Bee diversity in crop fields is influenced by remotely-sensed nesting resources in surrounding permanent grasslands
Bee diversity in crop fields is influenced by remotely-sensed nesting resources in surrounding permanent grasslands
复制标题
农田蜜蜂多样性受到周围永久草地遥感筑巢资源的影响
DOI：
10.1016/j.ecolind.2018.03.054
复制
发表时间：
2018
影响因子：
6.9
通讯作者：
E. Andrieu
中科院分区：
文献类型：
--
作者：
Romain Carrié;Maïlys Lopes;A. Ouin;E. Andrieu
景观异质性是农业生态系统生物多样性的重要驱动因素。然而，考虑到生境斑块可以为物种提供的不同资源，农业景观的功能异质性很少得到研究。在本研究中，我们探讨了永久草地提供的景观尺度的巢可用性对野生蜜蜂群落的影响。在法国西南部的43块谷物田中采集了野生蜜蜂样本，这些农田周围的永久草地比例不同。利用遥感工具，我们测量了已知会局部影响蜂巢密度的两个草地结构参数（坡度和稀疏植被比例）。研究发现，周围草地的平均坡度是影响蜜蜂群落丰富度、丰度和性状分布的最积极因素。研究还发现，周围草地的平均坡度对蜜蜂群落结构的预测能力优于永久草地的比例。地面筑巢物种、高传播能力物种和多食物种均受到周围永久草原坡地可利用性的积极影响。只有对花有特殊需求的蜂种对草地稀疏植被的比例有正响应。我们的研究结果表明，草地提供的筑巢资源的景观尺度可用性影响了农业景观中的蜜蜂群落，并有助于维持蜜蜂群落的功能多样性。利用简单的遥感工具，本研究强调了在农业景观中考虑筑巢资源对维持农田野生蜜蜂多样性的重要性。
Landscape heterogeneity is an important driver of biodiversity in agroecosystems. However, the functional heterogeneity of agricultural landscapes, taking into account the different resources that habitat patches can provide to species, has rarely been studied. In this study, we explored the effect of landscape-scale nest availability provided by permanent grasslands on wild bee communities. Wild bees were sampled in 43 cereal fields in south-western France differing in the surrounding proportion of permanent grasslands. Using remote sensing tools, we measured two parameters of grassland structure known to locally influence bee nest density (slope and proportion of sparse vegetation). We found that mean slope of surrounding grasslands was the factor that most positively influenced bee richness, abundance and trait distribution in bee communities. We also found that mean slope of surrounding grasslands had a better predictive power of bee community structure than the proportion of permanent grasslands. Ground-nesting species, species with high dispersal capacities and species with a generalist diet were positively affected by the availability of sloped ground in the surrounding permanent grasslands. Only bee species with specialized flower requirements responded positively to the proportion of sparse vegetation in grasslands. Our results suggest that landscape-scale availability of nesting resources provided by grasslands affects bee communities in agricultural landscapes and can help sustain functionally diverse bee assemblages. Using simple remote sensing tools, this study highlights the importance of considering nesting resources in agricultural landscapes to maintain wild bee diversity in farmlands.