Helminth communities of <i>Nectomys squamipes</i> naturally infected by the exotic trematode <i>Schistosoma mansoni</i> in southeastern Brazil

Maldonado, Arnaldo; Gentile, Rosana; Cc, Fernandes-Moraes; D’Andrea, Paulo Sérgio; Rm, Lanfredi; L, Rey

doi:10.1017/joh2006366

Cited by 25 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Usually parasite communities and infracommunities are described only numerically, specially in rodents (Fuentes et al, 2004;Maldonado Junior et al, 2006;Simões et al, 2009Simões et al, , 2011. Nevertheless, the size of the parasites is relevant information in order to understand how much parasite biomass can be sustained and how it can determine the helminth community structure.…”

Section: Discussionmentioning

confidence: 99%

Helminth communities in three sympatric rodents from the Brazilian Atlantic Forest: contrasting biomass and numerical abundance

Maldonado-Júnior²,

Luque

2012

Braz. J. Biol.

View full text Add to dashboard Cite

The study of parasite body size is an important approach to understand the different patterns of helminth community structure, once it is usually analysed using only numerical descriptors which do not capture size heterogeneity among parasite species. In the present study, we compared the pattern in the helminth community of three sympatric wild rodent species Akodon cursor, A. montensis and Oligoryzomys nigripes using numerical abundance and biomass approaches. The cestode Rodentolepis akodontis was the worm with highest biomass in the three rodents. The trichostrongylid Stilestrongylus lanfrediae presented highest biomass in O. nigripes and represented 70% of the total numeric abundance of parasites. Interestingly, for Akodon spp. the species with more biomass represented less than 10% of the total numerical abundance. Parasites with the higher numeric abundance do not have the largest body size. Although the biomass pattern is different from numeric abundance, this difference does not influence in the helminth distribution community among the three sympatric hosts. The status change of a helminth species within the community due to its volumetric dominance might justify a new approach since parasites belonging to different taxa obtain resources from the host in different ways.Keywords: biomass, abundance, helminth community structure, sympatric rodents, Atlantic Forest. Comunidades de helmintos de três roedores simpátricos da Mata Atlântica brasileira:contrastando biomassa e abundância numérica ResumoA utilização do tamanho do corpo do parasita é uma importante abordagem para compreender diferentes padrões na estrutura da comunidade helmíntica, uma vez que são utilizados apenas descritores numéricos que não necessariamente detectam a heterogeneidade no tamanho entre as espécies de parasitos. No presente estudo, comparou-se o padrão da comunidade helmíntica de três roedores silvestres simpátricos (Akodon cursor, A. montensise e Oligoryzomys nigripes), usando uma abordagem com abundância numérica e biomassa. O cestoide Rodentolepis akodontis foi o helminto com maior biomassa nos três roedores. O tricostrongilídeo Stilestrongylus lanfrediae apresentou uma alta biomassa em O. nigripes e representou 70% da abundância numérica total dos parasitas. Interessantemente, em Akodon spp., a espécie com maior biomassa, representou menos de 10% da abundância total. Parasitas com maior abundância numérica não foram aqueles com maior tamanho do corpo. Embora o padrão de biomassa determinado tenha sido diferente da abundância numérica, essa diferença não influenciou na distribuição das comunidades de helmintos nos três hospedeiros simpátricos. A mudança do status de uma espécie de helminto dentro da comunidade em função da sua dominância volumétrica pode justificar uma nova abordagem, uma vez que parasitas pertencentes a diferentes táxons podem obter recursos de seu hospedeiro de forma diferente.Palavras-chave: biomassa, abundância, estrutura da comunidade de helmintos, roedores simpátricos, Mata Atlântica.

show abstract

Section: Discussionmentioning

confidence: 99%

Helminth communities in three sympatric rodents from the Brazilian Atlantic Forest: contrasting biomass and numerical abundance

Maldonado-Júnior²,

Luque

2012

Braz. J. Biol.

View full text Add to dashboard Cite

show abstract

“…that affects some 200 million people worldwide (WHO, 2009) and about 2,3 million in Brazil (BRASIL, 2013). Schistosoma mansoni has been found in many endemic areas in Brazil naturally infecting wild animals (MODENA et al, 2008;MALDONADO et al, 2006). Nectomys squamipes, which is the main non-human definitive host of S. mansoni in Brazil (D'ANDREA et al, 2000), is characterized by its semi-aquatic habits and wide geographic distribution (BONVICINO et al, 2008;MALDONADO et al, 1994;RODRIGUES-SILVA et al, 1992;REY, 1993).…”

Section: Introductionmentioning

confidence: 99%

Biochemical and histological changes in liver ofNectomys squamipes naturally infected bySchistosoma mansoni

Neto

Alves

et al. 2013

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

The South American water rat Nectomys squamipes is a wild mammal reservoir of Schistosoma mansoni in Brazil. In the present study, wild rodents were collected in the field and categorized into two groups: infected and uninfected by S. mansoni. Blood was collected to analyze changes in the serum glucose level (mg/dL) and liver fragments were used to determine the hepatic glycogen content (mg of glucose/g tissue). The histological examination showed inflammatory granulomatous lesions in different phases of development in the liver of rodents naturally infected with S. mansoni, in some cases with total or partial occlusion of the vascular lumen. Early lesions were characterized by the presence of inflammatory infiltrate around morphologically intact recently deposited eggs. Despite the significance of these histological lesions, the biochemical changes differed in extent. N. squamipes naturally infected by S. mansoni showed no variation in hepatic glycogen reserves. These findings were accompanied by a significant increase in plasma glucose contents, probably as a consequence of amino acids deamination, which are degraded, resulting in the formation of intermediates used as precursors for the glucose formation, without compromising the reserves of liver glycogen. In the wild, naturally infected N. squamipes can maintain S. mansoni infections without undergoing alterations in its carbohydrate metabolism, which minimizes the deleterious effects of S. mansoni.Keywords: Biochemical alterations, rodents, wild reservoirs, alternative model. ResumoNectomys squamipes é um mamífero silvestre reservatório de Schistosoma mansoni no Brasil. No presente estudo, os roedores silvestres, colhidos no campo, foram classificados em dois grupos: infectado e não infectado por S. mansoni. O sangue foi colhido para análise da alteração no nível de glicose sérico (mg/dL) e fragmentos de fígado foram usados para determinar o conteúdo de glicogênio hepático (mg de glicose/g tecido). A análise histológica demonstrou lesões granulomatosas em diferentes fases de desenvolvimento no tecido hepático dos roedores naturalmente infectados com S. mansoni, localizados principalmente na região periportal, com total ou parcial oclusão do lúmen vascular. As lesões foram caracterizadas por presença de infiltrado inflamatório ao redor de ovos morfologicamente intactos recentemente depositados. Apesar da grande significância das lesões histológicas, as alterações bioquímicas não diferiram no mesmo

show abstract

“…The referred filarioid species, until now, known to parasitize the abdominal cavity of the rodent A. cursor from the same locality and from N. squamipes from Sumidouro, Rio de Janeiro (MORAES et al, 1997;MALDONADO et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Litomosoides chagasfilhoi is known to parasitize the abdominal cavities of A. cursor in Rio Bonito (MORAES et al, 1997), and N. squamipes in Sumidouro (MALDONADO et al, 2006), Rio de Janeiro State, Brazil. The leading morphological characteristics of this species are as follows: the buccal capsule is higher than it is wide and has walls thinner than the lumen, and the left spicule presents a handle longer than the blade, whose edges form large membranous wings folded longitudinally.…”

Section: Introductionmentioning

confidence: 99%

New morphological data of Litomosoides chagasfilhoi (Nematoda: Filarioidea) parasitizing Nectomys squamipes in Rio de Janeiro, Brazil

Muniz-Pereira

Gonçalves

Guimarães

et al. 2016

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

Litomosoides chagasfilhoi, originally described by Moraes Neto, Lanfredi & De Souza (1997) parasitizing the abdominal cavity of the wild rodent, Akodon cursor (Winge, 1887), was found in the abdominal cavity of Nectomys squamipes (Brants, 1827), from the municipality of Rio Bonito, Rio de Janeiro State, Brazil. This study led to addition of new morphological data and a new geographical distribution for this filarioid in Brazil. Several characters were detailed and emended to previous records of L. chagasfilhoi in N. squamipes, and confirming the original description in A. cursor: buccal capsule longer than wide with walls thinner than the lumen, right spicule slightly sclerotized, with membranous distal extremity slender, with a small tongue-like terminal portion, left spicule with handle longer than the blade, whose edges form large membranous wings folded longitudinally.Keywords: Nematoda, Filarioidea, Litomosoides chagasfilhoi, Rodentia, Cricetidae, Nectomys squamipes. ResumoLitomosoides chagasfilhoi, originalmente descrito por Moraes Neto, Lanfredi & De Souza (1997) parasitando a cavidade abdominal do roedor silvestre Akodon cursor (Winge, 1887), foi encontrado na cavidade abdominal de Nectomys squamipes (Brants, 1827), no município de Rio Bonito, Estado do Rio de Janeiro, Brasil. Este estudo propiciou a adição de novos dados morfológicos e uma nova distribuição geográfica deste filarídeo no Brasil. Vários caracteres foram detalhados e adicionados ao registro anterior de L. chagasfilhoi em N. squamipes, e confirmando a descrição original em A. cursor: cápsula bucal mais alta do que larga com paredes mais finas que o lúmen, espículo direito ligeiramente esclerotizado, com extremidade distal membranosa mais estreita, com uma pequena porção terminal em forma de língua, espículo esquerdo com cabo mais longo do que a lâmina, cujas bordas formam grandes asas membranosas dobradas longitudinalmente.

show abstract

Helminth communities of Nectomys squamipes naturally infected by the exotic trematode Schistosoma mansoni in southeastern Brazil

Cited by 25 publications

References 27 publications

Helminth communities in three sympatric rodents from the Brazilian Atlantic Forest: contrasting biomass and numerical abundance

Helminth communities in three sympatric rodents from the Brazilian Atlantic Forest: contrasting biomass and numerical abundance

Biochemical and histological changes in liver ofNectomys squamipes naturally infected bySchistosoma mansoni

New morphological data of Litomosoides chagasfilhoi (Nematoda: Filarioidea) parasitizing Nectomys squamipes in Rio de Janeiro, Brazil

Contact Info

Product

Resources

About