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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.12 no.4 Curitiba  1995 

Influence of the type of environment and of the hydrological level variation in endoparasitic infrapopulations of Pseudoplatystoma corruscans (Agassiz) and Schizodon borelli (Boulenger) (Osteichthyes) of the high Paraná River, Brazil



Marion H. MachadoI; Gilberto C. PavanelliII; Ricardo M. TakemotoIII

IDepartamento de Biologia, NUPÉLIA, Universidade Estadual de Maringá. Av. Colombo 5790, 87020-900 Maringá, Paraná, Brasil
IIPesquisador do CNPq
IIIUniversidade Federal de São Carlos. Via Washington Luiz km 235, Caixa Postal 676, 13565-905 São Carlos, São Paulo, Brasil




One hundred and ten specimens of Pseudoplatystoma corruscans (Agassiz, 1829) (Pimelodidae), "pintado", and 582 specimens of Schizodon borelli (Boulenger, 1900) (Anostomidae), "piava", collected in the floodplain of the high Paraná River were analyzed. P. corruscans presented 74.54% of parasitism while S. borelli presented 19.42%. Results of the present research show that in the case of P. corruscans, two species of proteocephalideans presented a significant relationship with the type of environment with regard to prevalence. Spasskyelina spinulifera (Woodland, 1935) was the only species that presented a relationship between the intensity of infection and the environment. In S. borelli only Cucullanus pinnai Travassos. Artigas & Pereira, 1928 presented a relationship with the environment. In this case the mean intensity was greater in lentic environments. The high values of the similarity index in the three environments studied indicate a considerable homogeneity of the endohelminths' species with regard to P. corruscans and S. borelli. This is probably due to what occurs with environments during the high water period when they are interlinked. The hydrological level was a less influential variable in endoparasitic infrapopulations of the hosts studied. In P. corruscans only three species, S. spinulifera, Nomimoscolex sudobim Woodland, 1934 and Megatnylacus travassosi Pavanelli & Rego, 1992 presented higher mean intensities in the high water period. This fact was also observed in the case of C. pinnai in S. borelli.

Key words: Ecology, endohelminths, freshwater fish, environment



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ACKNOWLEDGMENTS. This paper is part of an interdisciplinary project, "Environmental studies of the Paraná River floodplain in the area comprehending the mouth of the River Paranapanema and the Itaipu Reservoir", undertaken with the help of PADCT/CIAMB, which we thank for the financial support. Acknowledgment is due to NUPELIA (Nucleus for the Research in Limnology. Ichthyology and Aquiculture) for the logistic support.



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Recebido em 25.VIII.1995; aceito em 19.IV.1996.

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