Browsing by Author "Canales-Aguirre, Cristian B."

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    Genetic identification of benthic polychaetes in a biodiversity hotspot in the southeast Pacific
    (2011) Canales-Aguirre, Cristian B.; Rozbaczylo, Nicolas; Hernandez, Cristian E.
    The aim of this study was to evaluate the utility of COI, of the mitochondrial DNA, for the taxonomic determination of soft-bottom benthic polychaetes in the Chiloe Inner Sea as a particularly important zone for polychaete fauna of the southeast Pacific. The results show high genetic differentiation between morphological species of polychaetes (posterior probabilities upper 0.9), and Onuphis pseudoiridescens showed the greatest divergence (3.08 +/- 0.08 S. D.). The results support the role of the COI gene as a useful molecular marker for fast and accurate taxonomic determination of benthic polychaetes. This study leads the way for research on the biodiversity and systematics of polychaetes off the Chilean coast using molecular phylogenetic criteria.
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    Morphological and molecular characterization of Perinereis gualpensis (Polychaeta: Nereididae) and its phylogenetic relationships with other species of the genus off the Chilean coast, Southeast Pacific
    (2013) Sampertegui, Sandra; Rozbaczylo, Nicolas; Canales-Aguirre, Cristian B.; Carrasco, Franklin; Hernandez, Cristian E.; Rodriguez-Serrano, Enrique
    The genus Perinereis, family Nereididae, consists of approximately 66 worldwide distributed species with marine, estuarine, and freshwater representatives. The objective of this study is to use morphological and molecular traits to evaluate the taxonomic differentiation of the estuarine polychaete P gualpensis. Also we reconstruct the phylogenetic relationships between P gualpensis and congeneric species recorded in Chilean coast: P. falklandica, P. longidonta and, especially with the morphologically most similar species, P vallata. Phylogenetic analyses based on molecular and morphological characters allow us to validate P. gualpensis and P. vallata as two independent and clearly defined species. Consequently, the taxonomic confusion about the possible sibling species P. gualpensis and P. vallata is completely resolved. However, morphological and genetic data are partially incongruent about the phylogenetic relationships of these four Perinereis species. We concluded that different evolutionary process that affect the morphological and genetics data produce different answers. Also we propose the use of new molecular evidence arising from molecular markers with different nucleotide substitution rate to that used here.