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Coexisting pathogens can also facilitate the establishment of non\u2010native species by detrimentally impacting on the native fauna acting as novel weapons. The signal crayfish (<jats:italic>Pacifastacus leniusculus<\/jats:italic>) is a highly invasive species, which has caused mass declines of native crayfish in Europe through displacement and transmission of the oomycete<jats:italic>Aphanomyces astaci<\/jats:italic>(crayfish plague), which is typically lethal to native European crayfish. However, whether<jats:italic>Aphanomyces astaci<\/jats:italic>may have facilitated the invasion of the signal crayfish is not known. We estimated the genetic diversity at microsatellite<jats:styled-content style=\"fixed-case\">DNA<\/jats:styled-content>loci, effective population size, and potential origins of seven infected and noninfected signal crayfish populations in Europe and one founder population in North America. Approximate Bayesian computation analysis and population structuring suggested multiple host introductions from diverse source populations, as well as higher heterozygosity among infected than uninfected populations, which could reflect a fitness advantage. Low effective population size, moderate heterozygosity, and lack of isolation by distance suggest that some invasive signal crayfish populations may not be fully established or that their genetic diversity may have been reduced by eradication attempts.<\/jats:p>","DOI":"10.1002\/ece3.4235","type":"journal-article","created":{"date-parts":[[2018,7,30]],"date-time":"2018-07-30T12:55:32Z","timestamp":1532955332000},"page":"9181-9191","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Genetic diversity and parasite facilitated establishment of the invasive signal crayfish (<i>Pacifastacus leniusculus<\/i>) in Great Britain"],"prefix":"10.1002","volume":"8","author":[{"given":"Chloe Victoria","family":"Robinson","sequence":"first","affiliation":[{"name":"Swansea University Swansea Wales UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos","family":"Garcia de Leaniz","sequence":"additional","affiliation":[{"name":"Swansea University Swansea Wales UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joanna","family":"James","sequence":"additional","affiliation":[{"name":"Cardiff University Cardiff Wales UK"},{"name":"Environment Agency Brampton UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joanne","family":"Cable","sequence":"additional","affiliation":[{"name":"Cardiff University Cardiff Wales UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pablo","family":"Orozco\u2010terWengel","sequence":"additional","affiliation":[{"name":"Cardiff University Cardiff Wales UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4403-2509","authenticated-orcid":false,"given":"Sofia","family":"Consuegra","sequence":"additional","affiliation":[{"name":"Swansea University Swansea Wales UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2018,7,30]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1523-1739.2007.00696.x"},{"key":"e_1_2_9_3_1","unstructured":"Alderman D. 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