Muscle fiber size, myonuclear domain, and fat mass phenotypes in pre-migratory snow buntings

François Vézina, Ryan O'Connor, Audrey Le Pogam, Aliyah De Jesus, Oliver Love & Ana Jimenez
In long-distance migrants, preparation for migration is typically associated with increases in fat and body mass, and with an enlargement of pectoralis muscle mass that likely improves flight performance. Although changes in muscle mass or size have been well described in migratory birds, potential changes in muscle ultrastructure during this transition still deserves scrutiny. Using outdoor captive snow buntings (Plectrophenax nivalis n = 15) measured during their transition into a spring migratory phenotype as a...
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