Data from: Genetic admixture predicts parasite intensity: evidence for increased hybrid performance in Darwin’s tree finches

Katharina J. Peters, Christine Evans, J. David Aguirre & Sonia Kleindorfer
Hybridisation can increase adaptive potential when enhanced genetic diversity or novel genetic combinations confer a fitness advantage, such as in the evolution of anti-parasitic mechanisms. Island systems are especially susceptible to invasive parasites due to the lack of defence mechanisms that usually coevolve in long-standing host-parasite relationships. We test if host genetic admixture affects parasite numbers in a novel host-parasite association on the Galápagos Islands. Specifically, we compare the number of Philornis downsi in nests...
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