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First published online November 10, 2003

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The comparative energetics and growth strategies of sympatric Antarctic and subantarctic fur seal pups at Îles Crozet

J. P. Y. Arnould^1,*, S. P. Luque^2,3, C. Guinet², D. P. Costa⁴, J. Kingston⁵ and S. A. Shaffer⁴

¹ Department of Zoology, University of Melbourne, VIC 3010, Australia
² Centre d'Etudes Biologiques de Chizé, Centre National de la Recherche Scientifique, 79360 Villiers en Bois, France
³ Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada, A1B 3X9
⁴ Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060, USA
⁵ School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

View larger version (13K): [in a new window]   Fig. 1. The relationship between in-air resting metabolic rate (RMR) and body mass of Antarctic and subantarctic fur seal pups at Possession Island, les Crozet. The equation given is for Antarctic fur seal pups. No significant relationship was found for subantarctic fur seals.

View larger version (17K): [in a new window]   Fig. 2. The relationship between body mass and (A) total body water and (B) total body lipid in Antarctic (solid lines) and subantarctic (broken lines) fur seal pups at Possession Island, Iles Crozet. Regression statistics for both species in A: y=0.50x+0.70 (r2=0.93, P<0.0001) and y=0.55x-0.01 (r2=0.93, P<0.0001), respectively. Regression statistics for both species in B: y=0.32x-0.94 (r2=0.75, P<0.0001) and y=0.26x+0.02 (r2=0.63, P<0.0001), respectively.