Predicción de la edad de juveniles de sardina (Sardina pilchardus) a partir de las características de los otolitos y las características morfométricas

Autores/as

  • Andreia V. Silva Instituto Português do Mar e da Atmosfera (IPMA)
  • Isabel Meneses Instituto Português do Mar e da Atmosfera (IPMA)
  • Alexandra Silva Instituto Português do Mar e da Atmosfera (IPMA)

DOI:

https://doi.org/10.3989/scimar.04143.16A

Palabras clave:

edad diaria, otolito, sardina, peso de otolito, diámetro de otolito, norte de Portugal

Resumen


Un modelo de edad-predicción basado en las características individuales (longitud total; peso) y en las características de los otolitos (diámetro; peso) fue investigado para los juveniles de sardina, Sardina pilchardus (Walbaum, 1792). Juveniles fueron recolectados en el Norte de Portugal entre Mayo de 2004 y Enero de 2005. Los anillos de crecimiento diarios fueron contados a partir de los otolitos correspondientes a 114 juveniles entre los 7-16 cm de longitud total. La muestra fue dividida en una muestra de entrenamiento para desarrollar el modelo de edad-predicción y una muestra de prueba usada para evaluar la habilidad predictiva del modelo. El mejor modelo para predecir el logaritmo de la edad fue un modelo de regresión lineal con el diámetro de otolito. La predicción de las edades diarias fue más precisa para los individuos más jóvenes ( < 200 días). En conjunto, las edades estimadas a partir del modelo no fueron significativamente diferentes de las determinadas con los contajes de microincrementos. Las edades diarias estimadas reprodujeron de forma correcta la distribución de las edades observadas y proporcionaron estimativas comparables de crecimiento (0.041 cm dia–1). El retrocálculo del período de la fecha de nacimiento osciló entre el 29 de Septiembre de 2003 y el 22 de Julio de 2004, con un pico en Enero de 2004, fecha consistente con el período reproductor. El modelo presentado en este estudio puede ser usado cómo un método para incrementar el volumen de datos referentes a edades diarias. Debido a las variaciones espaciales y temporales en el crecimiento y supervivencia de los individuos, las relaciones morfométricas referentes a edad-otolito/pez no deben ser extrapoladas fuera de los períodos de muestreo, áreas de muestreo y talla peces/edad.

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Publicado

2015-03-30

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1.
Silva AV, Meneses I, Silva A. Predicción de la edad de juveniles de sardina (Sardina pilchardus) a partir de las características de los otolitos y las características morfométricas. Sci. mar. [Internet]. 30 de marzo de 2015 [citado 22 de julio de 2024];79(1):35-42. Disponible en: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1573

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