Estimated feeding rates and energy requirements of gentoo penguins,Pygoscelis papua,at Macquarie Island |
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| Authors: | Graham Robertson Brian Green Keith Newgrain |
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| Institution: | (1) National Parks and Wildlife Service (NSW), c/o Division of Wildlife and Ecology, CSIRO, Box 84, 2602 Lyneham, ACT, Australia;(2) Division of Wildlife and Ecology, CSIRO, Box 84, 2602 Lyneham, ACT, Australia;(3) Present address: Antarctic Division, Department of Science, Channel Highway, 7050 Kingston, Tasmania, Australia |
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| Abstract: | Summary Water and sodium turnovers of 6–7 week old gentoo penguin chicks and breeding adults were measured using isotopically labelled water and sodium. Influx rates for chicks averaged 188 ml·kg-1·day-1 and 13.9 mmol·kg-1·day-1 for water and sodium, respectively. Chicks consumed an estimated 228 g·kg-1·day-1 fresh food or 886 kJ kg-1 day. These values correspond to 761 g·day-1 or 2945 kJ·day-1 for a gentoo chick mid-way through the growth period. Flux rates for adults attending chicks ranged from 199 to 428 ml·kg-1·day-1 for water and from 15 to 36 mmol·kg-1·ay-1 for sodium. |
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