Helmintofauna de Columba livia (Aves, Columbidae), no município de Juiz de Fora, Minas Gerais, Brasil: aspectos da ecologia, morfologia e sistemática

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of the present study was to obtain data on helminth fauna in Columba livia, in municipality of Juiz de Fora, Minas Gerais, Brasil; to describe the structure of the helminth infracommunities present in this host and to clarify questions concerning morphology, sistematics and ecology of some of the component species. The helminthological study of 35 hosts revealed the presence of two digenetic trematodes, Tanaisia (Paratanaisia) bragai (prevalence 51.42%, mean intensity 288.8 403.86 and mean abundance 148 320.9) and T. inopina (prevalence 2.85% and mean abundance 0.68 4.05); five cestodes, Raillietina allomyodes (prevalence 34.28%, mean intensity 6.66 9.14 and mean abundance 2.28 6.11), Raillietina sp. (prevalence 37.14%, mean intensity 9 10.68 and mean abundance 3.34 7.7), Skrjabinia bonini (prevalence 20%, mean intensity 2.14 1.21 and mean abundance 0.42 1), Skrjabinia sp.( prevalence 5.7%, mean intensity 6 7 and mean abundance 0.34 7) and Fuhrmanneta sp. (prevalence 2.85% and mean abundance 0.028 0.16) and four nematodes, Baruscapillaria obsignata (prevalence 51.42%, mean intensity 29.72 44.2 and mean abundance 15.28 34.7); Ascaridia columbae (prevalence 51.42%, mean intensity 60.55 79.88 and mean abundance 31.14 64.2); Tetrameres fissipina (prevalence 14.28%, mean intensity 346.3 504.4 and mean abundance 49.42 212.1) and Synhmanthus (Dyspharynx) nasuta (prevalence 2.85% and mean abundance 0.028 0.16). Among the examined hosts, 97.2 % were found parasitized by at least one helminth species. In accordance with the prevalence of each species T. bragai, A. columbae and B. obsignata were considered secondary species and T. inopina, T. fissipina, S. nasuta, S. bonini, Skrjabinia sp., R. allomyodes, Raillietina sp. and Fuhrmanneta sp. were considered satellite species. All the species exhibited aggregate distributions, wich is the most common distribution pattern in helminth populations. Taxonomic and ecologic aspects of B. obsignata infrapopulations were analised and the results are discussed in terms of possible factors influencing the processes that lead to niche restriction and biased sex ratios in parasite infrapopulations. Additionaly, studies on morphology and sistematics of some component species were performed. Tanaisia (Paratanaisia) bragai and T. inopina specimens were analised by means of confocal laser scanning microscopy. Two new species of Raillietina and Skrjabinia were described and the sequences of the ITS2 ribossomal DNA of these species were determined and combined with other available Raillietina and Skrjabinia sequences in GenBank, in order to perform a phylogenetic study.

ASSUNTO(S)

infracomunidades morfologia sistemática. parasitologia helminth fauna sistematics. helmintofauna infracommunities morphology

ACESSO AO ARTIGO

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