Hematozoa of waterfowl from Michigan

Two hundred eighteen and 127 wild waterfowl (Anatidae) of five species were sampled from the Kellogg Biological Station area (Michigan, USA) during th e summer (1 June to 24 August 1995) and fall (9 September to 8 October 1995 ), respectively Twelve (6%) of those sampled in summer and 13 (11%) sampled in the fall were infected with hemosporids. Haemoproteus nettionis, Haemop roteus greineri, and Leucocytozoon simondi infected both summer and fall bi rds, with H. nettionis the most common (4% summer; 7% fall). Mean intensiti es were low; the highest mean intensity was 4.6 +/- 1.1 gametocytes per 5,0 00 uninfected erythrocytes for H. nettionis in summer. Of 123 local waterfo wl, none were infected with any blood parasite. Thirty-five captive year-ro und resident waterfowl also were sampled and no blood parasites were found.