Keeping time under the midnight sun: behavioral and plasma melatonin profiles of free-living Lapland longspurs (Calcarius lapponicus) during the arctic summer.

@article{Ashley2013KeepingTU,
  title={Keeping time under the midnight sun: behavioral and plasma melatonin profiles of free-living Lapland longspurs (Calcarius lapponicus) during the arctic summer.},
  author={Noah T. Ashley and Ingrid Schwabl and Wolfgang Goymann and C Loren Buck},
  journal={Journal of experimental zoology. Part A, Ecological genetics and physiology},
  year={2013},
  volume={319 1},
  pages={10-22}
}
Polar environments are characterized by discrete periods of continuous light or darkness during the summer and winter months, respectively. Because the light/dark cycle serves as the primary Zeitgeber to synchronize rhythms of most organisms, its seasonal absence in polar regions poses challenges to the circadian organization of organisms that reside in these environments. Although some species become arrhythmic, others, such as migratory songbirds, are able to maintain an intact diurnal rhythm… CONTINUE READING
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