Abstract
Ladybirds face a diversity of potential predators from which their main protection is powerful alkaloid-based chemical defence. In the laboratory, adults of the European orb-web spider Araneus diadematus Clerck readily consumed the native European ladybird Coccinella septempunctata L. and non-melanics and melanics of the exotic Harmonia axyridis (Pallas). The spider was little deterred by their defensive chemistry and apparently suffered no ill effects after eating ladybirds. This is particularly notable for H. axyridis, which possesses a novel alkaloid not known from European ladybirds and to which European predators are not expected to be adapted. Examination of inhabited A. diadematus webs and experimental determination of for how long captured ladybirds remained in webs indicated that ≤2% of spiders consume a ladybird each day. Ladybirds and A. diadematus are probably complementary rather than antagonistic in controlling crop pests, with ladybirds being at greatest risk from A. diadematus predation in autumn, during migration to overwintering sites.
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