The use of helminthes parasites of Geophagus brasiliensis (Quoy &Gaimard, 1824) (Cichlidae; Perciformes) as environmental indicators / Utilização dos helmintos parasitos de Geophagus brasiliensis (Quoy &Gaimard, 1824) (Cichlidae; Perciformes) como indicadores ambientais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Some parasites of fishes can be utilized as indicators of water quality and environmental health. As intermediate and paratenic hosts, generally small and delicate, belonging to a complex relationship chain, they must vary their population in accordance to the variety of pollutant, reflects in alteration of parasitism in fishes. The choice of the fish specie as bio-indicator is a essential factor to a correct utilization as toei of environmental analysis. In this work, it was compared the parasitism of Geophagus brasiliensis (Cichlidae, Perciformes) in two rese rvo i r with different levels os antropic influence and eutrophication. The cavities, tissular and gill helminths parasites were verified. The Simpson s and Shannon s diversity indices, the HiII s evenness index, the Jaccard s, Dice s and Ochiai s interespecific association indices and the variations in prevalence and mean intensity of infection were calculated. To the model adopted the indices that better reflected the influence of environmental type and the variations that occurred inside the environment were the prevalence and intensity of infection. The interespecific association indices demonstrate the independence of relations among the helminths parasites. Through the estimate of prevalence and mean intensity of infection indices, the parasites can be utilized as indicators of environmental changes (metacercariae of Clinostomum sp. and Ancyrocephalinae) and faunistics indicators of distincts environments (metacestodes of Proteocephalidea and Cyclophyllidea and the nematode Procamallanus peraccuratus). Larvae of Contracaecum sp. were also found, whose resulting were not sufficient to a conclusion about its function as environmental indicator.

ASSUNTO(S)

helminto environmental indicators epidemiologia - indices elminths faunistics indices indicadores ambientais indices faunisticos fish peixe epidemiologics indices

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