摘要 : In total, 26 western willets, <i>Tringa semipalmata inornata</i>, were examined for helminth parasites, including 8 spring migrating hosts from the Chihuahua Desert, Rio Grande Valley, Texas, and 18 post-breeding hosts from east c... 展开 In total, 26 western willets, <i>Tringa semipalmata inornata</i>, were examined for helminth parasites, including 8 spring migrating hosts from the Chihuahua Desert, Rio Grande Valley, Texas, and 18 post-breeding hosts from east central Montana. Sixteen species of helminth parasites were present in component communities for both spring migrants and post-breeding birds. There were 9 species of trematodes, 2 cestodes, and 5 of nematodes, with a total of 1,593 individual specimens (X=99.6, +or-SE=57.9, M=9) present in migrating willets, and 5 species of trematodes, 8 cestodes, and 3 nematodes for a total of 1,148 individual specimens (X=71.8, +or-SE=34.4, M=12) present in post-breeding hosts. Species richness in infracommunities ranged from 2 to 10 (X=5.1, +or-SE=0.95, M=5.3) for spring migrants, and from 1 to 4 (X=2.8, +or-SE=0.26, M=3) for post-breeding birds. Diversity and evenness were 0.72 and 0.23 for spring migrants and. 0.62 and 0.17 for post-breeding hosts. Trematodes were the dominant taxa in spring migrants and cestode taxa in post-breeding hosts. Helminths with marine-associated life cycles were present in larger numbers in spring migrants from the Rio Grande Valley (11 of 16 species) than in post-breeding hosts from Montana hosts (4 of 16 species). The higher number of marine species in spring migrants was probably related to their more recent association with a marine habitat. Several species of <i>Anomotaenia</i> were major contributors to the component communities in both localities. Four species of nematodes with large prevalence, i.e., <i>Schistorophus skrjabini</i>, <i>Sciadiocara umbellifera</i>, <i>Skrjabinoclava inornatae</i>, and <i>Sobolivicephalus lichtensfelsi</i>, observed in spring migrants from the Rio Grande Valley were absent from Montana hosts. There was only a 2% similarity between the Rio Grande Valley and Montana. All helminth species, except for the possibility of <i>Anomotaenia</i> spp., were generalists. A checklist of helminth parasites of the willet is included.Digital Object Identifier http://dx.doi.org/10.1645/GE-2871.1 收起