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Density-dependent regulation of fecundity in Syngamus trachea infrapopulations in semi-naturally occurring ring-necked pheasants (Phasianus colchicus) and wild Carrion Crows (Corvus corone)

Published online by Cambridge University Press:  02 March 2016

O. J. GETHINGS ,
R. B. SAGE  and
S. R. LEATHER
O. J. GETHINGS*
Affiliation:
Department of Crop and Environment Sciences, Harper Adams University, Edgmond, Newport TF10 8NB, UK
R. B. SAGE
Affiliation:
Game and Wildlife Conservation Trust, Burgate Manor, Fordingbridge SP6 1EF, UK
S. R. LEATHER
Affiliation:
Department of Crop and Environment Sciences, Harper Adams University, Edgmond, Newport TF10 8NB, UK
*
*Corresponding author. Department of Crop and Environment Sciences, Harper Adams University, Edgmond, Newport TF10 8NB, UK. E-mail: [email protected]
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Summary

Previous work has highlighted increased opportunities for the transmission of Syngamus trachea within pheasant release pens, due in part to high levels of environmental contamination around communal areas. Despite this, the distribution of adult worms within their definitive hosts is not significantly different from predicted distributions under Taylor's power law. Therefore, density-dependent processes are probably acting to regulate S. trachea population dynamics. Patterns of nematode fecundity were investigated in a semi-naturally occurring population of ring-necked pheasants (Phasianus colchicus) and a wild population of carrion crows (Corvus carone). Worm length was a reliable indicator of nematode fecundity, and a negative association between mean worm length and mean worm burden was identified within both the species. The stunting of worms at greater parasite densities was present in both immunologically naïve and previously exposed pheasants, so is unlikely to be a function of age-dependent acquired immunity. Interestingly, the effect of parasite crowding in the crow population explained more of the variation in mean worm length, apparently driven by a greater mean worm burden when compared with pheasants. The findings of the present study suggest that fecundity is a function of parasite density, i.e. parasite-mediated competition and not host-mediated heterogeneities in immunocompetence.

Keywords

Syngamus tracheadensity dependencepheasantcrowfecundityworm lengthimmunity
Type
Research Article
Information
Parasitology , Volume 143 , Issue 6 , May 2016 , pp. 716 - 722
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Copyright
Copyright © Cambridge University Press 2016 

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References

REFERENCES

Anderson, R. M. and May, R. M. (1978). Regulation and stability of the host-parasite population interactions. Journal of Animal Ecology 47, 219–247.CrossRefGoogle Scholar
Clapham, P. A. (1935). On nodules occasioned by gapeworm in pheasants. Journal of Helminthology 13, 9–12.CrossRefGoogle Scholar
Craig, N. M., Smith, D. W., Pate, J. A., Morrison, I. W. and Knight, P. A. (2014). Local cytokine transcription in naïve and previously infected sheep and lambs following challenge with Teladorsagia circumcincta . BMC Veterinary Research 10. doi: 10.1186/1746-6148-10-87.CrossRefGoogle ScholarPubMed
Crawford, M. (1940). Infection of adult fowls with Syngamus trachealis . Indian Journal of Veterinary Science and Animal Husbandry 10, 293–294.Google Scholar
Dezfuli, B. S., Volponi, S., Beltrami, I. and Poulin, R. (2002). Intra- and interspecific density-dependent effects on growth in helminth parasites of the cormorant, Phalacrocorax carbo sinensis . Parasitology 124, 537–544.CrossRefGoogle ScholarPubMed
Dobson, A. P., Waller, P. J. and Donald, A. D. (1990). Population dynamics of Trichostrongylus colubriformes in sheep: the effect of infection rate on the establishment of infective larvae and parasite fecundity. International Journal for Parasitology 20, 347–352.CrossRefGoogle Scholar
Fernando, M. A., Stockdale, P. H. G. and Remmler, O. (1971). The route of migration, development and pathogenesis of Syngamus trachea (Motagu, 1811), Chapin 1925, in Pheasants. Journal of Parasitology 57, 107–116.CrossRefGoogle ScholarPubMed
Gethings, O. J., Sage, R. B. and Leather, S. R. (2015). Spatial distribution of the infectious stages of the nematode Syngamus trachea within release pens in the South West of England: potential density dependence? Veterinary Parasitology 212, 267–274. doi: 10.1016/j.vetpar.2015.07.016.CrossRefGoogle ScholarPubMed
Goble, F. C. and Kutz, H. L. (1945). Notes on the Gapeworms (Nematoda: Syngamidae) of Galliform and Passerifrom birds in New York State. Journal of Parasitology 31, 394–400.Google ScholarPubMed
Guilford, H. G. and Herrick, C. A. (1954). The effect of gapeworm disease in pheasants. Transactions of the Wisconsin Academy of Sciences Arts and Letters 43, 25–50.Google Scholar
Irvine, R. J., Stien, A., Dallas, J. F., Halvorsen, O., Langvatn, R. and Albon, S. D. (2001). Contrasting regulation of fecundity in two abomasal nematodes of Svalbard reindeer (Rangifer tarandus platyrhynchus). Parasitology 122, 673–681.CrossRefGoogle ScholarPubMed
Ives, A. R. (2015). For testing the significance of regression coefficients, go ahead and log-transform count data. Methods in Ecology and Evolution 6, 828–835.CrossRefGoogle Scholar
Lewis, A. (1928). Observations on the morphology of Syngamus trachea from some wild and domestic birds. Journal of Helminthology 6, 99–112.CrossRefGoogle Scholar
Luong, L. T., Vigliotti, B. A. and Hudson, P. J. (2011). Strong density-dependent competition and acquired immunity constrain parasite establishment: implications for parasite aggregation. International Journal for Parasitology 41, 505–511.CrossRefGoogle ScholarPubMed
Marcogliese, D. J. (1997). Fecundity of sealworm (Pseudoterranova decipiens) infecting grey seals (Halichoerus grypus) in the Gulf of St. Lawrence, Canada: lack of density-dependent effects. International Journal for Parasitology 27, 1401–1409.CrossRefGoogle Scholar
Michael, E. and Dunby, D. A. P. (1989). Density dependence in establishment, growth and worm fecundity in intestinal helminthiasis: the population biology of Trichuris muris (Nematoda) infection in CBA/Ca mice. Parasitology 98, 451–458.CrossRefGoogle ScholarPubMed
Morgan, D. O. and Clapham, P. A. (1934). Some observations on Gape-worm in Poultry and Game Birds. Journal of Helminthology 12, 63–70.CrossRefGoogle Scholar
Mossinger, J. and Wenk, P. (1986). Fecundity of Litomosoides carinii (Nematoda, Filarioidea) in vivo and in vitro . Parasitology Research 72, 121–131.Google ScholarPubMed
Olivier, L. (1944). Acquired resistance in chickens, turkeys, and ring-necked pheasants to the gapeworm, Syngamus trachea . Journal of Parasitology 30, 64–76.CrossRefGoogle Scholar
Paterson, S. and Viney, M. E. (2002). Host immune responses are necessary for density dependence in nematode infections. Parasitology 125, 283–292.CrossRefGoogle ScholarPubMed
Poulin, R. and Morand, S. (2000). Parasite body size and interspecific variation in levels of aggregation among nematodes. Journal of Parasitology 86, 642–647.CrossRefGoogle ScholarPubMed
Richards, D. T. and Lewis, J. W. (2001). Fecundity and egg output by Toxocara canis in the red fox, Vulpes vulpes . Journal of Helminthology 75, 157–164.Google ScholarPubMed
Sinniah, B. and Subramaniam, K. (1991). Factors influencing the egg production of Ascaris lumbricoides: relationship to weight, length and diameter of worms. Journal of Helminthology 65, 141–147.CrossRefGoogle ScholarPubMed
Skorping, A., Read, A. F. and Keymer, A. E. (1991). Life history covariation in intestinal nematodes of mammals. Oikos 60, 365–372.CrossRefGoogle Scholar
Stear, M. J. and Bishop, S. C. (1999). The curvilinear relationship between worm length and fecundity of Teladorsagia circumcincta . International Journal for Parasitology 29, 777–780.CrossRefGoogle ScholarPubMed
Stear, M. J., Bairden, K., Duncan, J. L., Holmes, P. H., McKellar, Q. A., Park, M., Strain, S., Murray, M., Bishop, S. C. and Gettinby, G. (1997). How hosts control worms. Nature 389, 27.CrossRefGoogle ScholarPubMed
Szalai, A. J. and Dick, T. A. (1989). Differences in numbers and inequalities in mass and fecundity during the egg- producing period for Raphidascaris acus (Nematoda: Anisakidae). Parasitology 98, 489–495.CrossRefGoogle Scholar
Tompkins, D. M. and Hudson, P. J. (1999). Regulation of nematode fecundity in the ring-necked pheasant (Phasianus colchicus): not just density dependence. Parasitology 118, 417–423.CrossRefGoogle Scholar
Walker, M., Hall, A., Anderson, R. M. and Basanez, M. G. (2009). Density-dependent effects on the weight of female Ascaris lumbricoides infections of humans and its impact on patterns of egg production. Parasites and Vectors 2.CrossRefGoogle ScholarPubMed
Wehr, E. E. (1937). Observations on the development of poultry gapeworm Syngamus trachea . Transactions of the American Microscopical Society 56, 72–78.CrossRefGoogle Scholar
Williams, I. C. and Newton, I. (1969). Intestinal helminths of the bullfinch pyrrhula pyrrhula (l.), in southern England. Journal of the Helminthological Society of Washington 36, 76–82.Google Scholar