Since its arrival in 2004, the non-native Harlequin ladybird Harmonia axyridis (Coleoptera: Coccinellidae) has rapidly spread throughout Britain, and it is now the most common coccinellid in England. There have since been concerns about the detrimental effects it may have on native coccinellids because there is a strong correlation between the arrival of H. axyridis and the decline in native species, including the two-spot ladybird, Adalia bipunctata. However, there have been few studies of the behavioural interactions between these two species, which occupy a high-niche overlap. This study investigated if the presence of H. axyridis impacts the feeding behaviour of A. bipunctata through direct competition for aphid prey. Foraging and interactive behaviour of A. bipunctata and H. axyridis were investigated within microcosms. Adalia bipuncata exhibited a similar consumption rate and time in the presence of H. axridis, yet H. axyridis consumed 3.5 times more prey items and were seven times faster compared to A. bipuncata. Observations showed that H. axyridis does not directly disrupt the feeding behaviour of A. bipunctata, but rather indirectly excludes the native species through being a superior competitor for prey items. Results indicate that the decline in native coccinellid species may be a consequence of H. axyridis competitive advantage, but that the concept of coexistence should not be dismissed.

中文翻译：

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非本地丑角瓢虫是否会干扰本地两点瓢虫的进食行为？


自 2004 年到来以来，非本土丑角瓢虫异色瓢虫（鞘翅目：瓢虫科）已迅速传播到整个英国，现在是英国最常见的瓢虫科。此后，人们一直担心它可能对本地瓢虫产生有害影响，因为它们的到来之间存在很强的相关性。异色异色线虫以及本地物种的减少，包括两点瓢虫，二点阿达利亚。然而，对这两个物种之间的行为相互作用的研究很少，它们占据了高度的利基重叠。这项研究调查了是否存在异色异色线虫影响摄食行为双点毛苋通过直接竞争蚜虫猎物。觅食和互动行为双点毛苋和异色异色线虫在微观世界中进行了研究。双点阿达利亚在存在的情况下表现出相似的消耗率和时间异色哈氏线虫， 然而异色异色线虫与相比，消耗的猎物数量多 3.5 倍，速度快 7 倍双点毛苋。观察表明异色异色线虫不直接扰乱进食行为双点毛苋，而是通过成为猎物的优越竞争者来间接排除本地物种。结果表明，本地瓢虫种类的减少可能是由于异色异色线虫竞争优势，但共存的概念不应被忽视。