Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-19T11:41:06.826Z Has data issue: false hasContentIssue false
  • English
  • Français

Changes in the hatch rate of Haemonchus contortus eggs between geographic regions

Published online by Cambridge University Press:  06 April 2009

L. F. Le Jambre  and
J. H. Whitlock
L. F. Le Jambre
Affiliation:
New York State College of Veterinary Medicine, Cornell University, Ithaca, N.Y. 14853, U.S.A.
J. H. Whitlock
Affiliation:
New York State College of Veterinary Medicine, Cornell University, Ithaca, N.Y. 14853, U.S.A.
Get access Rights & Permissions [Opens in a new window]

Extract

Vulvar phenotypes and the rate of development of eggs over a range of temperatures were used to compare Haemonchus contortus populations in New York State and Ohio. These parameters indicated that the westernmost boundary of the subspecies Haemonchus contortus cayugensis is the Chautauqua valley in New York. The Haemonchus ecotype in Ohio had a vulvar phenotype formula similar to that described for the subspecies Haemonchus contortus contortus. The relationship between slope and intercept of the regression of rate of egg hatch on temperature was different for morphs within ecotypes as well as between the New York and Ohio ecotypes. Linguiform-A appeared to be the cold-adapted morph in both ecotypes. Smooth was the warm-adapted morph in New York with linguiform-B filling that niche in Ohio.

Type
Research Article
Information
Parasitology , Volume 73 , Issue 2 , October 1976 , pp. 223 - 238
Copyright
Copyright © Cambridge University Press 1976

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bliss, C. I. (1970). Statistics in Biology, vol. 2. New York: McGraw Hill.Google Scholar
Conway, D. L. & Whitlock, J. H. (1965). A study of the variables influencing artificial infections with Haemonchua contortus. Cornell Veterinarian 55, 251–8.Google Scholar
Crofton, H. D. (1957). Nematode parasitic populations in sheep on lowland farms. III. The seasonal incidence of species. Parasitology 47, 304–18.Google Scholar
Crofton, H. D. (1965). Ecology and biological plasticity of sheep nematodes. I. The effect of temperature on the hatching of eggs of some nematode parasites of sheep. Cornell Veterinarian 55, 242–51.Google Scholar
Crofton, H. D. & Whttlock, J. H. (1965). Ecology and biological plasticity of sheep nematodes. IV. The biological significance of temperature x time hatching curves for eggs of sheep nematodes. Cornell Veterinarian 55, 263–74.Google Scholar
Crofton, H. D. & Whitlock, J. H. (1965). Ecology and biological plasticity of sheep nematodes. V. The relationship between egg volume and hatching time. Cornell Veterinarian 55, 275–9.Google Scholar
Crofton, H. D, Whitlock, J. H. & Glazer, R. A. (1965). Ecology and biological plasticity of sheep nematodes. II. Genetic x environmental plasticity in Haemonchus contortus (Rudolphi 1803). Cornell Veterinarian 55, 251–8.Google Scholar
Das, K. M. & Whitlock, J. H. (1960). Subspeciation in Haemonchus contortus (Rudolphi, 1803), Nema. Trichostrongyloidea. Cornell Veterinarian 50, 182–97.Google Scholar
Daskalov, P. B. (1971). Haemonchus contortus: Genetically determined polymorphism in females. Experimental Parasitology, 29, 351–36.CrossRefGoogle ScholarPubMed
Le Jambre, L. F(1976). Genetics of vulvar morph types in Haemonchus contortw,. I. Haemonchus contortus cayugensis from the Finger Lakes Region of New York. (In preparation.)Google Scholar
Le Jambre, L. F. & Royal, W. M. (1976). Genetics of vulvar morph types in Haemonchus contortus. II. Haemonchus contortus from the Northern Tablelands of New South Wales. (In preparation.)Google Scholar
Le Jambre, L. F. & Whitlock, J. H. (1973). Optimum temperature for egg development of phenotypes in Haemonchus contortus cayugensis as determined by Arrhenius diagrams and Sacher's entropy function. International Journal for Parasitology 3, 299–310.Google Scholar
Le Jambre, L. F, Ractltffe, L. H, Whitlock, J. H. & Crofton, H. D. (1970). Polymorphism and egg-size in the sheep nematode, Haemonchus contortus. Evolution 24, 625–31.CrossRefGoogle ScholarPubMed
Mayr, E. (1966). Animal Species and Evolution. Cambridge, Mass.: Harvard University Press.Google Scholar
McKenna, P. B. (1971). Morphological evidence of subspeciation in Haemonchus contortus from New Zealand sheep: The vulvar flap formula. New Zealand Journal of Agricultural Research 14, 902–14.CrossRefGoogle Scholar
Roberts, F. H. S., Turner, H. N. & McKevett, M. (1954). On the specific distinctness of the ovine and bovine ‘strains’ of Haemonchus contortus (Rudolphi) Cobb (Nematoda: Trichostrongylidea). Australian Journal of Zoology 2, 275–95.Google Scholar
Rose, J. H. (1966). The vulval flap formula of Haemonchus contortus from sheep in south-east England. Research in Veterinary Science 7, 480–3.Google Scholar
Tod, M. E. (1965). On the morphology of Haemonchus contortus (Rudolphi) Cobb (Nematoda: Trichostrongylidae) in sheep and cattle. Australian Journal of Zoology 13, 773–81.Google Scholar
Whitlock, J. H. (1963). A cybernetic approach to a natural epidemic of strongylatosis in sheep. Cornell Veterinarian 53, 505–34.Google Scholar
Whitlock, J. H, Georgi, J., Robson, D. S. & Federer, W. T. (1966). Haemonchosis: An orderly disease. Cornell Veterinarian 56, 544–54.Google ScholarPubMed