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Variation in the sex ratio of Rhabdochona fortunatowi (Spirurida: Rhabdochonidae) in Capoeta capoeta gracilis (Cypriniformes: Cyprinidae), relative to levels of infection, host size and temperature

Published online by Cambridge University Press:  09 February 2011

M. Golestaninasab ,
M. Malek ,
B. Jalali  and
I. Mobedi
M. Golestaninasab
Affiliation:
Departmant of Zoology, School of Biology, University of Tehran, Iran
M. Malek*
Affiliation:
Departmant of Zoology, School of Biology, University of Tehran, Iran
B. Jalali
Affiliation:
Department of Aquatic Animal Disease, Faculty of Veterinary Sciences, Science and Research Branch, Islamic Azad University, Iran
I. Mobedi
Affiliation:
Faculty of Health and Hygiene, School of Medical Sciences, University of Tehran, Iran
*
*Fax: +98-21-66405141 E-mail: [email protected]
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Abstract

In the present study, 81 specimens of Capoeta capoeta gracilis (Keyserling, 1861) were collected from the Shiroud River, the Caspian drainage basin, Iran in June and October 2007. The fish were examined for infection with the nematode Rhabdochona fortunatowi (Dinnik, 1933). Nematodes were counted and sexed, then the sex ratio and intestinal site preference of the R. fortunatowi individuals and the intersexual interactions of the parasites were investigated. Significant differences were observed in the prevalence and intensity of infection in relation to host size and sampling season, but not host sex. Parasite burden (mean intensity) was higher in October than in June and the results revealed a decrease in female-to-male sex ratio (FMR) in the fish in October compared to the ones in June. In other words, as the mean intensity of infection of R. fortunatowi increases, the proportion of male worms increases, too. The female-biased sex ratio in June was replaced by a male-biased one in October. Nematode distribution rose to a significant peak in the mid-region of the fish intestine relative to the anterior and posterior parts. Some changes in the distribution of male and female worms in different parts of the host intestine were also observed during June and October. Density-dependent selection and intersexual competition seem to be the main factors driving such a shift in the sex ratio and its variation in different parts of the host intestine.

Type
Research Papers
Information
Journal of Helminthology , Volume 86 , Issue 1 , March 2012 , pp. 41 - 45
Copyright
Copyright © Cambridge University Press 2011

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References

Abu, M. (1994) Hydrology and hydrobiology of Shiroud River. Tehran, Iran, Iranian Fisheries Research Organization, Final record (in Persian).Google Scholar
Asmatullah, K., Bilqees, F.M. & Kakar, J.K. (2006) Rhabdochona kharani sp. n. (Nematoda: Rhabdochonidae) from the fish Labeo gedrosicus Zugmayer, 1912 from Garruk, District Kharan, Balochistan, Pakistan. Türkiye Parazitoloji Dergisi 30, 63–68.Google Scholar
Burgmer, T., Pfenninger, M. & Hillebrand, H. (2007) Effects of climate-driven temperature changes on the diversity of freshwater macroinvertebrates. Oecologia 151, 93–100.CrossRefGoogle ScholarPubMed
Bush, A.O., Lafferty, K.D., Lotz, J.M. & Shostak, A.W. (1997) Parasitology meets ecology on its own terms: Margolis et al., revisited. Journal of Parasitology 83, 575–583.CrossRefGoogle Scholar
Hirasawa, R., Urabe, M. & Yuma, M. (2004) Relationship between intermediate host taxon and infection by nematodes of the genus Rhabdochona. Parasitology International 53, 89–97.CrossRefGoogle ScholarPubMed
Jalali, B. (1998) Parasites and parasitic diseases of freshwater fishes of Iran. 1st edn.564 pp. Tehran, Iran, Fisheries Co. of Iran (in Persian).Google Scholar
Maleki, M. (2006) Ecological survey of helminth parasites in fishes from Shiroud River (Mazandaran province). Unpublished MSc Thesis, University of Tehran.Google Scholar
McCulloch, D. & Gems, D. (2003) Evolution of male longevity bias in nematodes. Aging Cell 2, 165–173.CrossRefGoogle ScholarPubMed
Moravec, F. (1994) Parasitic nematodes of freshwater fishes of Europe. 473 pp. Dordrecht, The Netherlands, Academia and Kluwer Academic Publishers.Google Scholar
Moravec, F. & Scholz, T. (1995) Life history of the nematode Rhabdochona hellichi, a parasite of the barbel in the Jihlava River, Czech Republic. Journal of Helminthology 69, 59–64.CrossRefGoogle ScholarPubMed
Moravec, F., Saraiva, A., Abdullah, S.M.A., Bilal, S.J. & Rahemo, Z.I.F. (2009) Two species of Rhabdochona Railliet, 1916 (Nematoda: Rhabdochonidae) parasitising cyprinid fishes in Iraq, with a redescription of R. tigridis Rahemo, 1978. Systematic Parasitology 74, 125–136.CrossRefGoogle ScholarPubMed
Pazooki, J., Masoumian, M. & Jafari, N. (2006) Check-list of Iranian fish parasites. 202 pp. Tehran, Iran, Iranian Fisheries Research Organization (in Persian).Google Scholar
Poulin, R. (1997) Population abundance and sex ratio in dioecious helminth parasites. Oecologia 111, 375–380.CrossRefGoogle ScholarPubMed
Poulin, R. (1998) Evolutionary ecology of parasites: From individuals to communities. 212 pp. London, Chapman & Hall.Google Scholar
Poulin, R. (1999) Body size vs abundance among parasite species: positive relationships? Ecography 22, 246–250.CrossRefGoogle Scholar
Poulin, R. (2000) Variation in the intraspecific relationship between fish length and intensity of parasitic infection: biological and statistical causes. Journal of Fish Biology 56, 123–137.CrossRefGoogle Scholar
Roche, M. & Patrzek, D. (1966) Female to male ratio (FMR) in hookworm. Journal of Parasitology 52, 117–121.CrossRefGoogle ScholarPubMed
Roohi, A. (2004) Ecological study of parasites of Capoeta capoeta gracilis in Shiroud River. Unpublished MSc thesis, Faculty of Biology, University of Tehran (in Persian).Google Scholar
Sharples, A.D. & Evans, C.W. (1995) Metazoan parasites of the snapper, Pagrus auratus (Bloch & Schneider, 1801), in New. Zealand. 1. Prevalence and abundance. New Zealand Journal of Marine and Freshwater Research 29, 195–201.CrossRefGoogle Scholar
Šimková, A., Jarkovský, J., Koubková, B., Baruš, V. & Prokeš, M. (2005) Associations between fish reproductive cycle and the dynamics of metazoan parasite infection. Parasitology Research 95, 65–72.CrossRefGoogle ScholarPubMed