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Variation in the helminth community structure of Thrichomys pachyurus (Rodentia: Echimyidae) in two sub-regions of the Brazilian Pantanal: the effects of land use and seasonality

Published online by Cambridge University Press:  23 October 2009

R. Simões ,
R. Gentile ,
V. Rademaker ,
P. D'Andrea ,
H. Herrera ,
T. Freitas ,
R. Lanfredi  and
A. Maldonado Jr
R. Simões
Affiliation:
Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Av. Brasil 4365 Manguinhos, 21045-900Rio de Janeiro, RJ, Brasil
R. Gentile
Affiliation:
Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Av. Brasil 4365 Manguinhos, 21045-900Rio de Janeiro, RJ, Brasil
V. Rademaker
Affiliation:
Laboratório de Biologia de Tripanosomatídeos, Instituto Oswaldo Cruz, Av. Brasil 4365 Manguinhos, 21045-900Rio de Janeiro, RJ, Brasil
P. D'Andrea
Affiliation:
Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Av. Brasil 4365 Manguinhos, 21045-900Rio de Janeiro, RJ, Brasil
H. Herrera
Affiliation:
Laboratório de Biologia de Tripanosomatídeos, Instituto Oswaldo Cruz, Av. Brasil 4365 Manguinhos, 21045-900Rio de Janeiro, RJ, Brasil
T. Freitas
Affiliation:
Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Av. Brasil 4365 Manguinhos, 21045-900Rio de Janeiro, RJ, Brasil Universidade Federal do Mato Grosso, Av. Fernando Correia da Costa, sem número Coxipó, 78060-900Cuiabá, MT, Brasil
R. Lanfredi
Affiliation:
Laboratório de Biologia de Helmintos Otto Wucherer, Instituto de Biofísica Carlos Chagas Filho, CCS, bl. G. Universidade Federal do Rio de Janeiro, Ilha do Fundão, 21949-900Rio de Janeiro, RJ, Brasil
A. Maldonado Jr*
Affiliation:
Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Av. Brasil 4365 Manguinhos, 21045-900Rio de Janeiro, RJ, Brasil
*
*Fax: +55-21-25621253 E-mail: [email protected]
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Abstract

The Pantanal is a large ecosystem located in South America. This preserved area is seasonally flooded due to abundant rainfall during the summer and the subsequent overflow of the Paraguai River. In this paper, we examine the helminth community structure in the wild rodent Thrichomys pachyurus during the wet and dry seasons in two locations of the preserved and cattle ranching areas in the Southern Pantanal. We identified 12 species of helminth, and, although we did not find any differences in species richness between locations within the Pantanal, we found that richness was higher during the wet season. Helminth species were largely aggregated in both farm locations and during seasons. The most common helminth species were more abundant during the dry season than during the wet season, which may have been due to the increased habitat availability and rodent population increase. The intensity of the infection also followed the same pattern for most helminths. The trichostrongylids (Heligmostrongylus crucifer, H. almeidai and Pudica cercomysi) were dominant at both farm locations. The land use of each area was not correlated with helminth diversity. However, species composition of the helminth community of T. pachyurus differed between locations and may be correlated with environmental differences between the habitats. The seasonality of the Pantanal was highly correlated with helminth parasitism in T. pachyurus.

Type
Research Papers
Information
Journal of Helminthology , Volume 84 , Issue 3 , September 2010 , pp. 266 - 275
Copyright
Copyright © Cambridge University Press 2010

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