Identificación de las poblaciones de pota saltadora (Ommastrephes bartramii) en el Pacífico Norte a partir de la morfología de estatolitos y mandíbulas

Autores/as

  • Zhou Fang College of Marine Sciences, Shanghai Ocean University
  • Bilin Liu College of Marine Sciences, Shanghai Ocean University - The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation - The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education
  • Jianghua Li College of Marine Sciences, Shanghai Ocean University - The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation - The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education
  • Hang Su College of Marine Sciences, Shanghai Ocean University
  • Xinjun Chen College of Marine Sciences, Shanghai Ocean University - The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation - The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education

DOI:

https://doi.org/10.3989/scimar.03991.06A

Palabras clave:

Ommastrephes bartramii, estatolito, mandíbula, morfología, stock, análisis discriminante

Resumen


Los cefalópodos son cada vez más importantes en las pesquerías mundiales como consecuencia de su volumen de capturas, jugando un importante rol en la red trófica de los ecosistemas marinos. Ommastrephes bartramii es una especie de cefalópodo pelágico con dos poblaciones de desove de amplia distribución en el Pacífico Norte. Asímismo, es un importante objetivo de las flotas pesqueras chinas de potera automática. La adecuada identificación de sus dos poblaciones de desove es fundamental para la gestión de esta pesquería, siendo una difícil tarea debido a su morfología similar. En este estudio se pretende identificar los stocks en función de los análisis discriminantes de nueve variables morfológicas del estatolito y doce variables de las mandíbulas, obtenidas en muestras de O. bartramii del Pacífico Norte. Se hallaron diferencias significativas entre sexos en las variables mandíbula y estatolito para el stock del noreste (stock NE) (P < 0.05). El stock del noroeste (stock NO) mostró diferencias significativas entre sexos en todas las variables (P < 0.05) con excepción de la longitud del ala superior (P > 0.05), las medidas del estatolito no mostraron diferencias significativas en ambos sexos para el stock NO (P > 0.05). Para cada sexo, también se hallaron diferencias entre las estructuras duras de ambos stocks. Los tests T-Student mostraron diferencias entre las hembras de ambos stocks en relación a la morfología del estatolito (P < 0.05) y la mandíbula (P < 0.05), las muestras de los machos también mostraron estas diferencias en la morfología de los estatolitos (P < 0.05), excepto la longitud dorsal del domo y la anchura del rostro (P > 0.05), no observándose diferencias entre las cohortes de machos (P > 0.05) en las variables morfométricas de la mandíbula entre los dos stocks. En comparación con el uso de una sola estructura dura, el estudio conjunto de ambas estructuras mediante análisis discriminante incrementó en cerca de un 20% la correcta asignación a los diferentes stocks, a pesar de algunos solapamientos observados en los diagramas de dispersión del stock NO. Se puede considerar que el empleo adicional de estructuras duras adecuadas aumentará la probabilidad de identificar los stocks mediante análisis discriminante.

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2014-06-30

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Fang Z, Liu B, Li J, Su H, Chen X. Identificación de las poblaciones de pota saltadora (Ommastrephes bartramii) en el Pacífico Norte a partir de la morfología de estatolitos y mandíbulas. Sci. mar. [Internet]. 30 de junio de 2014 [citado 22 de julio de 2024];78(2):239-48. Disponible en: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1535

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