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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: pdf
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
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