Preliminary assessment of cavity-nesting Hymenopterans in a low-intensity agricultural landscape in Transylvania

In this study our aim was to assess several traits of cavity-nesting Hymenopteran taxa in a low-intensity agricultural landscape in Transylvania. The study took place between May and August 2018 at eight study sites in the hilly-mountainous central part of Romania, where the majority of the landscape is used for extensive farming or forestry. During the processing of the trap-nest material, we recorded several traits regarding the nests of different cavity-nesting Hymenopteran taxa and the spider prey found inside the nests of the spider-hunting representatives of these taxa. We also evaluated the relationship between the edge density and proportion of low-intensity agricultural areas surrounding the study sites and some of these traits. The majority of nests were built by the solitary wasp genus Trypoxylon, followed by the solitary wasp taxa Dipogon and Eumeninae. Solitary bees were much less common, with Hylaeus being the most abundant genus. In the nests of Trypoxylon, we mostly f...本研究旨在评估特兰西瓦尼亚（Transylvania）低强度农业景观中筑巢于洞穴的膜翅目（Hymenoptera）类群的多项特征。本研究于2018年5—8月，在罗马尼亚中部丘陵山地的8个样地展开，该区域绝大多数土地用于粗放型农作或林业经营。在处理诱捕巢（trap-nest）样品的过程中，我们记录了不同筑巢于洞穴的膜翅目类群的巢穴特征，以及该类群中蜘蛛捕食性类群的巢穴内所发现的蜘蛛猎物相关信息。同时我们还分析了样地周边的边缘密度与低强度农业用地占比，与上述部分特征之间的关联关系。 绝大多数巢穴由独居胡蜂属（Trypoxylon）筑造，其次为独居胡蜂类群双节土蜂属（Dipogon）和蜾蠃亚科（Eumeninae）。独居蜂类则相对少见，其中狭面蜂属（Hylaeus）为最优势类群。在刺胫泥蜂属（Trypoxylon）的巢穴中，我们主要……