Made available in DSpace on 2016-04-28T20:15:34Z (GMT). No. of bitstreams: 1 2009 - Marcia Cavalcanti de Albuquerque.pdf: 3644144 bytes, checksum: 2725d61a91e99c339ad0026f5c8c14e8 (MD5) Previous issue date: 2009-02-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work had as purposes to identify the metazoan parasite species of two species of foraging fishes from the Tr?s Marias Reservoir and to describe the structure of the component parasite community, besides describe the dynamic of the parasite infracommunities and their interspecific relations. A total of 146 fishes (Characiformes, Characidae) were collected in the Tr?s Marias Reservoir (18?12'59"S, 45?17'34"W), Upper S?o Francisco River, State of Minas Gerais, in July 2007 and January 2008. Of these total, 83 specimens were of Triportheus guentheri (Garman, 1890) (Triportheinae) and 63 of Tetragonopterus chalceus Spix e Agassiz, 1829 (Tetragonopterinae). At least 24 taxa of parasites were found among the two species of fishes analyzed: Digenea: Creptotrema creptotrema Travassos, Artigas & Pereira, 1928; Monogenea: Amphithecium sp., Ancistrohaptor sp., Jainus sp., Anacanthorus sp.1, Anacanthorus sp.2 and one unidentified species of Gyrodactylidae; Eucestoda: an unidentified plerocercoid of Proteocephalidae; Nematoda: two species of adult specimens Procamallanus (Spirocamallanus) saofranciscencis (Moreira, Oliveira & Costa, 1994) and Spinitectus rodolphiheringi Vaz & Pereira, 1934; seven species of larval specimens Cystidicoloides fischeri (Travassos, Artigas & Pereira, 1928), Rhabdochona sp., Hysterothylacium sp., Contracaecum sp., Spiroxys sp., Goezia sp. e Procamallanus sp.; Copepoda: two unidentified species of Ergasilidae (sp.1 and sp.2); one unidentified specie of Isopoda; Myxozoa: Henneguya sp.; Protozoa: two unidentified species [one ectoparasite (sp.1) and one endoparasite (sp.2)] and Calyptospora sp.. Twelve species were common in the two parasite fauna analyzed: the unidentified plerocercoid, C. fischeri, Rhabdochona sp., Hysterothylacium sp., Contracaecum sp., Spiroxys sp., Goezia sp., Procamallanus sp., Henneguya sp., ectoparasite protozoan (sp.1), endoparasite protozoan (sp.2) and Calyptospora sp.. The parasite species more prevalent and considered core species were from T. guentheri only Anacanthorus sp.1; and from T. chalceus: Amphithecium sp., Ancistrohaptor sp. and P. saofranciscencis. Tetragonopterus chalceus presented parasite fauna richer than T. guentheri, however the parasite fauna of the T. guentheri was most diverse than T. chalceus. There was endoparasitic qualitative similarity between the hosts. The structure of the metazoan parasite fauna of T. guentheri and T. chalceus was similar, due of few core species, limited number of secondary species and the presence of numerous satellite species. There was high number of significant interspecific associations among the parasite species. / Este trabalho teve como objetivos identificar as esp?cies de parasitos metazo?rios de duas esp?cies de peixes forrageiros do Reservat?rio de Tr?s Marias, descrever a estrutura das comunidades parasit?rias componentes e descrever a din?mica das infracomunidades parasit?rias e seus relacionamentos interespec?ficos. Um total de 146 peixes (Characiformes, Characidae) foram coletados no Reservat?rio de Tr?s Marias (18?12'59"S, 45?17'34"W), Alto Rio S?o Francisco, Estado de Minas Gerais, em julho de 2007 e janeiro de 2008. Desse total, 83 esp?cimes eram de Triportheus guentheri (Garman, 1890) (Triportheinae) e 63 de Tetragonopterus chalceus Spix e Agassiz, 1829 (Tetragonopterinae). Pelo menos 24 esp?cies de parasitos foram encontradas nas duas comunidades componentes. Em Digenea: Creptotrema creptotrema Travassos, Artigas & Pereira, 1928; em Monogenea: Amphithecium sp., Ancistrohaptor sp., Jainus sp., Anacanthorus sp.1, Anacanthorus sp.2 e uma esp?cie n?o identificada alocada em Gyrodactylidae; em Eucestoda: plerocerc?ides n?o identificados de Proteocephalidae; em Nematoda: esp?cies cujos esp?cimes eram adultos, Procamallanus (Spirocamallanus) saofranciscencis (Moreira, Oliveira & Costa, 1994) e Spinitectus rodolphiheringi Vaz & Pereira, 1934; esp?cies cujos esp?cimes eram larvais, Cystidicoloides fischeri (Travassos, Artigas & Pereira, 1928), Rhabdochona sp., Hysterothylacium sp., Contracaecum sp., Spiroxys sp., Goezia sp. e Procamallanus sp.; em Copepoda: duas esp?cies n?o identificadas alocadas em Ergasilidae (sp.1 e sp.2); uma esp?cie n?o identificada de Isopoda; Myxozoa: Henneguya sp.; Protozoa: duas esp?cies n?o identificadas [uma de ectoparasito (sp.1) e uma de endoparasito (sp.2)] e Calyptospora sp.. Doze esp?cies foram comuns aos dois hospedeiros: plerocerc?ides n?o identificados, C. fischeri, Rhabdochona sp., Hysterothylacium sp., Contracaecum sp., Spiroxys sp., Goezia sp., Procamallanus sp., Henneguya sp., protozo?rio ectoparasito (sp.1), protozo?rio endoparasito (sp.2) e Calyptospora sp.. As esp?cies mais prevalentes e consideradas centrais nas comunidades foram: em T. guentheri apenas Anacanthorus sp.1; em T. chalceus, Amphithecium sp., Ancistrohaptor sp. e P. saofranciscencis. Tetragonopterus chalceus apresentou fauna parasit?ria mais rica, por?m a fauna de parasitos de T. guentheri foi mais diversa. Houve similaridade qualitativa de endoparasitos entre os hospedeiros. A estrutura das comunidades parasit?rias de T. guentheri e T. chalceus foi semelhante, pela baixa ocorr?ncia de esp?cies centrais, pelo n?mero limitado de esp?cies secund?rias e pela presen?a de v?rias esp?cies sat?lites. Houve muitas associa??es interespec?ficas significativas entre as esp?cies de parasitos.