Helminth fauna of Falconiform and Strigiform birds of prey in Galicia, Northwest Spain.

This is a survey of the helminth fauna of 285 individuals of 14 species of birds of prey (Falconiformes and Strigiformes) from Galicia (northwest Spain), namely Buteo buteo, Accipiter nisus, A. gentilis, Milvus migrans, M. milvus, Pernis apivorus, Circus pygargus, Falco tinnunculus, F. peregrinus, F. subbuteo, Tyto alba, Strix aluco, Asio otus and Athene noctua. A total of 15 helminth species were detected, namely 8 nematodes ( Eucoleus dispar, Capillaria tenuissima, Synhimantus laticeps, Microtetrameres sp., Physaloptera alata, Procyrnea leptoptera, Hovorkonema variegatum and Porrocaecum angusticolle), 4 cestodes ( Cladotaenia globifera, Paruterina candelabraria and Mesocestoides sp.), 2 trematodes ( Neodiplostomum attenuatum and Strigea falconis), and 1 acanthocephalan ( Centrorhynchus globocaudatus). The helminth communities observed were basically similar, although there were marked differences in species richness, which was higher in falconiforms (except for A. gentilis) than in strigiforms. More specifically, species richness was highest in B. buteo (13 species), followed by A. nisus (11 species). In the falconiforms, the helminth species present generally exhibited a clear relationship with host diet. In the strigiforms, by contrast, species richness was lower than expected given the host's diet, suggesting that a different explanation is needed.