富度都增加了。这可能是由于巴西热带稀树草原的特点，海拔较低，栖息地复杂性更高，有更多的筑巢场所和觅食筑巢资源。