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http://repositorio.pediatria.gob.mx:8180/handle/20.500.12103/2260| Título : | Detecting a complex of cryptic species within Neoechinorhynchus golvani (Acanthocephala: Neoechinorhynchidae) inferred from ITSs and LSU rDNA gene sequences |
| Creador: | Martínez Aquino A |
| Nivel de acceso: | Open access |
| Palabras clave : | Acantocéfalos - anatomía & histología Acantocéfalos - clasificación Acantocéfalos - genética Animales Cíclidos - parasitología ADN de Helmintos - química ADN Ribosómico - química ADN Espaciador Ribosómico - química ADN Espaciador Ribosómico - genética Enfermedades de los Peces - parasitología Agua Dulce Variación Genética Helmintiasis Animal - parasitologia Intestinos - parasitología Funciones de Verosimilitud México Datos de Secuencia Molecular Perciformes - parasitología Filogenia Reacción en Cadena de la Polimerasa - veterinaria Agua de Mar Alineación de Secuencia - veterinaria Acanthocephala - anatomy & histology Acanthocephala - classification Acanthocephala - genetics Animals Cichlids - parasitology DNA, Helminth - chemistry DNA, Ribosomal - chemistry DNA, Ribosomal Spacer - chemistry DNA, Ribosomal Spacer - genetics Fish Diseases - parasitology Fresh Water Genetic Variation Helminthiasis, Animal - parasitology Intestines - parasitology Likelihood Functions Mexico Molecular Sequence Data Perciformes - parasitology Phylogeny Polymerase Chain Reaction - veterinary Seawater Sequence Alignment - veterinary |
| Descripción : | Neoechinorhynchus golvani is an intestinal parasite of freshwater and brackish water fishes distributed in Mexico. The genetic variability of 40 samples representing 12 populations from north, south, and central Mexico, and 1 from Costa Rica, was estimated by sequencing 2 nuclear genes (ITS1, 5.8S, ITS2, and LSU rDNA, including the domain D2 + D3). The length of both genes ranged from 700 to 779 base pairs (bp) and from 813 to 821 bp, for ITSs and LSU, respectively. The genetic divergence among populations ranged from 19.5 to 35.3% with ITSs and from 9.28 to 19.58% with LSU. Maximum likelihood and maximum parsimony analyses were performed for each data set and also for 2 combined data sets (ITSs + LSU rDNA with and without outgroups), showing strong similarities among trees, with high bootstrap support in all cases. Genetic divergence, in combination with phylogenetic analyses, suggested that the acanthocephalan N. golvani represents a complex of cryptic species, which is composed of at least 3 lineages. The first lineage, corresponding with N. golvani, shows a wide distribution, including localities from northeastern Mexico, southwards through central and southeastern Mexico, and further down to Costa Rica. This lineage is associated with cichlid fishes in strictly freshwater environments. Lineages 2 and 3 are distributed in brackish water systems along the Gulf of Mexico and Pacific slopes, respectively; both are associated with eleotrid fishes, and apparently represent 2 cryptic species. The diversification of the eleotrid and cichlid lineages seems to be the result of independent host-switching events from the ancestral population |
| Colaborador(es) u otros Autores: | Reyna-Fabián ME Rosas-Valdez R Razo-Mendivil U de León GP García-Varela M |
| Fecha de publicación : | 2009 |
| Tipo de publicación: | Artículo |
| Formato: | |
| Identificador del Recurso : | 10.1645/GE-1926.1 |
| Fuente: | J Parasitol 95(5):1040-7 |
| URI : | http://repositorio.pediatria.gob.mx:8180/handle/20.500.12103/2260 |
| Idioma: | eng |
| Aparece en las colecciones: | Artículos |
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