Seasonal trends of helminth parasites of bobwhite quail

Helminthologic examination of 120 adult and 65 juvenile bobwhites (Colinus virginianus) from Leon County, Florida, during a one-year period revealed seven common (> 30% prevalence) species including Raillietina cesticillus, R. colinia, Cheilospirura spinosa, Cyrnea colini, Heterakis bonasae, Tetrameres pattersoni, and Trichostrongylus tenuis. Less frequently found helminths included Hymenolepis sp., Rhabdometra odiosa, Mediorhynchus papillosis, Aproctella stoddardi, Dispharynx nasuta, Gongylonema ingluvicola, Strongyloides avium, and Subulura sp. Juvenile bobwhites had acquired infections of 6 of the 7 common helminths by July and all seven species by August. A shift from a predominance of immature to mature parasites was noted with increasing age of juvenile bobwhites followed both linear and non-linear (plateau effect) trends when compared to age of the host. By mid-winter total helminth burdens of juvenile birds approached levels in adults. Cheilospirura spinosa, C. colini and T. pattersoni showed marked peaks in transmission between June and September. The two cecal nematodes, H. bonasae and T. tenuis, showed seasonal shifts in relative abundance with H. bonasae predominating during the summer and T. tenuis predominating during the winter. Lesions attributable to helminths were rare and involved minimal tissue damage.