Scutes for Sturgeon Size Reconstruction: Traditional and Geometric Morphometric Techniques Applied to Acipenser sturio and A. oxyrinchus
Palabras clave:
Reconstrucción de la talla, Morfometría geométrica, Morfometría tradicional, Placa dérmica, Acipenser sturio, Acipenser oxyrinchusResumen
Se exploran alternativas tradicionales y de morfometría geométrica en la inferencia de la talla del esturión europeo (Acipenser sturio) y Atlántico (A. oxyrinchus) a partir de placas dérmicas. La correlación existente entre la longitud del pez y diferentes medidas de las placas dérmicas fue evaluada a través de regresiones lineales utilizando 58 esturiones en colecciones de museos. Dado que la precisión de tal técnica era limitada se exploró la posibilidad de determinar la posición de placas dérmicas aisladas dentro de la series corporales en función de su forma y dimensiones. Aunque en las filas laterales y dorsales la forma y tamaño de las placas cambia a lo largo del eje antero-posterior, las diferencias son demasiado graduales para poder establecer la posición original de una placa dentro de la serie. También se constataron las diferencias de talla y forma en placas procedentes de esturiones de distinto tamaño, pero estas tampoco eran suficientemente marcadas como para realizar una estimación precisa de la talla corporal. Se concluye por ello que las placas dérmicas aisladas no pueden proporcionar estimaciones precisas de la tallas corporal. No obstante, los modelos de regresión que presentamos permiten verificar si tanto las placas dérmicas laterales como las dorsales pertenecieron a esturiones de más de un metro de longitud. En caso afirmativo, las placas pueden ser identificadas a nivel de la especie a través de su ornamentación al tratarse ésta de un carácter dependiente de la talla.
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