Protozoans

  • G. F. Bennett
  • E. C. Greiner
  • W. Threlfall

Abstract

Certain groups of protozoan parasites, particularly haemosporidans, flagellates and coccidians, have been widely incriminated as controlling agents of wildlife populations, but this paper shall consider only their impact on avifauna. While it is generally believed that protozoans do act as limiting factors on avian populations, it is suggested that these conclusions, for the most part, are based on the impact of such diseases on populations which are not native to the region involved. It is further suggested that there are insufficient data to determine whether protozoan diseases do indeed have any substantial impact on natural populations. While it is entirely possible that such diseases may exert a controlling or limiting influence on bird populations, the lack of necessary baseline data precludes definitive conclusion. It is suggested therefore that before such questions can be answered, baseline data on such aspects as reproductive rates, survival rates, influence of climatic factors and non-protozoan diseases, etc., must be ascertained for each population in each area under study.

Keywords

Wild Bird Bird Population Blood Parasite Black Grouse Avian Malaria 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Gewisse Gruppen parasitischer Protozoen, besonders die Haemosporiden, Flagellaten and Coccidien wurden vielfach als regulierende Faktoren bestimmter Tier Bevölkerungen angesehen, aber dieser Artikel handelt nur von ihrer Wirkung auf die Vogelwelt. Es wird allgemein angenommen, dass die Protozoen als einschränkende Faktoren auf Vogel Bevölkerungen wirken, aber wir möchten vorschlagen, dass die meisten dieser Schlussfolgerungen sich auf die Wirkung dieser Krankheiten auf Bevölkerungen basieren, die nicht einheimisch in der betreffenden Region sind. Weiterhin finden wir, dass die Ergebnisse unzureichend sind um mit Bestimmtheit zu sagen ob die Krankheiten, die von Protozoen verursacht werden, wirklich einen wichtigen Einfluss auf natürliche Tier Bevölkerungen haben. Während es unbedignt möglich ist, dass solche Krankheiten einen regulierenden oder begrenzenden Einfluss auf Vogel Bevölkerungen ausüben, schliesst das Fehlen der grundlegenden Kenntnisse, eine präzise Endfolgerung aus. Ehe diese Fragen beantwortet werden können, muss man sich vergewissern über die elementaren Kenntnisse der Vermehrungsrate, der überlebungsrate, den Einfluss des Klimas und anderer, nicht von Protozoen verursachten Krankheiten, für jede einzelne Bevölkerung in jeder Region, die erforscht wird.

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Literature Cited

  1. 1.
    Borg, K. 1953. On Leueoeytozoon in Swedish capercaille, black grouse and hazel grouse. Commun. State Vet. Med. Inst. Stockholm, Sweden. 109 pp.Google Scholar
  2. 2.
    Clarke, C. H. D. 1936. Fluctuations in numbers of ruffed grouse, Bonasa umbellus (L.), with special reference to Ontario.Univ. Toronto Studies, Biol. Ser. 44: 82–85, 88–89. 118 pp.Google Scholar
  3. 3.
    Desser, S. S. 1973. Comparisons of life cycles and pathogenesis in the Haemosporidia. 9th Internat. Cong. on Trop. Med. & Malaria, Athens, Greece, Oct. 14–21, 1973. Vol. 1: 243–244. Abstract #353.Google Scholar
  4. 4.
    Fallis, A. M. and G. F. Bennett. 1958. Transmission of Leucocytozoon bonasae Clarke to ruffed grouse (Bonasa umbellus L.) by the black flies Simulium Zatipes Mg. and Simulium aureum Fries. Can. J. Zool. 36: 533–539.CrossRefGoogle Scholar
  5. 5.
    Garnham, P. C. C. 1950. Blood parasites of East African vertebrates with a brief description of exo-erythrocytic schizogony in Plasmodium pitmani. Parasitology 40: 328–337.PubMedCrossRefGoogle Scholar
  6. 6.
    Greiner, E. C. 1972. Parasites of Nebraska pheasants. J. Wildl. Dis. 8: 203–206.PubMedGoogle Scholar
  7. 7.
    Greiner, E. C. and W. L. Baxter. 1974. A localized epizootic of trichomoniasis in mourning doves. J. Wildl. Dis. 10: 104–106.PubMedGoogle Scholar
  8. 8.
    Haugen, A. O. 1952. Trichomoniasis in Alabama mourning doves. J. Wildl. Mgmt. 15: 164–169.Google Scholar
  9. 9.
    Haugen, A. O. and J. Keeler. 1952. Mortality of mourning doves from trichomoniasis in Alabama during 1951. 17th N. Amer. Wildl. Conf. pg. 141–151.Google Scholar
  10. 10.
    Herman, C. M., J. H. Barrow and I. B. Tarshis. 1975. Leucocytozoonosis in Canada geese at the Seney National Wildlife Refuge. J. Wildl. Dis. 11: 404–411.PubMedGoogle Scholar
  11. 11.
    Herman, C. M., H. A. Jankiewicz and R. W. Saarni. 1942. Coccidiosis in California quail. Condor 44: 168–171.CrossRefGoogle Scholar
  12. 12.
    Kocan, R. M. and C. M. Herman. 1971. Trichomoniasis. Pages 282–290 in J. W. David, R. C. Anderson, L. Karstad and D. O. Trainer, eds. Infectious and Parasitic Diseases of Wild Birds. Iowa State University Press, Ames, Iowa.Google Scholar
  13. 13.
    Leslie, A. S. and A. E. Shipley. 1912. The grouse in health and in disease. Smith, Elder & Co. London. 468 pp.Google Scholar
  14. 14.
    Lund, E. E. 1969. Histomoniasis. Adv. Vet. Sci. & Comp. Med. 13: 355–390.Google Scholar
  15. 15.
    Markus, M. B. 1974. Arthropod-borne disease as a possible factor limiting the distribution of birds. Internat. J. for Parasitol. 4: 609–612.CrossRefGoogle Scholar
  16. 16.
    Markus, M. B. and J. H. Oosthuizen. 1972. The haematozoa of South African birds. VI. Avian malaria. Vet. Rec. 91: 198–199.PubMedCrossRefGoogle Scholar
  17. 17.
    Reid, W. M. 1967. Etiology and dissemination of the blackhead disease syndrome in turkeys and chickens. Experimental Parasitol. 21: 249–275.CrossRefGoogle Scholar
  18. 18.
    Sneed, K. and G. Jones. 1950. A preliminary study of coccidiosis in Oklahoma quail. J. Wildl. Mgmt. 14: 169–174.CrossRefGoogle Scholar
  19. 19.
    Sowls, L. K. 1969. Cooperative Wildlife Research Unit. Arizona Wildl. Views 16: 11.Google Scholar
  20. 20.
    Stabler, R. M. 1954. Trichomonas gallinae: A review. Experimental Parasitol. 3: 368–402.Google Scholar
  21. 21.
    Stabler, R.M. and C. M. Herman. 1951. Upper digestive tract trichomoniasis in mourning doves and other birds. Trans. 16th N. Amer. Wildl. Conf. pp. 145–163.Google Scholar
  22. 22.
    Stoddard, H. L. 1931. The bobwhite quail. Its habits, preservation and increase. Charles Scribner’s Sons, New York. XXIX +559 pp., 69 pl., 32 fig.Google Scholar
  23. 23.
    Stone, W. B., B. L. Weber and F. J. Parks. 1971. Morbidity and mortality of birds due to avian malaria. N.Y. Fish and Game Jour. 18: 62–63.Google Scholar
  24. 24.
    Todd, K. S. and D. M. Hammond. 1971. Coccidia of anseriformes, galliformes and passeriformes. Pages 234–281 in J. W. Davis, R. C. Anderson, L. Karstad and D. O. Trainer, eds. Infectious and Parasitic Diseases of Wild Birds. Iowa State University Press, Ames, Iowa.Google Scholar
  25. 25.
    Warner, R. E. 1968. The role of introduced diseases in the extinction of the endemic Hawaiian avifauna. The Condor 70: 101–120.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1976

Authors and Affiliations

  • G. F. Bennett
    • 1
  • E. C. Greiner
    • 1
  • W. Threlfall
    • 1
  1. 1.Department of Biology and International Reference, Centre for Avian Malaria ParasitesMemorial University of NewfoundlandSt. John’sCanada

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