GENETIC ANALYSIS OF BLUE MARLIN (MAkAIRA NIGRICANS) STOCk STRUCTURE IN THE ATLANTIC OCEAN

• Main Authors: Jan R Mcdowell, Jeanette E L Carlsson, John E Graves
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2007
• Subjects: North Atlantic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1047.8658; http://aquaticcommons.org/13500/1/McDowellCarlssonGraves_GCFI_Pelagics.pdf

ABSTRACT The genetic basis of stock structure of blue marlin (Makaira nigricans Lacepède 1802 ) in the Atlantic ocean was inferred from analyses of mitochondrial control region sequences. Blue marlin were collected in 1998 from 4 major geographic locations: western North Atlantic, Caribbean Sea, western South Atlantic and eastern Atlantic. Haplotype diversity (h) ranged from 0.99-1.0 and nucleotide sequence diversity (π) ranged from 0.11-0.13 within samples indicating that the control region harbors a significant amount of genetic variation. However, no significant differences were found in the spatial partitioning of genetic variation among the 4 collections; all pairwise φ ST values were negative and were therefore all taken as estimates around a true value of 0. As with previous studies of blue marlin, sequences were comprised of 2 distinct mitochondrial lineages separated by an average of 138 base pairs and φ ST between clades of 0.799 (P < 0.0001). These 2 lineages were present in similar frequencies across sampling locations. Genetic data from this study support management of Atlantic blue marlin as a single, Atlantic-wide stock. RESUMEN La base genética de la estructura de poblaciones del marlin azul (Makaira nigricans Lacepède 1802) en el Océano Atlántico fue inferido de analiza de sucesiones de región de control de mitochondrial (ADNm). El marlin azul fue reunido en 1998 de cuatro ubicaciones geográficas mayores: el norte occidental del Mar Atlántico, el Mar Caribe, el Atlántico Sur occidental y el Atlántico oriental. La diversidad de haplotipos (h) recorrió de 0,99-1,0, y la diversidad de la sucesión de nucleótido (π) recorrió de 0,11-0,13 dentro de las muestras, que indican que la región del control abriga una cantidad significativa de la variación genética. Sin embargo, ningunas diferencias significativas fueron encontradas en el dividir espacial de la variación genética entre las cuatro colecciones; todos valores de φ ST fueron negativos y fueron por lo tanto todo tomado como estimaciones ...