Estructura genética poblacional de dos especies piscícolas, una de estuario y una de arrecife, explotados por la pesca artesanal brasilera

Autores/as

  • Regina H.G. Priolli Fisheries and Food Institute, FIFO, PPG Ecomar, UNISANTA - Nepa, Capesca, UNICAMP
  • Miklos M. Bajay Department of Genetics, ESALQ, USP
  • Renato A.M. Silvano Fisheries and Food Institute, FIFO, PPG Ecomar, UNISANTA - Department of Ecology, UFRGS
  • Alpina Begossi Fisheries and Food Institute, FIFO, PPG Ecomar, UNISANTA - Nepa, Capesca, UNICAMP

DOI:

https://doi.org/10.3989/scimar.04407.17A

Palabras clave:

pesquerías a pequeña escala, microsatélites, diversidad genética, róbalo, mero, cuello de botella

Resumen


En este estudio se han utilizado marcadores microsatélites para examinar la estructura genética de Centropomus undecimalis (Bloch, 1792) y Epinephelus marginatus (Lowe, 1834) en localidades de pesca artesanal localizadas a lo largo de la costa del sudeste de Brasil. Los estadísticos de diferenciación poblacional (F-statisctics) no presentaron diferenciación genética entre las muestras de C. undecimalis (FST=0.012). Sin embargo, los resultados de los análisis basados en clústeres bayesianos, componentes principales (PCA) y análisis discriminante de componentes principales (DAPC) sugieren la posible presencia de dos clústeres diferenciados genéticamente, pero sin ninguna relación con las áreas geográficas. Los resultados del análisis de cuello de botella poblacional no son significativos con valores de tamaño efectivo poblacional (Ne) elevados y similares entre los dos clústeres. Por el contrario, en E. marginatus, los análisis basados en microsatélites no muestran ningún patrón de subdivisión genética. El valor de FST es bajo y no significativo (FST=0.008), el análisis Bayesiano indicia un solo clúster y el PCA determina que todas las muestras de las diferentes localidades geográficas comparten la misma estructura genética. El análisis de cuello de botella muestra diferencias significativas con la observación de una baja Ne. Los resultados de los análisis genéticos en estas dos especies a lo largo de la costa sudeste de Brasil sugieren diferentes estructuras genéticas para cada especie y estos resultados deben tenerse en consideración para la estipulación de las medidas de conservación de la diversidad genética.

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Publicado

2016-12-30

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Priolli RH, Bajay MM, Silvano RA, Begossi A. Estructura genética poblacional de dos especies piscícolas, una de estuario y una de arrecife, explotados por la pesca artesanal brasilera. Sci. mar. [Internet]. 30 de diciembre de 2016 [citado 23 de febrero de 2025];80(4):467-7. Disponible en: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1676

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