Sarcocystis sp. from white-fronted goose (Anser albifrons): cyst morphology and life cycle studies

Kutkienė, Liuda; Sruoga, Aniolas; Butkauskas, Dalius

doi:10.1007/s00436-006-0196-x

Cited by 23 publications

(17 citation statements)

References 13 publications

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“…Species whose hosts are birds create the greatest ambiguity. The results of our earlier investigations (Kutkienė and Sruoga 2004;Kutkienė et al 2006) showed that morphological parameters of the walls and cystozoites (very specific shape) of type III cysts found in the white-fronted (Anser albifrons), grey-lag (A. anser) and the lesser white-fronted (A. erythropus) geese are very similar. This suggested that the same Sarcocystis species may parasitise members of the Anser genus; however, to answer this question, first and foremost, data on ultrastructure and DNA of the cysts isolated from different species of birds are needed.…”

Section: Discussionmentioning

confidence: 51%

Sarcocystis in the birds family Corvidae with description of Sarcocystis cornixi sp. nov. from the hooded crow (Corvus cornix)

et al. 2008

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Having studied 67 birds of six species of the family Corvidae, Sarcocystis cysts were found in 16 (23.9%) individuals belonging to three species. The highest prevalence of infection (35.9%) was determined in the hooded crow (Corvus cornix). Two types of sarcocysts, which were temporarily called cysts type I and type V, were determined in the corvids examined. By light microscope, type I cyst wall seemed to be thin (< 1.0 microm) and smooth. Banana shaped cystozoites measured 6.0-8.0 microm in length. By light microscope, type V cyst wall seemed striated and reached up to 2.5 microm. Banana shaped cystozoites measured 6.1-7.9 x 1.4-1.8 microm. Ultrastructurally, the cyst wall amounted to 2.1 microm and had stump-like protrusions that differed greatly in size and shape. The parasitophorous vacuolar membrane had indentations and clearly visible (up to 0.2 microm in length) microprojections, which also differed considerably in size and shape. The ultrastructure of type V cyst wall differed from all those Sarcocystis spp. described thus far. On the basis of this-Sarcocystis cornixi sp. nov.-is proposed for this type of sarcocysts. Partial sequences of 18S rRNA and 28S rRNA genes were determined for this species and a phylogenetic analysis of the Sarcocystidae family was performed. In the phylogenetic tree, S. cornixi is grouped together with Frenkelia microti, F. glareoli, S. muris, S. neurona and the unnamed Sarcocystis species whose intermediate hosts are birds. S. cornixi is the most closely related to Sarcocystis sp. (cyst type I) from the white-fronted geese.

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Section: Discussionmentioning

confidence: 51%

Sarcocystis in the birds family Corvidae with description of Sarcocystis cornixi sp. nov. from the hooded crow (Corvus cornix)

et al. 2008

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“…The walls of these sarcocysts in few details resembled type-9 cyst wall (Dubey et al 1989), which we described for Sarcocystis sp. (cyst type III) from the white-fronted goose (Anser albifrons) (Kutkienė et al 2006). However, the villar protrusions of Sarcocystis sp.…”

Section: Resultsmentioning

confidence: 99%

“…(cyst type I) from the white-fronted geese can be birds of prey, which are definitive hosts of protists of the Frenkelia genus rather than the representatives of the canine family, as has been preliminarily detected for Sarcocystis sp. (cyst type III) from the white-fronted geese (Kutkienė et al 2006).…”

Section: Resultsmentioning

confidence: 99%

“…(cyst type I) and Sarcocystis sp. (cyst type III) cysts from the white-fronted goose (Kutkienė and Sruoga 2004;Kutkienė et al 2006) and a number of sequences noted for the largest homologies determined by means of the BLAST search, which belong to different Sarcocystis and other phylogenetically close species from genus Frenkelia, Isospora, Hammondia, and Besnoitia.…”

Section: Resultsmentioning

confidence: 99%

“…It is difficult to judge about the prevalence of these parasites and their species composition in wild ducks in Europe because there are only a few publications available about this issue: sarcocysts were found in Bulgaria, Poland, and Lithuania (Kalyakin and Zasukhin 1975;Kalisińska et al 2003;Kutkienė and Sruoga 2004). The morphology of sarcocysts shows that ducks on this continent are also intermediate hosts of several species of Sarcocystis, including S. rileyi too (Kutkienė and Sruoga 2004;Kutkienė et al 2006).…”

Section: Introductionmentioning

confidence: 95%

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Sarcocystis sp. from the goldeneye (Bucephala clangula) and the mallard (Anas platyrhynchos): cyst morphology and ribosomal DNA analysis

2007

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By light microscopy, cysts of Sarcocystis sp. (cyst type I) from the goldeneye (Bucephala clangula) seemed filamentous with a smooth and thin (<1 microm) cyst wall. Ultrastructurally, the cyst wall surface was irregular with minute undulations of the primary cyst wall. These sarcocysts had type-1 cyst wall. Cystozoites were banana-shaped and measured 7.0-8.5 microm in length. By light microscopy, cysts of Sarcocystis sp. (cyst type II) from the mallard (Anas platyrhynchos) were ribbon-shaped, very long, and thin. On the surface of the wall (up to 1.5 microm), they had palisade-like villar protrusions closely crowded together. Electron micrographs showed villar protrusions (up to 1.3 microm in length) different in size and shape. The latter had short microprojections especially obvious in the oblique sections. Cystozoites were slightly bent with blunt ends, broader at one end, and measured 13.0-16.1 x 1.8-2.5 microm. Phylogenetic analysis based on the comparison of partial 28S rRNR gene sequences of Sarcocystis sp. (cyst type II) derived from the mallard, Sarcocystis sp. (cyst type I) and Sarcocystis sp. (cyst type III) both derived from the white-fronted goose (Anser albifrons) suggested that these sequences belonged to separate Sarcocystis species.

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Sarcocystis calchasi sp. nov. of the domestic pigeon (Columba livia f. domestica) and the Northern goshawk (Accipiter gentilis): light and electron microscopical characteristics

et al. 2009

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A novel highly pathogenic Sarcocystis species has been shown to cycle between the Northern goshawk (Accipiter gentilis) as definitive host and the domestic pigeon (Columba livia f. domestica) as intermediate host. However, genetically based characteristics are only available from very few bird-infecting Sarcocystis species. We therefore further characterised morphological properties of this protozoan in both hosts. Using light and electron microscopy, oocysts and sporocysts as well as schizonts and sarcocysts were characterised and compared with available morphological features of previously reported Sarcocystis species of Northern goshawks, Columbidae and genetically closely related species of other avian hosts. Sporocysts shed from day 6 on after experimental infection by the Northern goshawk were of ovoid appearance (11.9 x 7.9 microm). Ultrastructurally, schizonts of all developmental stages were found in the liver, spleen and next to or in endothelial cells of various organs of domestic pigeons 7 to 12 days after experimental infection. The cyst wall surface of slender sarcocysts (1 to 2 mm in length and 20 to 50 microm in width) was smooth and lacked protrusions. Cystozoites were lancet-shaped and measured 7.5 x 1.5 microm in Giemsa stain smears. The morphological findings, when combined with data of experimental infection and genetic studies, convergently indicate that the recently discovered Sarcocystis species represents a new species. We therefore propose to name this parasite Sarcocystis calchasi species nova.

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Sarcocystis sp. from white-fronted goose (Anser albifrons): cyst morphology and life cycle studies

Cited by 23 publications

References 13 publications

Sarcocystis in the birds family Corvidae with description of Sarcocystis cornixi sp. nov. from the hooded crow (Corvus cornix)

Sarcocystis in the birds family Corvidae with description of Sarcocystis cornixi sp. nov. from the hooded crow (Corvus cornix)

Sarcocystis sp. from the goldeneye (Bucephala clangula) and the mallard (Anas platyrhynchos): cyst morphology and ribosomal DNA analysis

Sarcocystis calchasi sp. nov. of the domestic pigeon (Columba livia f. domestica) and the Northern goshawk (Accipiter gentilis): light and electron microscopical characteristics

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