Helminths from some Minnesota and Wisconsin raptors

Abstract

Seventy-seven hawks of 10 species (Accipiter cooperii, Accipiter striatus, Accipiter gentilis, Circus cyaneus, Buteo lagopus, Buteo jarnaicensis, Buteo platypterus, Pandion haliaetus, Falco peregrinus, Falco sparverius) and 49 owls of 8 species (Bubo virginianus, Strix nebulosa, Strix varia, Aegolius acadicus, Otus asio, Asio flammeus, Asio otus, Cryptoglaux funereus) from Minnesota and Wisconsin were examined for helminths. Echinoparyphium sp., Echinostoma trivolvis, Neodiplostomurn sp., Ribeiroia thomasi, Strigea falconis (Trematoda), Capillaria sp., Cyrnae sp., and Porrocaecurn sp. (Nematoda) were common to both hawks and owls. Paruterina sp. (Cestoda) was found only in the great-horned owl. Lyperosomum sp., Parastrigea sp. (Trematoda), Centrorhynchus spinosus (Acanthocephala), Contracaecum pandioni, Microtetrameres sp., Physaloptera sp., Serratospiculoides amaculata, and Tetrameres sp. (Nematoda) were recovered from hawks. New host records include Lyperosomum sp. from the gall bladder of a kestrel and Ribeiroia thomasi from the proventriculi of great-horned owls and red-tailed and broad-winged hawks. The only instance of pathology was a tissue reaction to S. amaculata in the air sacs of a Cooper's hawk.