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Dryad

Infection success data from experimental pairings of cane toad hosts and lungworm parasites

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Feb 02, 2024 version files 22.90 KB

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Abstract

By imposing novel selection pressures on both participants, biological invasions can disrupt evolutionary “arms races” between hosts and parasites. A spatially replicated cross-infection experiment reveals strong divergence in the ability of lungworms (Rhabdias pseudosphaerocephala) to infect invasive cane toads (Rhinella marina) in Australia. In areas colonised for > 20 years, toads are more resistant to infection by local strains of parasites than by allopatric strains. The situation reverses at the invasion front, where super-infective parasites have evolved. Invasion-induced shifts in genetic diversity and selective pressures may explain why hosts win the arms race in long-colonised areas whereas parasites win the arms race at the invasion front.