The emergence of endothermy in the black-footed and Laysan albatrosses |
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Authors: | W. R. Dawson G. C. Whittow |
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Affiliation: | (1) Museum of Zoology, The University of Michigan, 48109 Ann Arbor, MI, USA;(2) Department of Biology, The University of Michigan, 48109 Ann Arbor, MI, USA;(3) Department of Physiology, John A. Burns School of Medicine, University of Hawaii, 96822 Honolulu, HI, USA |
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Abstract: | Eggs with pip-holes of the black-footed (Diomedea nigripes) and Laysan (Diomedea immutabilis) albatrosses were exposed to various air temperatures in the range 20–35°C in order to detect signs of incipient endothermy in late embryos. No evidence of endothermy was found. In contrast, the O2 consumption of most hatchlings increased in response to cooling, the O2 consumption at an air temperature of 25° C exceeding that between 34 and 35°C by 40%. In a minority of hatchlings this response was not seen. It was suggested that endothermy may develop at some time during the 24 h after hatching.Abbreviations bm body mass - Ctotal total thermal conductance of tissues and plumage - f respiratory frequency - FEO2 fractional concentration of oxygen in air leaving chamber - FIO2 fractional concentration of oxygen in air entering chamber - Ta an temperature - Tb deep-body temperature - V air-flow rate - VO2 oxygen consumption |
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Keywords: | Thermoregulation Endothermy Embryos Hatchlings Albatrosses, Diomedea |
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