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We identified a total of 647,174 individual helminths from 40 taxa, including 20 trematodes, 14 cestodes, 4 nematodes and 2 acanthocephalans parasitizing lesser scaup within the study area. Lesser scaup were each infected with 2\u201323 helminth taxa. One digenean,<jats:italic>Plenosoma minimum<\/jats:italic>, is reported for the first time in lesser scaup and in the Midwest. Mean trematode abundance and total helminth abundance was significantly less in 2015 than 2014, and we suspect that colder weather late in 2015 impacted the intermediate host fauna and caused the observed differences. Brillouin's species diversity of helminths was greatest in the northernmost region of the study area, which coincides with the range of a non-indigenous snail that indirectly causes annual mortality events of lesser scaup. While host age and size were not determined to be influential factors of helminth infracommunity structure, non-parametric ordination and permutational analysis of co-variance revealed that year and region of collection explained differences in helminth infracommunities. Our results suggest that spatiotemporal variations play an important role in the structure of intestinal helminth infracommunities found in migrating lesser scaup hosts, and may therefore impact host ability to build endogenous reserves at certain stopover locations in the Midwest.<\/jats:p>","DOI":"10.1017\/s0022149x16000493","type":"journal-article","created":{"date-parts":[[2016,7,27]],"date-time":"2016-07-27T10:14:10Z","timestamp":1469614450000},"page":"479-490","source":"Crossref","is-referenced-by-count":4,"title":["Spatiotemporal distributions of intestinal helminths in female lesser scaup<i>Aythya affinis<\/i>during spring migration from the upper Midwest, USA"],"prefix":"10.1017","volume":"91","author":[{"given":"J.C.","family":"England","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.M.","family":"Levengood","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.M.","family":"Osborn","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A.P.","family":"Yetter","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.M.","family":"Kinsella","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R.A.","family":"Cole","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C.D.","family":"Suski","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"H.M.","family":"Hagy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2016,7,27]]},"reference":[{"key":"S0022149X16000493_ref46","doi-asserted-by":"publisher","DOI":"10.1002\/sim.1320"},{"key":"S0022149X16000493_ref55","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijpara.2012.05.008"},{"key":"S0022149X16000493_ref9","doi-asserted-by":"publisher","DOI":"10.1007\/s00442-006-0551-8"},{"key":"S0022149X16000493_ref23","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2005.3070"},{"key":"S0022149X16000493_ref27","doi-asserted-by":"publisher","DOI":"10.1093\/acprof:oso\/9780198529873.003.0006"},{"year":"2005","author":"Reiczigel","key":"S0022149X16000493_ref47"},{"volume-title":"Handbook 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