Dung beetles (Coleoptera: Scarabaeoidea) serve a significant role in regulating ecosystem services on rangelands. However, the influence of grazing management on dung beetle communities remains largely unknown. The purpose of this study was to investigate dung beetle abundance and diversity throughout the grazing season in the Nebraska Sandhills Ecoregion. Grazing treatments included: continuous grazing (CONT), low-stocking rotational grazing (LSR), high-stocking rotational grazing (HSR), and no grazing (NG). The abundance and diversity of dung beetles were measured in the 2014 and 2015 grazing seasons using dung-baited pitfall traps. Dung beetle abundance for each grazing treatment was characterized through four indices: peak abundance, species richness, Simpson's diversity index, and Simpson's evenness. A total of 4,192 dung beetles were collected through both years of trapping in this study. Peak abundance and species richness were greater in grazed treatments when compared to NG in both years. Peak abundance in the HSR was 200% (2014) and 120% (2015) higher than in the LSR. Species richness in the HSR was 70% (2014) and 61% (2015) higher than in the LSR, and 89% (2014) and 133% (2015) higher than in CONT. Simpson's diversity index was lower in the NG and CONT treatments when compared to the LSR or HSR treatments for both years. We conclude that rotational grazing, regardless of stocking density, promoted dung beetle abundance and diversity within the Nebraska Sandhills Ecoregion.

中文翻译：

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受内布拉斯加州沙丘生态系统放牧管理影响的蜣螂（鞘翅目：金龟子科）的丰度和多样性

蜣螂（鞘翅目：Scarabaeoidea）在调节牧场生态系统服务方面发挥着重要作用。然而，放牧管理对粪甲虫群落的影响在很大程度上仍然未知。本研究的目的是调查内布拉斯加州沙丘生态区整个放牧季节蜣螂的丰度和多样性。放牧处理包括：连续放牧（CONT）、低放牧轮牧（LSR）、高放牧轮牧（HSR）和不放牧（NG）。在 2014 年和 2015 年放牧季节使用粪诱饵陷阱测量了蜣螂的丰度和多样性。每个放牧处理的蜣螂丰度通过四个指数表征：峰值丰度、物种丰富度、辛普森多样性指数和辛普森均匀度。一共4个，在这项研究中，通过两年的诱捕收集了 192 只蜣螂。与 NG 相比，放牧处理的峰值丰度和物种丰富度更高。HSR 的峰值丰度比 LSR 高 200%（2014 年）和 120%（2015 年）。高铁的物种丰富度比 LSR 高 70% (2014) 和 61% (2015)，比 CONT 高 89% (2014) 和 133% (2015)。与 LSR 或 HSR 处理相比，NG 和 CONT 处理的辛普森多样性指数在这两年中都较低。我们得出的结论是，无论放养密度如何，轮牧都促进了内布拉斯加州沙丘生态区内蜣螂的丰度和多样性。HSR 的峰值丰度比 LSR 高 200%（2014 年）和 120%（2015 年）。高铁的物种丰富度比 LSR 高 70% (2014) 和 61% (2015)，比 CONT 高 89% (2014) 和 133% (2015)。与 LSR 或 HSR 处理相比，NG 和 CONT 处理的辛普森多样性指数在这两年中都较低。我们得出的结论是，无论放养密度如何，轮牧都促进了内布拉斯加州沙丘生态区内蜣螂的丰度和多样性。HSR 的峰值丰度比 LSR 高 200%（2014 年）和 120%（2015 年）。高铁的物种丰富度比 LSR 高 70% (2014) 和 61% (2015)，比 CONT 高 89% (2014) 和 133% (2015)。与 LSR 或 HSR 处理相比，NG 和 CONT 处理的辛普森多样性指数在这两年中都较低。我们得出的结论是，无论放养密度如何，轮牧都会促进内布拉斯加州沙丘生态区内蜣螂的丰度和多样性。