Revista de biología marina y oceanografía
versión On-line ISSN 0718-1957
HLEAP, Jose Sergio; MEJIA-FALLA, Paola Andrea y CARDENAS, Heiber. Relaciones morfométricas de la raya redonda Urotrygon rogersi: implicaciones cuantitativas bajo modelos linealesMorphometric relationships of the round ray Urotrygon rogersi: quantitative implications under linear models. Rev. biol. mar. oceanogr. [online]. 2012, vol.47, n.1, pp.35-50. ISSN 0718-1957. http://dx.doi.org/10.4067/S0718-19572012000100004.
Urotrygon rogersi is a stingray of the order Myliobatiformes, with benthic habits and trophic preference for crustaceans, is frequently caught in trawling fisheries. Such frequency could change the morphometric relationships (possible associations between variables) in this species; therefore, the 41 morphometric variables more commonly used in batoids were studied. The collinearity and correlation were evaluated among mothers, among offspring and between offspring and mothers. The variables were subject to descriptive statistics, variable transformation, collinearity test, multivariate statistics and linear and polynomial regressions. In this study, 83% of the variables showed collinearity with high values of variance inflation factor (ranging from 5.69 and 606.72), which can affect the phenotypic variance decomposition in quantitative analyses. Despite this, all variables (except 6 in mothers and 4 in pups) were linear, making easier the estimation of quantitative parameters. In 23% of the variables, the residual variance increased with ontogeny. This suggests some morphological integration, that can lead to a genetic integration (and vice versa), and finally to an evolutionary integration among the studied morphometric variables. This study contributes to the establishment of the morphometric relationships in batoids, to the correction of quantitative and evolutionary models for this group, and to the definition of probable ontogenetic and micro evolutionary changes that Urotrygon rogersi might be subject of.
Palabras clave : Variance inflation factor; morphological integration; morphometric collinearity.