Breeding on the leading edge of a northward range expansion: differences in morphology and the stress response in the arctic Gambel’s white-crowned sparrow - Jesse S. Krause; Helen E. Chmura; Jonathan H. Pérez; Lisa N. Quach; Ashley Asmus; Karen R. Word; Michaela A. McGuigan; Shannan K. Sweet; Simone L. Meddle; Laura Gough; Natalie Boelman; John C. Wingfield (Oecologia, 2016)