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The North American signal crayfish (<jats:italic>Pacifastacus leniusculus<\/jats:italic>) is a known carrier of<jats:italic>Aphanomyces astaci<\/jats:italic>, an oomycete pathogen that is the causative agent of crayfish plague and fatal to European crayfish species, whereas North American species are considered to be largely resistant. There is some evidence, however, that North American species, can also succumb to crayfish plague, though how<jats:italic>A. astaci<\/jats:italic>affects such \u2018reservoir hosts\u2019 is rarely considered. Here, we tested the impact of<jats:italic>A. astaci<\/jats:italic>infection on signal crayfish, by assessing juvenile survival and adult behaviour following exposure to<jats:italic>A. astaci<\/jats:italic>zoospores. Juvenile signal crayfish suffered high mortality 4-weeks post-hatching, but not as older juveniles. Furthermore, adult signal crayfish with high-infection levels displayed altered behaviours, being less likely to leave the water, explore terrestrial areas and exhibit escape responses. Overall, we reveal that<jats:italic>A. astaci<\/jats:italic>infection affects signal crayfish to a much greater extent than previously considered, which may not only have direct consequences for invasions, but could substantially affect commercially harvested signal crayfish stocks worldwide.<\/jats:p>","DOI":"10.1017\/s0031182020000165","type":"journal-article","created":{"date-parts":[[2020,2,12]],"date-time":"2020-02-12T08:42:25Z","timestamp":1581496945000},"page":"706-714","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":15,"title":["Crayfish plague affects juvenile survival and adult behaviour of invasive signal crayfish"],"prefix":"10.1017","volume":"147","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7724-014X","authenticated-orcid":false,"given":"John Rhidian","family":"Thomas","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chloe 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