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标题：Análisis comparado de las especies del género Bryconamericus (Teleostei: Characidae) en la cuenca de los ríos Cauca-Magdalena y Ranchería, Colombia
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作者：César Román-Valencia ; James Vanegas-Ríos ; María García 等
期刊名称：Revista Mexicana de Biodiversidad
印刷版ISSN：1870-3453
出版年度：2009
卷号：80
期号：002
出版社：Instituto de Biología
摘要：We reviewed Bryconamericus species from the Cauca, Magdalena and Ranchería rivers in Colombia using type and new specimens. The geographic distribution of B.caucanus was determined. We determined the morphological variation among Bryconamericus species analyzed using meristic, morphometric and osteological characters. The shape of Bryconamericus was analyzed using principal component analysis (PCA), in which measurements were previously processed to correct for the effect of size. The number of vertebrae differentiated B. caucanus from other species of the Magdalena River (37-39 vs.40-42). Bryconamericus arilepis Roman-Valencia et al 2008 differs from other Río Magdalena Bryconamericus in lateral-line scales (50-54 vs. 34-50) and scales between dorsal-fin origin and lateral line (9-11 vs. 5-8). The index of form (IF) built with PCA confi rmed the validity of species that share the same shape: B. caucanus Eigenmann 1913 and B. plutarcoi Roman-Valencia 2001, B. tolimae Eigenmann 1913, B. huilae Roman-Valencia 2003, B. arilepis and Bryconamericus sp. nov. Román-Valencia, Vanegas-Ríos and Ruiz-C. in press, and the 2 groups were distinguishable from each other. An ANOVA showed significant differences in pelvic-fin length among species of Bryconamericus (F = 44.7, p = 0000). Anal-fin length was also useful to distinguish the studied species (F = 44.03, p = 0000). Populations of B. caucanus from the lower Río Cauca show greatest similarity in shape with all other populations from Río Ranchería, upper and lower Cauca, and middle Magdalena. Hemibrycon dentatus and H. decurrens are shown to be synonyms of B. caucanus . We reconfirm the existence of 2 new species of Bryconamericus from Río Sogamoso, in the Río Magdalena basin. The geographical distribution of B. caucanus in the Sinú, Ranchería, Cauca and lower Magdalena river basins is established.
关键词：taxonomy;tropical fish;populations;geographic variation;Bryconamericus;taxonomía;pez tropical;poblaciones;variación geográfica;Bryconamericus