1. The decreasing number of veteran trees in Europe threatens old‐growth habitats and the fauna they support. This includes rare taxa, such as the violet click beetle, Limoniscus violaceus (Müller, 1821).
2. Samples of wood mould were taken from all beech trees in Windsor Forest previously confirmed to have contained L. violaceus larvae, and from trees where L. violaceus had not previously been detected, the latter categorised as having high, medium or low likelihood of containing the beetle during recent surveys. Habitat characteristics were measured, and volatile profiles determined using gas‐chromatography mass‐spectrometry.
3. Water content significantly differed between tree hollows of different violet click beetle status, high‐potential habitats having higher and relatively stable water content compared with habitats with medium or low potential of beetle occupancy. Several volatile organic compounds (VOCs) were significantly associated with L. violaceus habitats. No differences in other characteristics were detected.
4. The distinction in water regime between habitats highlights that recording this quantitatively could improve habitat surveys. Several potential L. violaceus attractant VOCs were identified. These could potentially be integrated into existing monitoring strategies, such as through volatile‐baited emergence traps or volatile‐based surveying of habitats, for more efficient population monitoring of the beetle.

中文翻译：

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家是心脏腐烂的地方：紫罗兰色的甲虫，紫罗兰（Limoniscus violaceus）（Müller，1821年），栖息地属性和挥发物

1. 欧洲退伍军人树数量的减少威胁着古老的栖息地及其所支持的动物。这包括稀有的分类单元，例如紫罗兰色的甲虫，紫罗兰（Limoniscus violaceus）（Müller，1821年）。
2. 取自温莎森林中所有山毛榉树的木霉样品，这些山毛榉树先前已确认含有紫罗兰幼虫，而先前未检测到紫罗兰幼木，后者被分类为含有高，中或低可能性的树木。最近的调查中发现甲虫。测量了生境特征，并使用气相色谱质谱法测定了挥发性成分。
3. 不同紫罗兰色甲虫状态的树洞之间的含水量显着不同，与具有中等或较低甲虫占有潜力的生境相比，高潜力生境的含水量较高且相对稳定。几种挥发性有机化合物（VOC）与紫堇属植物栖息地显着相关。未检测到其他特征的差异。
4. 栖息地之间水情的区别突出表明，定量记录可以改善栖息地调查。鉴定了几种潜在的紫罗兰乳杆菌引诱剂VOC。这些可能会集成到现有的监测策略中，例如通过诱饵诱集的陷阱或对生境进行基于挥发性的调查，以更有效地监测甲虫的种群。