Boundary between the north and south Atlantic populations of the swordfish (Xiphias gladius) inferred by a single nucleotide polymorphism at calmodulin gene intron

Global phylogeography of the dolphinfish (Coryphaena hippurus): The influence of large effective population size and recent dispersal on the divergence of a marine pelagic cosmopolitan species

“…Similar levels of population differentiation between populations, associated with spawning grounds, have been reported for the bluefin tuna (Carlsson et al, 2007), swordfish (Alvarado-Bremer et al, 2005a;Chow et al, 2007) and blue marlin (Buonaccorsi et al, 1999) but were also reported to be due to phylopatric behaviour in the blacktip shark Carcharhinus limbatus (Keneey and Heist, 2006). These observations point out the importance of spawning grounds and a phylopatric behaviour for genetic differentiation of populations because all of these species are capable of trans-oceanic migration.…”

Multi-Genetic Marker Approach and Spatio-Temporal Analysis Suggest There Is a Single Panmictic Population of Swordfish Xiphias gladius in the Indian Ocean

“…Examples of genetic sub-structure in cosmopolitan species include albacore tuna Thunnus alalunga [5] and at the intra-oceanic level, the blue marlin Makaira nigricans [6] or the white marlin Tetrapturus albidus [7]. Geographic partition was also shown in the most widely distributed species of pelagic fishes, the broadbill swordfish Xiphias gladius with two subdivisions in the Pacific Ocean (North-west versus South-East; [8]), as well as in the Atlantic Ocean (North-west versus South [9]), with a Mediterranean population clearly isolated from those of the Atlantic Ocean [10]. Furthermore, evidence of northwest and south Atlantic stocks of swordfish was supported by both parasite [11] and genetic data [9] strongly demonstrating that this species has the potential to evolve intra-ocean population sub-division.…”

Universal primers for exon-priming intron-crossing (EPIC) PCR on ribosomal protein genes in marine animals

“…Exon-primed intron-crossing (EPIC) polymerase chain reaction (PCR) has been developed and applied to find genetic polymorphisms in a wide variety of animals (Lessa 1992;Palumbi and Baker 1994;Corte-Real et al 1994;Daguin et al 2001;Chow and Takeyama 2000;Chow et al 2007). Primers designed to target conserved areas may have a wide utility across a broad range of animal taxa (Chow and Hazama 1998;Hassan et al 2002;Chow and Nakadate 2004;Pinho et al 2010;Jennings and Etter 2011).…”