Beetle dataset in forest edges and closed-stand forests

We utilised 2-directional flight interception traps (FITs) to record beetle movement in the forest edge. The FITs are plastic foils of 140 cm in width and 70 cm in height and they were positioned directly at ground level by affixing them to trees. Beetles were collected in 12.5 x 15 cm plastic trays placed on the ground adjacent to FITs, containing monopropylene glycol for specimen preservation. The FITs were transparent and did not attract artificially floricolous beetles, ensuring an unbiased sampling of beetle flight activity. The samples collected from the two FITs in the edge were divided into four subsamples, categorized as either ‘edge inwards’ (beetles flying from the clearing into the forest) or ‘edge outwards’ (beetles flying from the forest towards the clearing). Each edge FIT thus yielded four distinct subsamples—two ‘edge inwards’ and two ‘edge outwards,’ corresponding to its respective sides. In contrast, the FIT placed in the closed-canopy forest was not subdivided, serving instead as a baseline reference for beetle assemblages in an undisturbed forest environment. The sampling period was conducted in 2021 and 2022 in PLA Cerová vrchovina Upland, PLA Pálava and Podyjí National Park. Additionally, in 2022 we sampled Slovenský kras National Park. This setup enabled us to compare diversity metrics and species turnover between distinct microhabitats at the forest edge.本研究采用双向飞行拦截陷阱（Flight Interception Traps, FITs），记录林缘环境中的甲虫活动动态。该陷阱由宽140厘米、高70厘米的塑料薄膜制成，通过固定于树干直接安置于地面高度。甲虫被收集于紧邻陷阱放置的12.5×15厘米塑料托盘内，托盘内盛放单丙二醇用于标本保存。该陷阱为透明材质，不会人工吸引嗜花性甲虫，确保了甲虫飞行活动采样的无偏性。林缘处两个FIT采集到的样本被分为四个子样本，分别归类为“林缘向内”（即从林中空地飞入森林的甲虫）与“林缘向外”（即从森林飞向林中空地的甲虫）两类。因此每个林缘FIT均可得到四个独立子样本：两个“林缘向内”样本与两个“林缘向外”样本，分别对应陷阱的两侧。与之相对，安置于闭冠层森林中的FIT未进行子样本划分，其采样结果作为未受干扰森林环境中甲虫群落的基线参照。本次采样于2021年至2022年间在PLA Cerová vrchovina高地、PLA帕拉瓦（Pálava）及波迪吉（Podyjí）国家公园开展。此外，我们于2022年对斯洛伐克喀斯特（Slovenský kras）国家公园进行了采样。该实验设计使得我们能够对比林缘不同微生境间的多样性指标与物种周转情况。