大黄蜂是本地和栽培植物群落不可或缺的传粉者,但是物种在全球范围内的范围和丰度正在发生重大变化。气候变化和土地覆盖变化是传粉媒介下降的关键驱动因素;然而,有限的研究已经评估了这些因素对大黄蜂组合的累积影响。这项研究通过模拟特定物种的栖息地要求,测试了大黄蜂组合(以丰富度和丰度计算)对气候和土地利用的响应。以及跨地理区域的组合级别响应。我们整合了物种丰富度,丰度,以及18种具有特定地点生物气候的大黄蜂物种的分布数据,景观构成,和景观配置数据,以评估多种环境压力因素对佛罗里达州433个农田大黄蜂组合的影响,印第安纳州,堪萨斯,肯塔基,马里兰,南卡罗来纳州,犹他州,弗吉尼亚,和西弗吉尼亚州从2018年到2020年。在评估特定物种的栖息地关联时,出现了不同的东西方分组,促使按地理区域对大黄蜂组合进行详细评估。最温暖月份的最高温度和最干旱月份的降水对玉米带/阿巴拉契亚/东北部的大黄蜂组合产生了积极影响,东南,和北部平原地区,而是对山区的负面影响。Further,农田周围的林地覆盖物被强调为支持更丰富和丰富的大黄蜂组合。总的来说,气候和土地利用相结合,推动大黄蜂聚集,但是这些过程的运作方式是特殊的,并且在空间上是不同地区的。从这些发现中,我们提出了针对特定区域的管理实践,以最好地支持农业生态系统中丰富而丰富的大黄蜂组合。这项研究的结果有助于更好地了解影响整个美国大黄蜂及其栖息地的气候和景观因素。
Bumble bees are integral pollinators of native and cultivated plant communities, but species are undergoing significant changes in range and abundance on a global scale. Climate change and land cover alteration are key drivers in pollinator declines; however, limited research has evaluated the cumulative effects of these factors on bumble bee assemblages. This study tests bumble bee assemblage (calculated as richness and abundance) responses to climate and land use by modeling species-specific habitat requirements, and assemblage-level responses across geographic regions. We integrated species richness, abundance, and distribution data for 18 bumble bee species with site-specific bioclimatic, landscape composition, and landscape configuration data to evaluate the effects of multiple environmental stressors on bumble bee assemblages throughout 433 agricultural fields in Florida, Indiana, Kansas, Kentucky, Maryland, South Carolina, Utah, Virginia, and West Virginia from 2018 to 2020. Distinct east versus west groupings emerged when evaluating species-specific habitat associations, prompting a detailed evaluation of bumble bee assemblages by geographic region. Maximum temperature of warmest month and precipitation of driest month had a positive impact on bumble bee assemblages in the Corn Belt/Appalachian/northeast, southeast, and northern plains regions, but a negative impact on the mountain region. Further, forest land cover surrounding agricultural fields was highlighted as supporting more rich and abundant bumble bee assemblages. Overall, climate and land use combine to drive bumble bee assemblages, but how those processes operate is idiosyncratic and spatially contingent across regions. From these findings, we suggested regionally specific management practices to best support rich and abundant bumble bee assemblages in agroecosystems. Results from this study contribute to a better understanding of climate and landscape factors affecting bumble bees and their habitats throughout the United States.