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Resumen del producto

Mamoozadeh, N.R., J.E., Graves, R., Bealey, J., Schratwieser, J.C., Holdsworth, S., Ortega-García & J.R., McDowell (2023). Genomic data resolve long-standing uncertainty by distinguishing white marlin (Kajikia albida) and striped marlin (K. audax) as separate species. ICES Journal of Marine Science. 80(6): 1802-1813. DOI: 10.1093/icesjms/fsad114.

Genomic data resolve long-standing uncertainty by distinguishing white marlin (Kajikia albida) and striped marlin (K. audax) as separate species

Nadia R. Mamoozadeh 1, John E. Graves 2, Roy Bealey 3, Jason Schratwieser 4, John C. Holdsworth 5, Sofía Ortega-García 6 y Jan R. McDowell 2

1 Michigan State University
2 Virginia Institute of Marine Science
3 Pelagic Fisheries Consulting
4 International Game Fish Association
5 Blue Water Marine Research
6 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas

Large pelagic fishes are often broadly distributed and capable of long-distance mo v ements. T hese f actors can promote gene flo w that mak es it difficult to disentangle intra- vs. inter-specific le v els of genetic differentiation. Here, we assess the relationship of two istiophorid billfishes, white marlin ( Kajikia albida ) and striped marlin ( K. audax ), presently considered sister species inhabiting separate ocean basins. P re vious studies report le v els of genetic differentiation between these species that are smaller than those observed among populations of other istiophorid species. To determine whether white marlin and striped marlin comprise separate species or populations of a single globally distributed species, we surv e y ed 2520 single nucleotide polymorphisms (SNPs) in 62 white marlin and 242 striped marlin across the Atlantic, Pacific, and Indian oceans. Multiv ariate analy ses resolv ed white marlin and striped marlin as distinct groups, and a species tree composed of separate lineages was strongly supported o v er a single lineage tree. Genetic differentiation between white marlin and striped marlin ( F ST = 0.5384) was also substantially larger than between populations of striped marlin ( F ST = 0.0192–0.0840), and we identified SNPs that allow unambiguous species identification. Our findings indicate that white marlin and striped marlin comprise separate species, which we estimate diverged at approximately 2.38 Mya.

Palabras clave: billfish; genomics; highly migratory species; species delimitation; Striped marlin; white marlin

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