Host-parasite relationships of monogeneans in gills of Astyanax altiparanae and Rhamdia quelen of the São Francisco Verdadeiro River, Brazil

Parasite

and G. Baumgartner²  M.C. Makrakis²  L.C. Oliveira²  R.M. Takemoto¹  A.P. Ferrari-Hoeinghaus¹ 

[1] Nupélia, Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá, Avenida Colombo, 5790,87020-900,Maringá,Paraná,Brasil;Universidade Estadual do Oeste do Paraná, Curso de Engenharia de Pesca. Rua da Faculdade, 645,caixa postal 520,85903-000, Jardim La Salle, Toledo,Paraná,Brasil

关键词: river impoundment;    prevalence;    weight-length relationship;    condition factor;    poisson;    monogeneans;   

Others  :  808680
DOI  :  doi:10.1051/parasite/2006134315

 received in 2006-04-18, accepted in 2006-10-03,  发布年份 2006

【 摘 要 】

This study investigates the ecology of monogenean gill parasites of Astyanax altiparanae Garutti & Britski, 2000 and Rhamdia quelen (Quoy & Gaimard, 1824) in a stretch of the São Francisco Verdadeiro River, Paraná, Brazil. Statistical and ecological indices were used to examine observed levels of parasitism in relation to host and environmental characteristics. A. altiparanae and R. quelen had infestation intensities of 2.8 and 23.1 parasites per fish, respectively. The only significant environmental influence was observed at the upstream station for R. quelen. For both host species, parasitized and non-parasitized individuals presented similar weight-length relationships. Parasitized individuals had dispersed Kn values indicating abnormal conditions. The low levels of parasitism observed in this study suggest that the environment is relatively undisturbed. Additional studies should compare these two species and their respective parasites following completion of the hydroelectric headquarters planned for construction in this stretch of the São Francisco Verdadeiro River.

【 授权许可】

   
© PRINCEPS Editions, Paris, 2006