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This study explores possible associations between availability of fish prey and<jats:italic>Diphyllobothrium<\/jats:italic>spp. infections in lacustrine trout populations. Trout in (i) allopatry (group T); (ii) sympatry with Arctic charr (<jats:italic>Salvelinus alpinus<\/jats:italic>) (group<jats:styled-content style=\"fixed-case\">TC<\/jats:styled-content>); and (iii) sympatry with charr and three\u2010spined stickleback (<jats:italic>Gasterosteus aculeatus<\/jats:italic>) (group<jats:styled-content style=\"fixed-case\">TCS<\/jats:styled-content>) were contrasted. Mean abundance and intensity of<jats:italic>Diphyllobothrium<\/jats:italic>spp. were higher in group<jats:styled-content style=\"fixed-case\">TCS<\/jats:styled-content>compared to groups<jats:styled-content style=\"fixed-case\">TC<\/jats:styled-content>and T. Prevalence, however, was similarly higher in groups<jats:styled-content style=\"fixed-case\">TCS<\/jats:styled-content>and<jats:styled-content style=\"fixed-case\">TC<\/jats:styled-content>compared to group T. Zero\u2010altered negative binomial modelling identified the lowest probability of infection in group T and similar probabilities of infection in groups<jats:styled-content style=\"fixed-case\">TC<\/jats:styled-content>and<jats:styled-content style=\"fixed-case\">TCS<\/jats:styled-content>, whereas the highest intensity was predicted in group<jats:styled-content style=\"fixed-case\">TCS<\/jats:styled-content>. The most infected trout were from the group co\u2010occurring with stickleback (<jats:styled-content style=\"fixed-case\">TCS<\/jats:styled-content>), possibly due to a higher availability of fish prey. In conclusion, our study demonstrates elevated<jats:italic>Diphyllobothrium<\/jats:italic>spp. infections in lacustrine trout populations where fish prey are available and suggests that highly available and easily caught stickleback prey may play a key role in the transmission of<jats:italic>Diphyllobothrium<\/jats:italic>spp. parasite larvae.<\/jats:p>","DOI":"10.1111\/jfd.12467","type":"journal-article","created":{"date-parts":[[2016,4,25]],"date-time":"2016-04-25T13:20:16Z","timestamp":1461590416000},"page":"1313-1323","source":"Crossref","is-referenced-by-count":18,"title":["Effects of fish species composition on<i>Diphyllobothrium<\/i>spp. infections in brown trout \u2013 is three\u2010spined stickleback a key species?"],"prefix":"10.1111","volume":"39","author":[{"given":"J A","family":"Kuhn","sequence":"first","affiliation":[{"name":"Department of Arctic and Marine Biology Faculty of Biosciences Fisheries and Economics UiT The Arctic University of Norway Troms\u00f8 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