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Dynamics of the Intestinal Helminth Fauna in Three Species of Ducks
Henry N. Buscher
The Journal of Wildlife Management
Vol. 29, No. 4 (Oct., 1965), pp. 772-781
Stable URL: http://www.jstor.org/stable/3798553
Page Count: 10
You can always find the topics here!Topics: Ducks, Infections, Fauna, Intermediate hosts, Waterfowl, Juveniles, Parasite hosts, Invertebrates, Breeding, Nematodes
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The dynamics of the intestinal helminth fauna of some anatids along a North American migratory route and the factors contributing to it were studied. The alimentary tracts from 500 ducks of three species, the pintail (Anas acuta), the gadwall (Anas strepera), and the shoveler (Spatula clypeata), were collected during the months of June, 1963, through August, 1964. Twenty-seven species of helminths including 6 genera and 17 species of Cestoidea, 6 genera and 7 species of Digenea, 2 species of Nematoda in as many genera, and 1 species of Acanthocephala were found. Helminth species and the degree of their infection varied greatly in different hosts in the same area, in young and adult ducks of the same species, and in ducks during different seasons. The greatest invasion of helminths occurred in young ducks at the breeding area. The intensity of helminth infections decreased greatly during the fall migration; in addition, several species of helminths were lost entirely. Factors influencing the composition and distribution of the helminth fauna include physiological changes in the host corresponding with seasonal migration, age of the host, feeding habits of the host resulting directly from a change in climatic conditions and available food, and the complexity and duration of the parasites' life cycles.
The Journal of Wildlife Management © 1965 Wiley