Structure and diversity of endoparasitic infracommunities and the trophic level of Pseudoplatystoma corruscans and Schizodon borelli (Osteichthyes) of the high Paraná river

Memórias do Instituto Oswaldo Cruz

Marion Haruko Machado²  Gilberto Cezar Pavanelli¹  Ricardo Massato Takemoto¹ 

[1] ,Universidade Estadual de Maringá DBI/NUPELIA Maringá PR ,Brasil

关键词: endohelminths;    freshwater fish;    Pseudoplatystoma corruscans;    Schizodon borelli;    high Paraná River;    diversity;    structure of infrapopulations;    Brazil;   

DOI  :  10.1590/S0074-02761996000400010

来源: SciELO

【 摘 要 】

One hundred and ten specimens of Pseudoplatystoma corruscans (Pimelodidae) and 582 specimens of Schizodon borelli (Anostomidae) collected in the high Paraná River were analyzed. On necropsy 74% of P. corruscans were found to be parasitized; proteocephalidean cestodes presented the greatest number. With regard to S. borelli, the percentage of parasitism reached 19.42% and the nematode Cucullanus pinnai was the most abundant. The absence of correlation between the endoparasitic diversity and the standard length of the two host species indicates that each one presents homogeneity in alimentary behaviour during all its life time, permiting the uniform recruitment of the same species of endoparasites during all its ontogenetic development. Independence of diversity values in relation to sex of P. corruscans and S. borelli evidences that the ecological relationships are similar between males and females in these species. Both host's infrapopulations presented a typical overdispersed pattern of distribution with isolationist characteristics.

【 授权许可】

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