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Aggregations of nematode parasites within Drosophila: proximate causes

Published online by Cambridge University Press:  06 April 2009

J. Jaenike
J. Jaenike
Affiliation:
Department of Biology, University of Rochester, Rochester, New York 14627, USA
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Summary

Macroparasites almost invariably exhibit overdispersed distributions of parasites/host, yet the specific causes of such aggregations remain poorly understood. The present study focused on the distribution of the parasitic nematode Howardula aoronymphium among its hosts, several species of mycophagous Drosophila. The distribution of parasites/host is close to random for cohorts of flies of a given host species emerging from single mushrooms. At the level of Howardula populations, overdispersion of parasites among hosts results primarily from variation among subgroups of hosts in their exposure to infective-stage nematodes. The sources of variation identified in this study include Drosophila host species, the site where flies bred, mushroom species within sites, and, most importantly, individual mushrooms within mushroom species at a site. For the mean intensity of parasitism observed in this study, the degree of aggregation is typical of macroparasites in general. Combinations of random distributions with different means, resulting from variation among groups in exposure to parasites, may be a common cause of the overdispersion of macroparasites among hosts.

Keywords

HowardulaDrosophilamacroparasitesecologyaggregated distributions
Type
Research Article
Information
Parasitology , Volume 108 , Issue 5 , June 1994 , pp. 569 - 577
Copyright
Copyright © Cambridge University Press 1994

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References

REFERENCES

Anderson, R. M. & Gordon, D. M. (1982). Processes influencing the distribution of parasite numbers within host populations with special emphasis on parasite-induced host mortalities. Parasitology 85, 373–98.CrossRefGoogle ScholarPubMed
Anderson, R. M. & May, R. M. (1978). Regulation and stability of host-parasite population interactions: I. Regulatory processes. Journal of Animal Ecology 47, 219–48.CrossRefGoogle Scholar
Anderson, T. J. C., Zizza, C. A., Leche, G. M., Scott, M. E. & Solomons, N. W. (1993). The distribution of intestinal helminth infections in a rural village in Guatemala. Memorios do Instituto Oswaldo Cruz 88, 53–65.CrossRefGoogle Scholar
Atkinson, W. D. & Shorrocks, B. (1981). Competition on a divided and ephemeral resource: a simulation model. Journal of Animal Ecology 50, 461–71.CrossRefGoogle Scholar
Coyne, J. A., Boussy, I. A., Prout, T., Bryant, S. H., Jones, J. S. & Moore, J. A. (1982). Long-distance migration of Drosophila. American Naturalist 119, 589–95.CrossRefGoogle Scholar
Crofton, H. D. (1971). A quantitative approach to parasitism. Parasitology 62, 179–93.CrossRefGoogle Scholar
Dobson, A. P. (1985). The population dynamics of competition between parasites. Parasitology 91, 317–47.CrossRefGoogle ScholarPubMed
Dobson, A. P. & Merenlender, A. (1991). Coevolution of macroparasites and their hosts. In Parasite-Host Associations: Coexistence or Conflict?, (ed. Toft, C. A., Aeschlimann, A. & Bolis, L.), pp. 83–101. Oxford: Oxford University Press.CrossRefGoogle Scholar
Grimaldi, D. (1985). Niche separation and competitive coexistence in mycophagous Drosophila (Diptera: Drosophilidae). Proceedings of the Entomological Society of Washington 87, 498–511.Google Scholar
Ives, A. R. (1988). Aggregation and the coexistence of competitors. Annales Zoologici Fennici 25, 75–88.Google Scholar
Jaenike, J. (1992). Mycophagous Drosophila and their nematode parasites. American Naturalist 139, 893–906.CrossRefGoogle Scholar
Jaenike, J. (1993). Rapid evolution of host specificity in a parasite nematode. Evolutionary Ecology 7, 103–8.CrossRefGoogle Scholar
Jaenike, J. & Anderson, T. J. C. (1992). Dynamics of host–parasite interactions: the Drosophila–Howardula system. Oikos 64, 533–40.CrossRefGoogle Scholar
Jaenike, J. & James, A. C. (1991). Aggregation and the coexistence of mycophagous Drosophila. Journal of Animal Ecology 60, 913–28.CrossRefGoogle Scholar
Jaenike, J. & Selander, R. K. (1979). Ecological generalism in Drosophila falleni: genetic evidence. Evolution 33, 741–8.CrossRefGoogle ScholarPubMed
Keymer, A. (1982). Density-dependent mechanisms in the regulation of intestinal helminth populations. Parasitology 84, 573–87.CrossRefGoogle ScholarPubMed
Krebs, C. J. (1988). Fortran Programs for Ecological Methodology. Vancouver: Charles J. Krebs.Google Scholar
Lacy, R. C. (1984). Predictability, toxicity, and trophic niche breadth in fungus-feeding Drosophilidae (Diptera). Ecological Entomology 9, 43–54.CrossRefGoogle Scholar
Lloyd, M. (1967). Mean crowding. Journal of Animal Ecology 36, 1–30.CrossRefGoogle Scholar
May, R. M. (1977). Togetherness among schistosomes: its effects on the dynamics of the infection. Mathematical Biosciences 35, 301–43.CrossRefGoogle Scholar
Montague, J. R. & Jaenike, J. (1985). Nematode parasitism in natural populations of mycophagous drosophilids. Ecology 66, 624–6.CrossRefGoogle Scholar
Pielou, E. C. (1997). Mathematical Ecology. New York: Wiley.Google Scholar
Powell, J. R. & Dobzhansky, T. (1976). How far do flies fly. American Scientist 64, 179–85.Google ScholarPubMed
Rosewell, J., Shorrocks, B. & Edwards, K. (1990). Competition on a divided and ephemeral resource: Testing the assumptions. I. Aggregation. Journal of Animal Ecology 59, 977–1001.CrossRefGoogle Scholar
Sas Institute Inc. (1982). SAS User's Guide: Statistics. Cary, North Carolina: SAS Institute.Google Scholar
Scott, M. E. & Lewis, J. W. (1987). Population dynamics of helminth parasites in wild and laboratory rodents. Mammal Review 17, 95–103.CrossRefGoogle Scholar
Sousa, W. P. (1990). Spatial scale and the processes structuring a guild of larval trematode parasites. In Parasites Communities: Patterns and Processes, (ed. Esch, G. W., Bush, A. O. & Aho, J. M.), pp. 41–67. New York: Chapman and Hall.CrossRefGoogle Scholar
Taylor, L. R. (1961). Aggregation, variance and the mean. Nature, London 189, 732–5.CrossRefGoogle Scholar
Welch, H. E. (1959). Taxonomy, life cycle, development, and habits of two new species of Allantonematidae (Nematoda) parasitic on drosophilid flies. Parasitology 49, 83–103.CrossRefGoogle ScholarPubMed