Evaluating the impact of forest fragmentation on prevalence and transmission of tick pathogens / Avaliação do efeito da fragmentação florestal na diversidade de carrapatos e patógenos transmitidos por carrapatos ma região do Pontal Paranapanema, SP

AUTOR(ES)

Cássio Roberto Leonel Peterka

DATA DE PUBLICAÇÃO

2008

RESUMO

This study evaluated the impact of forest fragmentation on diversity of freeliving ticks and prevalence of tick pathogens in remaining forest fragments in the Pontal do Paranapanema, São Paulo state, Brazil. These forest fragments shelter rich and important biodiversity, with endemic and threatened species such as the black lion tamarin (Leontopithecus chrysopygus), the tapir (Tapirus terrestris), jaguar (Panthera onca), the solitary tinamou (Tinamus solitarius) and various other species of birds, mammals, reptiles, amphibians and fish. Approximately 90% of tick species parasitize exclusively wild hosts. The remainder can also have domestic animals and humans as hosts. Although most research has been directed to species of economic importance, ticks that parasitize wild animals are also relevant due to their role in maintaining enzootic pathogen levels in wild populations. Some of these species, for example, have been shown to cross-over onto non-wild hosts and promote emergent zoonoses. In fragmented habitats, the diversity of vertebrate species is normally lower than comparable habitats with minimal anthropic alteration. Thus, habitat fragmentation decreases the diversity of tick species too. To study the relationship between forest fragmentation and population ecology of ticks, ticks were collected in 8 forest fragments using dragging and visual inspection of vegetation. The index used were Jaccard´s similarity, diversity f Shannon and Patton. The linear regression model was used to compare Shannon and Patton indexes. A total of 2149 nymphs of Amblyomma spp. And 629 identified ticks was collected. The species of ticks collected was Amblyomma cajennense (94,28%), A. coelebs (1,59%), A. naponense (2,86%), A. ovale (0,64%), A. nodosum (0,32%), A. brasiliense (0,16%) e Haemaphysalis juxtakochi (0,16%). All ticks were negative by hemolimph test. The results showed a tendency of correlation between forest fragmentation and diversity of tick species.

ASSUNTO(S)

zoonosis parasitologia zoonoses forest fragmentation doenças infecciosas emergentes emerging infectious diseases carrapatos ticks parasitology fragmentação florestal

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