NBS cod northward movement
RAD libraries were prepared as described  in Drinan et al. 2018, Drinan DP, Gruenthal KM, Canino MF, Lowry D, Fisher  MC, Hauser L. 2018. Population assignment and local adaptation along an  isolationbydistance gradient in Pacific cod (Gadus macrocephalus).  Evolutionary Applications 11(8):1448-1464.