Abstract
PENGUINS were chosen for this investigation because of their highly specialized adaptation to an aquatic life and because of the extreme physiological conditions they are subjected to during the breeding season. One of the most abundant species is the Adelie penguin, Pygoscelis adeliae, which has a circumpolar distribution south of the Antarctic pack-ice. Unlike other birds this species endures a prolonged fast averaging 6 weeks during incubation1 and another fast of shorter duration when it moults. At both times they may lose more than 40 per cent of their body-weight. Though flightless, their pectoralis muscles are well developed for extensive swimming and diving at sea.
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References
Sladen, W. J. L., Nature, 171, 952 (1953).
Sladen, W. J. L., Falkland Islands Dependencies Survey, Scientific Reports, No. 17 (H.M.S.O., London, 1958).
Markert, C. L., and Faulhaber, I., J. Exp. Zool., 159, 319 (1965).
Markert, C. L., in The Harvey Lectures, Series 59 (Academic Press, New York, 1965).
Kaplan, N. O., in Brookhaven Symposium in Biology, No. 17, 131 (1964).
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MARKERT, C., SLADEN, W. Stability of Lactate Dehydrogenase Isozyme Patterns in Penguins. Nature 210, 948–949 (1966). https://doi.org/10.1038/210948a0
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DOI: https://doi.org/10.1038/210948a0
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