title: Mortality factors in whistling swans at Lake St. Clair, Ontario.
abstract: Post mortem examinations of 31 whistling swans (Olar columbianus) collected from the Lake St. Clair marshes in the spring of 1972 indicated that lead toxicosis and filariasis (Sarconema eurycerca) were the main causes of mortality.
mesh_terms: D000818:Animals; D001228:Aspergillosis / Q000401:mortality / Q000662:veterinary; D001715:Bird Diseases / Q000401:mortality*; D001717:Birds; D004184:Dirofilariasis / Q000401:mortality / Q000662:veterinary; D007855:Lead Poisoning / Q000401:mortality / Q000662:veterinary; D009864:Ontario