Plasma melatonin in the Adelie penguin (Pygoscelis adeliae) under conditions daylight in Antarctica.

@article{Cockrem1991PlasmaMI,
  title={Plasma melatonin in the Adelie penguin (Pygoscelis adeliae) under conditions daylight in Antarctica.},
  author={John F. Cockrem},
  journal={Journal of pineal research},
  year={1991},
  volume={10 1},
  pages={
          2-8
        }
}
Circadian rhythms of melatonin secretion in birds are influenced by daylength and light intensity. Daily patterns of melatonin secretion were examined in Adelie penguins (Pygoscelis adeliae) under natural continuous daylight at Cape Bird, Antarctica (77 degrees S). Although daylight is continuous during the Antarctic summer there was a marked daily cycle of light intensity. However, there was no relationship between mean plasma melatonin levels and time of day in groups of 2-10 penguins sampled… CONTINUE READING
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