Journal Article genomics marine mammal ADN mitocondrial ADN nuclear Arctic conservation Research Support, Non-U.S. Gov't bioenergetics capture-mark-recapture cetacean conservation conservation policy data synthesis deriva génica effective population size genetic differentiation genetic drift harvest heterocigosidad heterozygosity marcadores moleculares mitochondrial DNA molecular markers nuclear DNA photographic identification políticas de conservación predation range shifts síntesis de datos trophic cascades