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. 1998 Jan 7;265(1390):51–56. doi: 10.1098/rspb.1998.0263

Benefits of induced host responses against an ectoparasite

P Heeb, I Werner, M K lliker, H Richner
PMCID: PMC1688760

Abstract

As a consequence of the deleterious effects of parasites on host fitness, hosts have evolved responses to minimize the negative impact of parasite infection. Facultative parasite-induced responses are favoured when the risk of infection is unpredictable and host responses are costly. In vertebrates, induced responses are generally viewed as being adaptive, although evidence for fitness benefits arising from these responses in natural host populations is lacking. Here we provide experimental evidence for direct reproductive benefits in flea-infested great tit nests arising from exposure during egg production to fleas. In the experiment we exposed a group of birds to fleas during egg laying (the exposed group), thereby allowing for induced responses, and kept another group free of parasites (the unexposed group) over the same time period. At the start of incubation, we killed the parasites in both groups and all nests were reinfested with fleas. If induced responses occur and are adaptive, we expect that birds of the exposed group mount earlier responses and achieve higher current reproductive success than birds in the unexposed group. In agreement with this prediction, our results show that birds with nests infested during egg laying have (i) fewer breeding failures and raise a higher proportion of hatchlings to fledging age; (ii) offspring that reach greater body mass, grow longer feathers, and fledge earlier, and (iii) a higher number of recruits and first-year grandchildren than unexposed birds. Flea reproduction and survival did not differ significantly between the two treatments. These results provide the first evidence for the occurrence and the adaptiveness of induced responses against a common ectoparasite in a wild population of vertebrates.

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Selected References

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  1. Allen J. R. Host resistance to ectoparasites. Rev Sci Tech. 1994 Dec;13(4):1287–1303. doi: 10.20506/rst.13.4.824. [DOI] [PubMed] [Google Scholar]
  2. Devaney J. A., Augustine P. C. Correlation of estimated and actual northern fowl mite populations with the evolution of specific antibody to a low molecular weight polypeptide in the sera of infested hens. Poult Sci. 1988 Apr;67(4):549–556. doi: 10.3382/ps.0670549. [DOI] [PubMed] [Google Scholar]
  3. Graczyk T. K., Cranfield M. R., Shaw M. L., Craig L. E. Maternal antibodies against Plasmodium spp. in African black-footed penguin (Spheniscus demersus) chicks. J Wildl Dis. 1994 Jul;30(3):365–371. doi: 10.7589/0090-3558-30.3.365. [DOI] [PubMed] [Google Scholar]
  4. Hamilton W. D., Axelrod R., Tanese R. Sexual reproduction as an adaptation to resist parasites (a review). Proc Natl Acad Sci U S A. 1990 May;87(9):3566–3573. doi: 10.1073/pnas.87.9.3566. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Hart B. L. Behavioral adaptations to pathogens and parasites: five strategies. Neurosci Biobehav Rev. 1990 Fall;14(3):273–294. doi: 10.1016/s0149-7634(05)80038-7. [DOI] [PubMed] [Google Scholar]
  6. Harvell C. D. The evolution of inducible defence. Parasitology. 1990;100 (Suppl):S53–S61. doi: 10.1017/s0031182000073017. [DOI] [PubMed] [Google Scholar]
  7. Klasing K. C., Laurin D. E., Peng R. K., Fry D. M. Immunologically mediated growth depression in chicks: influence of feed intake, corticosterone and interleukin-1. J Nutr. 1987 Sep;117(9):1629–1637. doi: 10.1093/jn/117.9.1629. [DOI] [PubMed] [Google Scholar]
  8. Lehmann T. Ectoparasites: direct impact on host fitness. Parasitol Today. 1993 Jan;9(1):8–13. doi: 10.1016/0169-4758(93)90153-7. [DOI] [PubMed] [Google Scholar]
  9. Mitchison N. A. The evolution of acquired immunity to parasites. Parasitology. 1990;100 (Suppl):S27–S34. doi: 10.1017/s0031182000072991. [DOI] [PubMed] [Google Scholar]
  10. Randolph S. E. Density-dependent acquired resistance to ticks in natural hosts, independent of concurrent infection with Babesia microti. Parasitology. 1994 May;108(Pt 4):413–419. doi: 10.1017/s003118200007596x. [DOI] [PubMed] [Google Scholar]
  11. Read A. F. The evolution of virulence. Trends Microbiol. 1994 Mar;2(3):73–76. doi: 10.1016/0966-842x(94)90537-1. [DOI] [PubMed] [Google Scholar]
  12. Smith N. C., Wallach M., Petracca M., Braun R., Eckert J. Maternal transfer of antibodies induced by infection with Eimeria maxima partially protects chickens against challenge with Eimeria tenella. Parasitology. 1994 Dec;109(Pt 5):551–557. doi: 10.1017/s0031182000076423. [DOI] [PubMed] [Google Scholar]
  13. Tripet F., Richner H. The coevolutionary potential of a 'generalist' parasite, the hen flea Ceratophyllus gallinae. Parasitology. 1997 Oct;115(Pt 4):419–427. doi: 10.1017/s0031182097001467. [DOI] [PubMed] [Google Scholar]
  14. Wikel S. K. Host immunity to ticks. Annu Rev Entomol. 1996;41:1–22. doi: 10.1146/annurev.en.41.010196.000245. [DOI] [PubMed] [Google Scholar]

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