“…Both mtDNA and nuclear markers often have concordant results in sedentary species ( Lavery, Moritz & Fielder, 1996 ; Avise, 2004 ; Zink & Barrowclough, 2008 ; DiBattista et al, 2015 ) but, when examined alone, may miss key components of population structure, particularly in migratory fauna ( Pardini et al, 2001 ; Bowen et al, 2005 ; Toews & Brelsford, 2012 ). When highly mobile elasmobranchs are examined with both mtDNA and nuclear markers (usually microsatellites), a different picture often emerges in which females are more resident and males are dispersive ( Pardini et al, 2001 ; Schultz et al, 2008 ; Portnoy et al, 2010 ; Karl et al, 2011 ; Daly-Engel et al, 2012 ; Portnoy et al, 2015 : Bernard et al, 2017 ; Domingues et al, 2018 ). Identifying outlier SNPs in the nuclear genome can highlight genes possibly under selection, or show functional responses to environmental changes that have important management consequences ( Jones et al, 2012 ; Fischer et al, 2013 ; Barrio et al, 2016 ; Guo, Li & Merilä, 2016 ).…”