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.