title: Brünnich's guillemots (Uria lomvia) maintain high temperature in the body core during dives.
abstract: A major challenge for diving birds, reptiles, and mammals is regulating body temperature while conserving oxygen through a reduction in metabolic processes. To gain insight into how these needs are met, we measured dive depth and body temperatures at the core or periphery between the skin and abdominal muscles simultaneously in freely diving Brünnich's guillemots (Uria lomvia), an arctic seabird, using an implantable data logger (16-mm diameter, 50-mm length, 14-g mass, Little Leonardo Ltd., Tokyo). Guillemots exhibited increased body core temperatures, but decreased peripheral temperatures, during diving. Heat conservation within the body core appeared to result from the combined effect of peripheral vasoconstriction and a high wing beat frequency that generates heat. Conversely, the observed tissue hypothermia in the periphery should reduce metabolic processes as well as heat loss to the water. These physiological effects are likely one of the key physiological adaptations that makes guillemots to perform as an efficient predator in arctic waters.
authors.affiliation: Japan Society for the Promotion of Science, Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan. niizuma@ccmfs.meijo-u.ac.jp
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Niizuma
authors.forename: Geir W
authors.initials: GW
authors.lastname: Gabrielsen
authors.forename: Katsufumi
authors.initials: K
authors.lastname: Sato
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Watanuki
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Naito
mesh_terms: D000818:Animals; D001833:Body Temperature Regulation / Q000502:physiology*; D046091:Charadriiformes / Q000502:physiology*; D004242:Diving / Q000502:physiology*; D012146:Rest