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Estimation of the prevalence of outcrossing in the hermaphrodite trematode Lecithochirium rufoviride by allozyme analysis

100%

Vilas R., Paniagua E.

Acta Parasitologica

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2004

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tom 49

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nr 1

The relative occurrence of outcrossing in two geographical populations of the digenetic trematode Lecithochirium rufoviride was investigated using starch gel electrophoresis to study the polymorphic locus Pgm-1. Assuming that the effects of mutation, genetic drift and natural selection on this locus are negligible, allozyme variation suggests the occurrence of extensive outcrossing in both populations, Ria de Arousa and Lianes (North of Spain). Therefore, the minimum outcrossing rate giving no statistically significant deviation respect to Hardy-Weinberg equilibrium was 70% and 66%, respectively. Despite of the asexual reproduction in the snail host, the possibility of self-fertilization as a component of the breeding system of this hermaphroditic helminth, and a population reproductive structure probably influenced by the habitat fragmentation, these results suggest that populations of this species in the definitive host, the European conger eel (Conger conger), are basically panmictic.

2

Quaternary structure of enzymes in trematodes of the genus Lecithochirium: inference from allozymic patterns

80%

Vilas R., Paniagua E., Sanmartin M. L.

Acta Parasitologica

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2002

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tom 47

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nr 4

The quaternary structure of ten enzymes in hemiurid flukes of the genus Lecithochirium (Digenea, Hemiuridae) was inferred using allozyme electrophoresis. Allozyme variants with single-banded homozygotes and double-banded heterozygotes characteristic of monomeric enzymes were observed for aconitase, adenosine deaminase and phosphoglucomutase. The phenotypic variation (single-banded and triple-banded profiles) detected for glucose phosphate isomerase, isocitrate dehydrogenase, phosphogluconate dehydrogenase and malate dehydrogenase, suggest a dimeric structure for these enzymes. These results are consistent with structures already known for invertebrates, including parasitic helminths. Atypical heterozygote patterns were observed for fumarase and malic enzyme, both of which revealed monomeric profiles. Moreover, in the genus Lecithochirium, both monomeric and dimeric isozymes for hexokinase may be present. However, there are other possible explanations for the unusual triple-banded pattern detected for this enzyme. The results are discussed in the context of possible variations in subunit number of homologous enzymes within phylogenetically diverse groups such as parasitic helminths, and compared with those of previous studies using allozyme analysis.

3

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Intestinal Helminths of the red fox [Vulpes vulpes L.] in Galicia [Northwest Spain]

71%

Alvarez M. F., Iglesias R., Garcia J., Paniagua E., Sanmartin M. L.

Wiadomości Parazytologiczne

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1995

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tom 41

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nr 4

429-442

The intestinal helminth fauna of 201 specimens of Vulpes vulpes, captured in Galicia (northwest Spain), was investigated. Eight species were found: Toxocara canis (23% of host specimens), Toxocara cali (0.5%), Toxascaris leonina (1%), Uncinaria stenocephala (28%), Seuratascaris numidica (0.5%), Taenia crassiceps (23%), Mesocestoides litteralus (2.5%) and Dipylidium caninum (0.5%). We discuss possible relationships between human population density and the prevalence of infection of fox by intestinal helminths.

Ograniczanie wyników

2 Acta Parasitologica

1 Wiadomości Parazytologiczne

3 Paniagua E.

2 Sanmartin M. L.

2 Vilas R.

1 Alvarez M. F.

1 Garcia J.

1 Iglesias R.

1 2004

1 2002

1 1995

Estimation of the prevalence of outcrossing in the hermaphrodite trematode Lecithochirium rufoviride by allozyme analysis

Quaternary structure of enzymes in trematodes of the genus Lecithochirium: inference from allozymic patterns

Intestinal Helminths of the red fox [Vulpes vulpes L.] in Galicia [Northwest Spain]