Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-05T08:29:59.022Z Has data issue: false hasContentIssue false

Apparent absence of genetic differences among species of Teladorsagia (Nematoda: Trichostrongylidae)

Published online by Cambridge University Press:  05 June 2009

R. H. Andrews
Affiliation:
Department of Microbiology and Immunology, The University of Adelaide, North Terrace, Adelaide, South Australia, 5000
I. Beveridge
Affiliation:
Department of Veterinary Science, University of Melbourne, Parkville, Victoria, 3052, Australia

Abstract

The technique of allozyme electrophoresis was applied to three species of Teladorsagia present in sheep to determine the extent of genetic variation among species. Thirty-four enzyme loci were established of which 22 were invariant and 12 were shown to be polymorphic. No fixed allelic differences were detected among the species and the level of polymorphism was within the range found commonly between populations of a single species. Therefore, the genetic data support breeding data and existing morphological evidence that T. circumcincta, T. davtiani and T. trifurcata as currently recognized do in fact belong to a single species.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1990

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

Becklund, W. W. & Walker, M. L. (1971) Nomenclature and morphology of Ostertagia trifurcata Ransom, 1907, with data on spicule lengths of five stomach worms of ruminants. Journal of Parasitology, 57, 508516.CrossRefGoogle ScholarPubMed
Cabaret, J., Morales, G. & Luffau, G. (1984) Interfécondation entre Teladorsagia trifurcata et T. circumcincta. Annales de Parasitologic Humanine et Comparée, 59, 111.CrossRefGoogle ScholarPubMed
Daskalov, P. B. (1974) On the reproductive relationships between Ostertagia circumcincta, Teladorsagia davtiani, and O. trifurcata (Nematoda: Trichostrongylidae). Izvestia Tsentraly Gelmintologo Laboratorii, Sofia 17, 5972.Google Scholar
Lancaster, M. B. & Hong, C. (1981) Polymorphism in nematodes. Systematic Parasitology, 3, 2931.CrossRefGoogle Scholar
Lancaster, M. B., Hong, C. & Michel, J. F. (1983)Polymorphism in the Trichostrongylidae. In: Concepts in Nematode Systematics, Systematics Association Special Volume No. 22, edited by Stone, A. R., Platt, H. M. and Khalil, L. F. pp. 293302. Academic Press, London and New York.Google Scholar
Lichtenfels, J. R., Pilitt, P. A. & Lancaster, M. B. (1988) Cuticular ridge patterns of seven species of Ostertagiinae (Nematoda) parasitic in domestic ruminants. Proceedings of the Helminthological Society of Washington, 55, 7785.Google Scholar
Morales, G. & Cabaret, J. (1985) Determinacion de las relaciones polimorficas entre Teladorsagia circumcincta (Stadelmann, 1894) y Teladorsagia trifurcata (Ransom, 1907) en condiciones experimentales. Memoires do Instituto Oswaldo Cruz, Rio de Janeiro, 80, 8590.CrossRefGoogle Scholar
Richardson, B. J., Baverstock, P. R. & Adams, M. (1986) Allozyme Electrophoresis: A Handbook for Animal Systematics and Population Studies. Academic Press, Sydney.Google Scholar