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Variation in the morphometrics of diplostomid metacercariae (Digenea: Trematoda) infecting the catfish, Clarias gariepinus in Tanzania

Published online by Cambridge University Press:  21 July 2009

F.D. Chibwana  and
G. Nkwengulila
F.D. Chibwana*
Affiliation:
Department of Zoology and Wildlife Conservation, University of Dar es Salaam, PO Box 35064, Dar es Salaam, Tanzania
G. Nkwengulila
Affiliation:
Department of Zoology and Wildlife Conservation, University of Dar es Salaam, PO Box 35064, Dar es Salaam, Tanzania
*
*Email: [email protected]; [email protected]
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Abstract

Diplostomum species are economically important worldwide due to their metacercariae which parasitize the eyes of fish, in both natural and aquaculture systems. However, their striking morphological similarity, especially at the metacercarial stage, makes species separation difficult. Three closely related diplostomid metacercariae, namely Diplostomum mashonense (type 3), Tylodelphys sp. 1 and 2 (type 1 and 2, respectively), coexist in the cranial cavity of the catfish, Clarias gariepinus from Mindu dam, Lake Victoria, Msimbazi, Ruvu and Kilombero rivers. The morphometrics of these three species were analysed by discriminant function analysis to investigate the degree of variation among the populations from the five localities sampled. The first canonical functions for all visual examination plots accounted for over 50% of the between-group variability. The observed differences were mainly from measurements associated with length, indicating that these measurements are important in the description of population characteristics. Visual examination of the samples along the canonical functions showed a clear between-population differentiation. The overall random assignment of individuals into their original groups was high (97%). These extensive morphometric variations introduce doubt about the reliability of measurements in the determination of species in these trematodes, as they may lead to misidentifications.

Type
Research Papers
Information
Journal of Helminthology , Volume 84 , Issue 1 , March 2010 , pp. 61 - 70
Copyright
Copyright © Cambridge University Press 2009

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References

Akiyama, T., Kajumulo, A. & Olsen, S. (1977) Seasonal variation of plankton and physico-chemical condition in Mwanza gulf Lake Victoria. Bulletin of Freshwater Fisheries Research Laboratory Tokyo 27, 49–61.Google Scholar
Ashrafi, K., Valero, M.A., Panova, M., Periago, M.V., Massoud, J. & Mas-Coma, S. (2006) Phenotypic analysis of adults of Fasciola hepatica, Fasciola gigantica and intermediate forms from the endemic region of Gilan, Iran. Parasitology International 55, 249–260.CrossRefGoogle ScholarPubMed
Baer, J.D. (1957) Trématodes et cestodes récoltes Côte d'Ivoire avec remarques sur la famille des Dicrocoeliidae Odhner et sur les parasite des demans. Revue Siusse de Zoologie 64, 547–575.CrossRefGoogle Scholar
Beverley-Burton, M. (1963) New Strigeid Diplostomum (T) mashonense n.sp. (Trematoda: Diplostomatidae) from the grey heron, Ardea cinerea L., in Southern Rhodesia with an experimental demonstration of part of the life cycle. Revue Zoologie et de Botanique Afrinaines 68, 291–306.Google Scholar
Chappell, L.H. (1995) The biology of diplostomatid eyeflukes of fishes. Journal of Helminthology 69, 97–101.CrossRefGoogle ScholarPubMed
Chappell, L.H., Hardie, L.J. & Secombes, C.J. (1994) Diplostomiasis: the disease and host–parasite interactions. pp. 59–86in Pike, A.W. & Lewis, J.W. (Eds) Parasitic diseases of fish. Tresaith, Dyfed, UK, Samara Publishing Limited.Google Scholar
Dubois, G. (1970) Synopsis des Strigeidae et des Diplostomatidae (Trematoda). Memoires de Societe Neuchâteloise des Sciences Naturelles 10, 288–376.Google Scholar
Flores, V. & Baccala, N. (1998) Multivariate analyses in the taxonomy of two species of Tylodelphys Diesing, 1850 (Trematoda: Diplostomatidae) from the Galaxias maculates (Teleostei; Galaxiidae). Systematic Parasitology 40, 221–227.CrossRefGoogle Scholar
Graczyk, T. (1991) Variability of metacercarie of Diplostomum pseudospathaceum Niewiadomska, 1984 (Trematoda, Diplostomidae). Acta Parasitologica Polonica 37, 5–9.Google Scholar
Hoglund, J. & Thulin, J. (1992) Identification of Diplostomum spp. in the retina of perch Perca fluviatilis and the lens of roach Rutilus rutilus from the Baltic Sea – an experimental study. Systematic Parasitology 21, 1–19.CrossRefGoogle Scholar
Kabika, J. (2005) Assesment of socio-economic impact of environmental flow for the lower Ruvu river basin. MSc Thesis, University of Dar es Salaam. 140 pp.Google Scholar
Kaduma, J.D. (1972) Some development and economic aspects of the Mindu Dam project Morogoro: A backgroung analysis for decision making. MA Thesis, University of Dar es Salaam, Tanzania.Google Scholar
King, P.H. & Van As, J.G. (1997) Description of the adult and larval stages of Tylodelphys xenopi (Trematoda: Diplostomidae) from Southern Africa. Journal of Parasitology 83, 287–295.CrossRefGoogle ScholarPubMed
Lunaschi, L.I. & Drago, F.B. (2006) Description of a new species of Dolichorchis (Digenea, Diplostomidae) in the cocoi heron, Ardea cocoi (Aves, Ardeidae), from Argentina. Acta Parasitologica 51, 47–50.CrossRefGoogle Scholar
Machado, P.M., Takemoto, R.M. & Pavanelli, G.C. (2005) Diplostomum (Austrodiplostomum) compactum (Lutz, 1928) (Platyhelminthes, Digenea) metacercariae in fish from the floodplain of the Upper Paraná River, Brazil. Parasitology Research 97, 436–444.CrossRefGoogle Scholar
Maganga, F.P., Butterworth, J. & Moriarty, P. (2002) Domestic water supply, competition for water resources and IWRM in Tanzania: a review and discussion paper. Journal of Physics and Chemistry of the Earth 27, 919–926.CrossRefGoogle Scholar
Mbuligwe, S.E. & Kaseva, M.E. (2005) Pollution and self-cleansing of an urban river in a developing country: a case study in Dar es Salaam, Tanzania. Environmental Management 36, 328–342.CrossRefGoogle Scholar
Musiba, M.J. (2004) Some aspects of the life cycle of Diplostomum species (Digenea: Diplostomatidae) infecting Clarias species (Clariidae) of Lake Victoria. MSc Thesis, University of Dar es Salaam. 102 pp.Google Scholar
Niewiadomska, K. (1970) An analysis of criteria for generic differentiation within the order Strigeidida (La Rue, 1926). Acta Parasitologica Polonica 18, 277–289.Google Scholar
Niewiadomska, K. (1988) Diplostomum metacercariae (Digenea) in fish of the Dgal Wielki and Warniak lakes: D. numericum sp. n. and D. baeri Dubois, 1937, with comments on the synonymy of this species. Acta Parasitologica Polonica 33, 7–24.Google Scholar
Niewiadomska, K. (1996) The genus Diplostomum – taxonomy, morphology and biology. Acta Parasitologica 41, 55–66.Google Scholar
Niewiadomska, K. (2002) Family Diplostomidae Poirier, 1886. pp. 167–196in Gibson, D.I., Jones, A. & Bray, R.A. (Eds) Keys to the Trematoda. Vol. 1, Wallingford, UK, CABI Publishing and The Natural History Museum.CrossRefGoogle Scholar
Niewiadomska, K. & Szymanski, S. (1991) Host-induced variability of Diplostomum paracaudum (Iles, 1959) metacercariae (Digenea). Acta Parasitologica Polonica 36, 11–17.Google Scholar
Niewiadomska, K. & Niewiadomska-Bugaj, M. (1995) Optimal identification for Diplostomum paracaudum (Iles, 1959) and D. pseudospathaceum Niewiadomska 1984 metacercariae (Digenea) based on morphological characters. Systematic Parasitology 30, 165–171.CrossRefGoogle Scholar
Niewiadomska, K. & Laskowski, Z. (2002) Systematic relationship among six species of Diplostomum Nordmann, 1832 (Digenea) based on morphological and molecular data. Acta Parasitolgica 47, 20–28.Google Scholar
Nkwengulila, G. (1995) Epidemiology and taxonomy of Diplostomum species (Trematoda: Diplostomatidae) infecting fish of Llyn tegid, North Wales and Ruvu basin, Tanzania. PhD Thesis, University of Liverpool. 321 pp.Google Scholar
Nkwengulila, G. & Kigadye, E.S.P. (2005) Occurrence of digenean larval in freshwater snails in the Ruvu basin, Tanzania. Tanzania Journal of Science 31, 23–30.Google Scholar
Osman, H. (2000) Rainfall runoff modeling and determination of the actual evaporation from the water balance study for Kilombero basin. MSc Thesis, University of Dar es Salaam. 137 pp.Google Scholar
Seppala, O., Karvonen, A. & Valtonen, E.T. (2004) Parasite induced change in host behaviour and susceptibility to predation in an eye fluke–fish interaction. Animal Behaviour 68, 257–263.CrossRefGoogle Scholar
Seppala, O., Karvonen, A. & Valtonen, E.T. (2005a) Impaired crypsis of fish infected with a trophically transmitted parasite. Animal Behaviour 70, 889–894.CrossRefGoogle Scholar
Seppala, O., Karvonen, A. & Valtonen, E.T. (2005b) Manipulation of fish host by eye flukes in relation to cataract formation and parasite infectivity. Animal Behaviour 70, 895–900.CrossRefGoogle Scholar
Shostak, A.W., Tompkins, J.C. & Dick, T.A. (1987) The identification and morphological variation of Diplostomum baeri bucculentum from two gull species, using metacercarial infections from least cisco from the Northwest Territories. Canadian Journal of Zoology 65, 2287–2291.CrossRefGoogle Scholar
Sudarikov, V.E. (1971) Order Strigeida (La Rue, 1926) Sudarikov, 1959: Sub order Strigeata La Rue, 1926: Part V. Metacercariae and Mesocercariae. pp. 160–199in Skrjabin, K.I. (Ed.) Trematodes of animals and man. Fundamentals of trematology [English translation]. New Delhi, Amerind Publishing.Google Scholar
Tabachnick, B.G. & Fidell, L.S. (1996) Using multivariate statistics. 3rd edn.880 pp. London, HarperCollins.Google Scholar