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Wildlife disease and conservation in Hawaii: Pathogenicity of avian malaria (Plasmodium relictum) in experimentally infected Iiwi (Vestiaria coccinea)

  • C. T. Atkinson (a1), K. L. Woods (a1), R. J. Dusek (a1), L. S. Sileo (a1) and W. M. Iko (a1)...
Abstract
SUMMARY

Native Hawaiian forest birds are facing a major extinction crisis with more than 75% of species recorded in historical times either extinct or endangered. Reasons for this catastrophe include habitat destruction, competition with non-native species, and introduction of predators and avian diseases. We tested susceptibility of Iiwi (Vestiaria coccinea), a declining native species, and Nutmeg Mannikins (Lonchura punctulata), a common non-native species, to an isolate of Plasmodium relictum from the island of Hawaii. Food consumption, weight, and parasitaemia were monitored in juvenile Iiwi that were infected by either single (low-dose) or multiple (high-dose) mosquito bites. Mortality in both groups was significantly higher than in uninfected controls, reaching 100% of high-dose birds and 90% of low-dose birds. Significant declines in food consumption and a corresponding loss of body weight occurred in malaria-infected birds. Both sex and body weight had significant effects on survival time, with males more susceptible than females and birds with low initial weights more susceptible than those with higher initial weights. Gross and microscopic lesions in malaria fatalities included massive enlargement of the spleen and liver, hyperplasia of the reticuloendothelial system with extensive deposition of malarial pigment, and overwhelming anaemia in which over 30% of the circulating erythrocytes were parasitized. Nutmeg Mannikins, by contrast, were completely refractory to infection. Our findings support previous studies documenting high susceptibility of native Hawaiian forest birds to avian malaria. This disease continues to threaten remaining high elevation populations of endangered native birds.

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J. E. Applegate (1970). Population changes in latent avian malaria infections associated with season and corticosterone treatment. Journal of Parasitology 56, 439–43.

F. L. Black (1992). Why did they die? Science 258, 1739–40.

J. H. Carothers (1986 a). The effects of retreat site quality on interference related behavior among Hawaiian honeycreepers. The Condor 88, 421–6.

L. A. Freed , S. Conant & R. C. Fleischer (1987). Evolutionary ecology and radiation of Hawaiian passerine birds. Trends in Ecology and Evolution 2, 196293.

R. D. Godfrey Jr, A. M. Fedynich & D. B. Pence (1987). Quantification of hematozoa in blood smears. Journal of Wildlife Diseases 23, 558–65.

G. M. Jeffery (1962). Survival of trophozoites of Plasmodium berghei and Plasmodium gallinaceum in glycerolized whole blood at low temperatures. Journal of Parasitology 48, 601–6.

A. B. Kamis & J. B. Ibrahim (1989). Effects of testosterone on blood leukocytes in Plasmodium berghei-infected mice. Parasitology Research 75, 611–13.

S. Mountainspring & J. M. Scott (1985). Interspecific competition among Hawaiian forest birds. Ecological Monographs 55, 219–39.

C. J. Ralph & S. G. Fancy (1995). Demography and movements of Apapane and Iiwi in Hawaii. The Condor 97, 729–42.

A. H. W. M. Schuurs & H. A. M. Verheul (1990). Effects of gender and sex steroids on the immune response. Journal of Steroid Biochemistry 35, 157–72.

J. M. Scott , C. B. Kepler , C. Van Riper III & S. I. Fefer (1988). Conservation of Hawaii's vanishing avifauna. Bioscience 38, 238–53.

C. Van Riper III, S. G. Van Riper , M. L. Goff & M. Laird (1986). The epizootiology and ecological significance of malaria in Hawaiian land birds. Ecological Monographs 56, 327–44.

R. E. Warner (1968). The role of introduced diseases in the extinction of the endemic Hawaiian avifauna. The Condor 70, 101–20.

F. Wunderlich , P. Marinovski , W. Peter , M. Benten , H.-P. Schmitt-Wrede & H. Mossmann (1991). Testosterone and other gonadal factor(s) restrict the efficacy of genes controlling resistance to Plasmodium chabaudi malaria. Parasite Immunology 13, 357–67.

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Parasitology
  • ISSN: 0031-1820
  • EISSN: 1469-8161
  • URL: /core/journals/parasitology
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