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The range of hosts exploited by a parasite is determined by several factors, including host availability, infectivity and exploitability. Each of these can be the target of natural selection on both host and parasite, which will determine the local outcome of interactions, and potentially lead to coevolution. However, geographical variation in host use and specificity has rarely been investigated.Maculinea (=Phengaris ) butterflies are brood parasites ofMyrmica ants that are patchily distributed across the Palæarctic and have been studied extensively in Europe. Here, we review the published records of ant host use by the EuropeanMaculinea species, as well as providing new host ant records for more than 100 sites across Europe. This comprehensive survey demonstrates that while all but one of theMyrmica species found onMaculinea sites have been recorded as hosts, the most common is often disproportionately highly exploited. Host sharing and host switching are both relatively common, but there is evidence of specialization at many sites, which varies amongMaculinea species. We show that mostMaculinea display the features expected for coevolution to occur in a geographic mosaic, which has probably allowed these rare butterflies to persist in Europe.This article is part of the theme issue ‘The coevolutionary biology of brood parasitism: from mechanism to pattern’.

Patterns of host use by brood parasiticMaculineabutterflies across Europe