Abstract Landscape complexity can benefit natural enemy communities and the biological pest control services they provide in agricultural landscapes. Harvestmen are generalist predators consuming a large range of prey in terrestrial ecosystems including agroecosystems. However, their ecology and their role in controlling pest populations in such ecosystems remain poorly studied. In this study, we examined predator–prey interactions between the European harvestmen (Phalangium opilio L.) and several potential prey species found in a vineyard agroecosystem. We sampled 20 populations of harvestmen in vineyards selected along a gradient of proportion of semi-natural habitats and used gut-content molecular analyses to quantify interaction strength between harvestmen and the grape berry moth, the main insect pest of grape, and two alternative prey species, springtails and the grape phylloxera. We found a high proportion of harvestmen positive to each type of prey with, on average, half of the individuals collected that had consumed grape berry moths. Increasing the proportion of semi-natural habitats in the landscape enhanced the proportion of harvestmen preying upon grape berry moths. Despite a significant number of harvestmen preying on springtails and grape phylloxera, the strength of the feeding interaction between harvestmen and these alternative prey species never significantly explained predation rates of the grape berry moth. Our results indicate that conserving semi-natural habitats increases biological pest control services delivered by harvestmen in vineyard landscapes and highlight the potentially important role of harvestmen in those agricultural systems.

中文翻译：

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收割者对葡萄浆果蛾的捕食取决于景观组成

摘要 景观复杂性可以使天敌群落及其在农业景观中提供的生物害虫防治服务受益。收割者是多面手捕食者，在包括农业生态系统在内的陆地生态系统中消耗大量猎物。然而，它们的生态学及其在控制此类生态系统中害虫种群方面的作用仍然缺乏研究。在这项研究中，我们研究了欧洲收割者（Phalangium opilio L.）与葡萄园农业生态系统中发现的几种潜在猎物物种之间的捕食者-猎物相互作用。我们对沿半自然栖息地比例梯度选择的葡萄园中的 20 个收获者种群进行了采样，并使用肠道内容分子分析来量化收获者与葡萄浆果蛾（葡萄的主要害虫）之间的相互作用强度，和两个替代的猎物物种，跳虫和葡萄根瘤蚜。我们发现有很高比例的收割者对每种类型的猎物都持积极态度，平均有一半的人吃过葡萄浆果蛾。增加景观中半自然栖息地的比例增加了捕食葡萄浆果蛾的收割者的比例。尽管有大量收割者捕食跳虫和葡萄根瘤蚜，但收割者与这些替代猎物物种之间的进食相互作用强度从未显着解释葡萄浆果蛾的捕食率。