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We compared the prevalence and infection levels of haemogregarine blood parasites between two sympatric congeneric species in Lisbon, Portugal: the invasive Italian wall lizard (<jats:italic>Podarcis siculus<\/jats:italic>) and the native green Iberian wall lizard (<jats:italic>Podarcis virescens<\/jats:italic>). The two species had significant differences in their infection levels: while <jats:italic>P. virescens<\/jats:italic> had high prevalence of infection (69.0%), only one individual of <jats:italic>P. siculus<\/jats:italic> was infected (3.7%), and while <jats:italic>P. virescens<\/jats:italic> exhibited an average intensity of 1.36%, the infected <jats:italic>P. siculus<\/jats:italic> individual had an infection rate of only 0.04%. Genetic analyses of 18S rRNA identified two different haemogregarine haplotypes in <jats:italic>P. virescens<\/jats:italic>. Due to the low levels of infection, we were not able to amplify parasite DNA from the infected <jats:italic>P. siculus<\/jats:italic> individual, although it was morphologically similar to those found in <jats:italic>P. virescens<\/jats:italic>. Since other studies also reported low levels of parasites in <jats:italic>P. siculus<\/jats:italic>, we hypothesize that this general lack of parasites could be one of the factors contributing to its competitive advantage over native lizard species and introduction success.<\/jats:p>","DOI":"10.1007\/s00436-021-07233-5","type":"journal-article","created":{"date-parts":[[2021,7,7]],"date-time":"2021-07-07T11:02:52Z","timestamp":1625655772000},"page":"2953-2957","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Invasive lizard has fewer parasites than native congener"],"prefix":"10.1007","volume":"120","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3649-2759","authenticated-orcid":false,"given":"Beatriz","family":"Tom\u00e9","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5144-2421","authenticated-orcid":false,"given":"D. James","family":"Harris","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7466-4753","authenticated-orcid":false,"given":"Ana","family":"Perera","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4630-3202","authenticated-orcid":false,"given":"Isabel","family":"Damas-Moreira","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,7,7]]},"reference":[{"key":"7233_CR1","volume-title":"Field guide to the reptiles and amphibians of Britain and Europe","author":"EN Arnold","year":"2002","unstructured":"Arnold EN, Burton JA (2002) Field guide to the reptiles and amphibians of Britain and Europe. 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