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


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.


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.


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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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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