Urbanization effects on the host/parasite relationship in fishes from tributary streams of Pirapo River, Parana State: assessment of potential environmental bioindicators/Efeitos da urbanizacao na relacao parasito/hospedeiro em peixes provenientes de riachos tributarios do rio Pirapo, Estado do Parana: avaliacao de potenciais bioindicadores ambientais

• Published in: Acta scientiarum. Biological sciences 2015-07, p.319
• Main Authors: Moreira, Luis Henrique de Aquino, Takemoto, Ricardo Massato, Pavanelli, Gilberto Cezar
• Format: Article
• Language: Spanish
• ISSN: 1679-9283
• DOI: 10.4025/actascibiolsci.v37i3.27201

A parasitological study was conducted with 131 fishes belonging to the following species: Poecilia reticulata and Rhamdia quelen species. Samplings occurre d in tributaries streams of Pirapo River, located in the urban and rural area on the surrounding of Maringa city, State of Parana. The aim of the study was to evaluate the use of fish endoparasites to determine the environmental quality of streams. There was a high similarity between parasites species considering both sets of environments. No influence of streams groups (urban and rural) on the parasites (Sebekia oxycephala and Cucullanus (Cucullanus) pinnai) prevalence and abundance was found. The Relative Condition Factor (Kn) was not different in urban and rural environments to P. reticulata species, but in R. quelen it was significantly higher in urban environments. The parasitism does not interfere in Kn, but was statistically significant in females of P. reticulata when evaluated separately by environment (urban and rural). In urban environments, the parasite S. oxycephala becomes more pathogenic resulting in lower Kn in P. reticulata females. In these, the parasite abundance resulted in negative correlation with Kn in urban streams, suggesting parasite potential damaged action in the anthropized streams. It was verified that the parasite species S. oxycephala and Cucullanus (C.) pinnai are inadequate as bioindicators of environmental quality. Keywords: relative condition factor (Kn), endoparasites, Sebekia oxycephala, Cucullanus (Cucullanus) pinnai, urban and rural streams, IndVal. Um estudo ictioparasitologico foi realizado com 131 peixes pertencentes as especies: Poecilia reticulata e Rhamdia quelen. As amostragens foram realizadas em riachos tributarios do rio Pirapo, localizados em areas urbanas e rurais no entorno da cidade de Maringa, Estado do Parana. O objetivo do estudo foi avaliar o uso de endoparasitas de peixes para determinar a qualidade ambiental dos riachos. Houve uma alta similaridade entre as especies de parasitos identificados em ambos os ambientes estudados. Nao foi observada influencia dos grupos de riachos (urbanos e rurais) sobre a prevalencia e abundancia dos parasitos (Sebekia oxycephala e Cucullanus (Cucullanus) pinnai). O Fator de Condicao Relativo (Kn) nao diferiu entre os ambientes urbanos e rurais para a especie P. reticulata, porem em R. quelen foi significativamente mais elevado em ambientes urbanos. O parasitismo nao interfere no Kn, mas foi estatisticamente signif