Resumen

MATEO, cisco J; DELGADO, Nereida  y  LOPEZ, Héctor. Caracterización morfométrica del  híbrido Yaque pintado (Pseudoplatystoma Fasciatum x Leiarius Marmoratus) y sus progenitores (Siluriformes: Pimelodidae). Rev. Fac. Cienc. Vet. [online]. 2008, vol.49, n.1, pp.047-060. ISSN 0258-6576.

Morphometric Characterization  of the Yaque Pintado Hybrid (Pseudoplatystoma fasciatum x Leiarius marmoratus) and its Parents (Siluriformes: Pimelodidae) Abstract  In order to elucidate both the divergences and the convergences in body shape between the yaque pintado hybrid and its parents, an exploratory analysis of total body shape and of different body regions was carried out. To test if a coefficient within the component was statistically different from zero, a principal component analysis (PCA) with covariance matrixes and correlation was done, with the aid of the jackknife method. Results of the analyses show that the hybrid exhibits the general body shape of the parental species P. fasciatum. Furthermore, it was also corroborated that the PCA with the correlation matrix allowed to extract a better isometric size vector in most of the cases, but it did not allow to verify the relationships within the groups studied, due to the fact that their graphs in general, placed hybrids in an intermediate position relative to their parents, giving the impression that hybrids practically inherit the characters from each parent in equal proportions. On the other hand, when the PCA, along with the application of the covariance matrix was applied, the resulting graphs did allow the visualization of the relationship between groups.

Palabras clave : Pseudoplatystoma fasciatum; Leiarius marmoratus; hybrids; phenotypes; body parts; body measurements.

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