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The impact of ticks on Bufo marinus from native habitats

Published online by Cambridge University Press:  06 April 2009

M. Lampo  and
P. Bayliss
M. Lampo
Affiliation:
Centra de Ecología, IVIC, Apartado 21827, Caracas-1020-A, Venezuela
P. Bayliss
Affiliation:
Departamento Ecología, INPA, Alameda, Cosme Ferreira 1756, Aleixo 69083, Manaus AM, Brazil
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Summary

We analysed the patterns of tick distribution on 2274 adult toads from Venezuela and Brazil, to explore whether these ectoparasites have any impact on the survival of Bufo marinus. A maximum-likelihood analysis showed that aggregation levels of ticks decreased significantly with the mean intensity of infection. This decline could be attributed to a density-dependent reduction of ticks within toads, density-dependent tick-induced toad mortality and/or density-dependent tick-induced changes in toad susceptibility. However, the relationship between the rate of change in tick loads and tick burdens from recaptured toads indicated that neither the loss of ticks within toads nor the toad susceptibility to further infection were dependent upon tick burdens. Therefore, we can indirectly infer that density-dependent tick-induced toad mortality is responsible for the observed decline in aggregation levels with tick age and burdens. On the other hand, a significant negative relationship between tick burdens and the size-specific weight of toads suggested that ticks may also have a significant impact on the patterns of weight deposition of adult toads. This evidence suggests that these ectoparasites may play an important role in regulating the densities of B. marinus in native habitats.

Keywords

Bufo marinusAmblyomma sppamphibiaparasite distributiondensity-dependenceparasite impact
Type
Research Article
Information
Parasitology , Volume 113 , Issue 2 , August 1996 , pp. 199 - 206
Copyright
Copyright © Cambridge University Press 1996

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References

REFERENCES

Adis, J. (1981). Observações ecoentomológicas na Amazônia. Acta Amazonica 11, 407.CrossRefGoogle Scholar
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, 373–398.CrossRefGoogle ScholarPubMed
Anderson, R. M. & May, R. M. (1991). Infectious Diseases of Humans: Dynamics and Control. Oxford University Press Inc: Oxford.CrossRefGoogle Scholar
Argão, H. B. (1936). Ixodidas brasileiros e de alguns países limitrofes. 3 Memorias do Institute Oswaldo Cruz 13, 759–843.CrossRefGoogle Scholar
Bayliss, P. (1994). The ecology of post-metamorphic Bufo marinus in Central Amazonian Savanna, Brazil. Ph. D. Dissertation. University of Queensland, Australia.Google Scholar
Bull, M. C. & Burzacott, D. (1993). The impact of tick load on the fitness of their lizard hosts. Oecologia 96, 415–419.Google Scholar
Chilton, N. B., Bull, C. M. & Andrews, R. H. (1992). Differences in attachment site of the Australian tick Amblyomma limbatum (Acari: Ixodidae) on two host species. International Journal for Parasitology 22, 783–787.CrossRefGoogle Scholar
Dobson, A. P. (1988). Restoring island ecosystems: the potential of parasites to control introduced mammals. Conservation Ecology 2, 31–39.Google Scholar
Dobson, A. P. & May, R. M. (1986). Patterns of invasion by pathogens and parasites. In Ecology of Biological Invasions of North America and Hawaii (ed. Mooney, H. A. & Drake, J. A.), pp. 58–76. Springer Verlag: New York.Google Scholar
Dobson, A. P., Pacala, S. V., Roughgarden, J. D., Carper, E. R. & Harris, E. A. (1992). The parasite of Anolis lizards in the northern Lesser Antilles. I. Patterns of distribution and abundance. Oecologia 91, 110—117.Google Scholar
Duellman, W. E. & Trueb, L. (1986). Biology of Amphibians. McGraw-Hill Book Company: New York.Google Scholar
Fairchild, G. B. (1943). An annotated list of bloodsucking insects, ticks and mites known from Panama. American Journal of Tropical Medicine 23, 569–591.Google Scholar
Freeland, W. J. & Martin, K. C. (1985). The rate of expansion by Bufo marinus in Northern Australia, 1980–84. Australian Wildlife Research 12, 555–559.CrossRefGoogle Scholar
Guyatt, H. L., Bundy, D. A. P., Medley, G. F. & Grenfell, B. T. (1990). The relationship between the frequency distribution of Ascaris lumbricoides and the prevalence and intensity of infection in human communities. Parasitology 101, 139–143.CrossRefGoogle ScholarPubMed
Hearnden, M. N. (1991). The reproductive and larval ecology of Bufo marinus (Anura: Bufonidae). Ph. D. Dissertation. James Cook University of North Queensland. Townsville, Australia.Google Scholar
Jackowska, S. (1972). Lesions produced by ticks Amblyomma dissimile in Bufo marinus toads from the Dominican Republic. American Zoologist 12, 731.Google Scholar
JØrgensen, C. B. (1992). Growth and reproduction. In Environmental Physiology of the Amphibians (ed. Feder, M. E. & Burggren, W. W.) pp. 439–466. The University of Chicago Press: Chicago.Google Scholar
Keirans, J. E., Dennis, R. K. & Sharrad, R. D. (1994). Aponomma (Bothriocroton) glebopalma, n. subgen., n. sp., and Amblyomma glauerti n. sp. (Acari: Ixodida: Ixodidae), parasites of monitor lizards (Varanidae) in Australia. Journal of Medical Entomology 31, 132–147.CrossRefGoogle Scholar
Lampo, M. & Bayliss, P. (1996). Density estimates of cane toads from native populations based on mark- recapture data. Wildlife Research 23 (in the Press).CrossRefGoogle Scholar
Lampo, M. & Medialdea, V. (1996). Energy allocation patterns in Bufo marinus from two habitats in Venezuela. Journal of Tropical Ecology. 12, (in the Press).Google Scholar
Lever, R. J. A. W. (1938). The giant toad -distribution, diet and development. Fiji Agricultural Journal 16, 88.Google Scholar
Oba, M. S. P. & Schumaker, T. T. S. (1983). Estudo da biologia de Amblyomma rotundatum (Koch, 1844), em enfestações experimentais de Bufo marinus (L. 1758) sob condições variadas de umidade relativa e de temperatura do ar. Memorias do Institute Butantan 47/48, 195–204.Google Scholar
Pacala, S. W. & Dobson, A. P. (1988). The relationship between the number of parasites/host and host age: population dynamic causes and maximum likelihood estimation. Parasitology 96, 197–210.Google Scholar
Petit, G., Landau, I., Baccam, D. & Lainson, R. (1989). Description and life cycle of Hemolivia stellata, new genus new species, a haemogregarine of Brazilian toads. Annales de Parasitologie Humaine et Camparée 65, 3–15.CrossRefGoogle Scholar
Pielou, E. C. (1977). Mathematical Ecology. John Wiley & Sons, Inc: New York.Google Scholar
Poulin, R. (1994). Parasite manipulation of host behaviour: should hosts always lose? Oikos 70, 479–484.CrossRefGoogle Scholar
Robinson, L. E. (1926). The genus Amblyomma. In Ticks: a Monograph of the Ixodidea, Part IV, Vol II. (ed. Nutall, G. H. F., Warburton, C. & Robinson, L.E.). Cambridge University Press: London.Google Scholar
Sokal, R. R. & Rohlf, F. J. (1981). Biometry, 2nd edn.W.H. Freeman and Company: New York.Google Scholar
Tipton, V. J. (1972). Ectoparasites of Venezuela. Bringham Young University Science Bulletin. Biological Series 17, 1–40.Google Scholar
Van Beurden, E. (1980). Report on the results of stage 3 of an ecological and physiological study of the Queensland cane toad Bufo marinus. Report of the Australian National Parks and Wildlife Services, pp. 86–156.Google Scholar
Wenzel, R. L. & Tipton, V. J. (1966). Ectoparasites of Panama. Field Museum of Natural History: Chicago.Google Scholar
Williams, B. G. & Dye, C. (1994). Maximum likelihood for parasitologists. Parasitology Today 10, 489–493.CrossRefGoogle ScholarPubMed