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Amphipods can also host many parasite species, yet few studies address the entire parasite community of a gammarid population, precluding a more dynamic understanding of the food web. We set out to identify and quantify the parasite community of<jats:italic>Gammarus lacustris<\/jats:italic>to understand the contributions of the amphipod and its parasites to the Takvatn food web. We identified seven parasite taxa: a direct life cycle gregarine,<jats:italic>Rotundula<\/jats:italic>sp., and larval stages of two digenean trematode genera, two cestodes, one nematode, and one acanthocephalan. The larval parasites use either birds or fishes as final hosts. Bird parasites predominated, with trematode<jats:italic>Plagiorchis<\/jats:italic>sp. having the highest prevalence (69%) and mean abundance (2.7). Fish parasites were also common, including trematodes<jats:italic>Crepidostomum<\/jats:italic>spp., nematode<jats:italic>Cystidicola farionis<\/jats:italic>, and cestode<jats:italic>Cyathocephalus truncatus<\/jats:italic>(prevalences 13, 6, and 3%, respectively). Five parasites depend entirely on<jats:italic>G. lacustris<\/jats:italic>to complete their life cycle. At least 11.4% of the overall parasite diversity in the lake was dependent on<jats:italic>G. lacustris<\/jats:italic>, and 16% of the helminth diversity required or used the amphipod in their life cycles. These dependencies reveal that in addition to being a key prey item in subarctic lakes,<jats:italic>G. lacustris<\/jats:italic>is also an important host for maintaining parasite diversity in such ecosystems.<\/jats:p>","DOI":"10.1002\/ece3.6869","type":"journal-article","created":{"date-parts":[[2020,10,6]],"date-time":"2020-10-06T05:26:27Z","timestamp":1601961987000},"page":"12385-12394","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["High parasite diversity in the amphipod<i>Gammarus lacustris<\/i>in a subarctic lake"],"prefix":"10.1002","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2113-3692","authenticated-orcid":false,"given":"Jenny C.","family":"Shaw","sequence":"first","affiliation":[{"name":"Marine Science Institute University of California Santa Barbara Santa Barbara CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9328-7623","authenticated-orcid":false,"given":"Eirik H.","family":"Henriksen","sequence":"additional","affiliation":[{"name":"Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8579-4687","authenticated-orcid":false,"given":"Rune","family":"Knudsen","sequence":"additional","affiliation":[{"name":"Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jesper A.","family":"Kuhn","sequence":"additional","affiliation":[{"name":"Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Armand M.","family":"Kuris","sequence":"additional","affiliation":[{"name":"Marine Science Institute University of California Santa Barbara Santa Barbara CA USA"},{"name":"Department of Ecology, Evolution and Marine Biology University of California Santa Barbara CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin D.","family":"Lafferty","sequence":"additional","affiliation":[{"name":"Marine Science Institute University of California Santa Barbara Santa Barbara CA USA"},{"name":"Western Ecological Research U.S. Geological Survey Santa Barbara CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Siwertsson","sequence":"additional","affiliation":[{"name":"Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Troms\u00f8 Norway"},{"name":"Institute of Marine Research Ecosystem Processes Research Group Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5277-3799","authenticated-orcid":false,"given":"Miroslava","family":"Sold\u00e1nov\u00e1","sequence":"additional","affiliation":[{"name":"Institute of Parasitology, Biology Centre Czech Academy of Sciences \u010cesk\u00e9 Bud\u011bjovice Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2203-8216","authenticated-orcid":false,"given":"Per\u2010Arne","family":"Amundsen","sequence":"additional","affiliation":[{"name":"Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,10,5]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0706.2003.12182.x"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2656.2008.01518.x"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00442-012-2461-2"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/lno.10951"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1017\/s0022149x00034039"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182000069341"},{"key":"e_1_2_10_8_1","first-page":"661","article-title":"Ecological observations on Metabronema truttae and Cystidicola farionis Nematoda Spiruroidea in their intermediate and definitive hosts in Afon Terrig northern Wales Unitid Kingdom","volume":"21","author":"Awachie J. 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