W. Threlfall

Publications102
h-index18
Citations1,187
Highly Influential Citations74
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Endoparasites of the Double-crested Cormorant (Phalacrocorax auritus} in Florida
TLDR
The prevalence and intensity of infection with helminths in the double-crested cormorant in Florida was determined to be the most frequently and heavily infected and carried the greatest number of species.
Helminth parasites of alcids in the northwestern North Atlantic.
TLDR
Helminths belonging to 12 genera were recovered, the common murre containing the greatest number of species, and no differences in intensity of infection in male and female birds and in chicks and adults were detected.
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The biology of Ixodes (Ceratixodes) uriae White, 1852 in Newfoundland.
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Observations on the ectoparasites of some Newfoundland passerines (Aves: Passeriformes)
TLDR
Ground-feeding passerines showed the highest prevalence, intensity, and diversity of infestation by Mallophaga, as well as the greatest degree of ...
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Studies on the helminth parasites of the American herring gull (Larus argentatus Pont.) in Newfoundland
TLDR
Four hundred and ten herring gulls obtained in Newfoundland, Canada, were examined for their helminth burden during 1966 and 1967 and the helminths found were shown to have definite site preferences in the host animal.
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HORNED LARK BREEDING BIOLOGY AT CAPE ST. MARY'S, NEWFOUNDLAND
The Homed Lark (Eremophila alpestris) occupies a variety of barren habitats in Europe, North America (Vaurie 1959, Bent 1963) and Colombia. A number of studies have been made of this species in North…
Some parasites from elasmobranchs in Newfoundland.
TLDR
A total of 18 species of parasites were recovered from the spiny dogfishes and thorny skates, namely, two species of Monogenea, five of Digenea, six of Cestoda, four of Nematoda, one of Hirudinea, and one of Copepoda.
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Metazoan arasites of fish from the Smallwood Reservoir, Labrador, Canada
TLDR
Three-hundred and thirty-two fish from the Smallwood Reservoir, Labrador, Canada, were examined for metazoan parasites, using conventional parasitological techniques, and fifteen genera of parasites were recovered, these including seven new host records.
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The helminth parasites of three species of gulls in Newfoundland.
  • W. Threlfall
  • Biology
    Canadian journal of zoology
  • 1 September 1968
TLDR
No annual or seasonal differences were noted in the parasite burden, nor was there any significant difference between the burden of chicks and adults, or males or females.
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Metazoan parasites and food of short-tailed weasels and mink in Newfoundland, Canada
TLDR
A marked change in diet, from lagomorphs and passerines to insectivores, was noted when the present (1978–1979) sample was compared with a 1956–1958 sample.
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