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Multiple simultaneous speciation in killifishes of the Cynolebias adloffi species complex (Cyprinodontiformes, Rivulidae) from phylogeography and chromosome data

2006; Wiley; Volume: 44; Issue: 1 Linguagem: Inglês

10.1111/j.1439-0469.2005.00346.x

1439-0469

Graciela García,

Ichthyology and Marine Biology

Journal of Zoological Systematics and Evolutionary ResearchVolume 44, Issue 1 p. 75-87 Multiple simultaneous speciation in killifishes of the Cynolebias adloffi species complex (Cyprinodontiformes, Rivulidae) from phylogeography and chromosome data Especiación Simultánea y Múltiple en peces anuales del complejo de especies Cynolebias adloffi (Cyprinodontiformes Rivulidae) desde la filogeografía y datos cromosómicos. G. García, G. García Sección Genética Evolutiva, Facultad de Ciencias, UDELAR, Montevideo, UruguaySearch for more papers by this author G. García, G. García Sección Genética Evolutiva, Facultad de Ciencias, UDELAR, Montevideo, UruguaySearch for more papers by this author First published: 01 February 2006 https://doi.org/10.1111/j.1439-0469.2005.00346.xCitations: 31 Author's address: Dr. Graciela García, Instituto de Biología, Sección Genética Evolutiva, Facultad de Ciencias, UDELAR, Iguá 4225, Montevideo, Uruguay. E-mail: [email protected] Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstracten The annual killifishes of the genus Cynolebias Steindachner, 1876, include one of the well-supported clades composed of the Cynolebias adloffi species complex of the Bañados del Este Biosphere Reserve Site, from the Atlantic coastal wetlands in Uruguay. One member of this clade, Cynolebias charrua, has been considered as an intergradation complex of populations between C. adloffi and C. viarius by showing high levels of morphological variability. Systematic affinities between both taxa have been historically discussed. In the present study, a phylogeographic approach based on mitochondrial cytochrome b haplotype analysis and chromosome data are presented. According to the present data a scenario of a multiple simultaneous speciation process and perhaps reticulation events is possible in the C. adloffi species complex, followed by divergence associated with Quaternary marine transgressions in this region. This hypothetic scenario could explain the remarkable genetic diversity and the lack of phylogenetic resolution among clades in C. charrua, as well as the disconcordance in the phylogenetic relationships among Cynolebias from different data sets. Several parameters of DNA polymorphism and chromosome data have also suggested that populations of C. charrua from southern Laguna Merin, in eastern Uruguay and southern Brazil, could represent a relictual group from a widespread ancestral population. Chromosome rearrangements like pericentric inversions in isolated populations could have triggered cladogenetic events from this highly polymorphic population. Present analysis suggests that the metapopulation could represent the management units in these endangered killifishes and that the populations of C. charrua from the Laguna Merin basin could be included in a high-priority conservation programme. Resumenes Dentro de los peces anuales del género Cynolebias uno de los clados que recibe buen soporte estadístico está compuesto por especies del complejo Cynolebias adloffi habitante del Sitio de Reserva de la Biósfera, Bañados del Este, en las tierras bajas inundables de la costa Atlántica de Uruguay. Un miembro de dicho clado, C. charrua ha sido considerado por su gran variación morfológica, como una intergradación de poblaciones entre C. adloffi y C. viarius. Las afinidades con ambos taxa han sido históricamente discutidas. En el presente estudio se presenta un enfoque filogeográfico basado en haplotipos del citocromo b y datos cromosómicos. Los datos concuerdan con un posible escenario de especiación simultánea y múltiple en el complejo de especies C. adloffi incluyendo o no eventos de hibridización, seguido por su divergencia asociada a los eventos de transgresiones marinas durante el Cuaternario en dicha región. Este hipotético escenario podría explicar la considerable variabilidad genética y la falta de resolución en el relacionamiento de los clados en C. charrua, así como la discordancia en las relaciones filogenéticas entre especies de Cynolebias basadas en diferentes tipos de datos.Varios parámetros de polimorfismo en el ADN y los datos cromosómicos han sugerido que las poblaciones de C. charrua del sur de la Laguna Merin, en el este de Uruguay y sur de Brasil, podrían representar un grupo relictual a partir de una población ancestral polimórfica y extensa. Reordenamientos cromosómicos del tipo de inversiones pericéntricas en poblaciones aisladas, pueden haber impulsado los eventos cladogenéticos desde esta población altamente polimórfica. Los análisis presentes sugieren que la metapoblación podría representar la Unidad de Manejo en estos peces altamente amenazados y que la población de C. charrua de Laguna Merin debería ser incluida en un programa de conservación de alta prioridad. 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