Latitudinal and population specific differences in timing of daily and seasonal functions in redpolls (Acanthis flammea)

@article{Pohl1976LatitudinalAP,
  title={Latitudinal and population specific differences in timing of daily and seasonal functions in redpolls (Acanthis flammea)},
  author={H. Pohl and George C. West},
  journal={Oecologia},
  year={1976},
  volume={25},
  pages={211-227}
}
1. The daily (circadian) rhythm of activity and rest of common redpolls (Acanthis f. flammea L.) from 65°N lat. was measured for about one year in individuals outdoors at two latitudes (48° and 65°N). During winter at both latitudes, activity-time (α) of common redpolls approximated the duration of daylight (including civil twilights); onset of activity, however, occurred at lower light intensities than end of activity. During mid-summer, a rest-time (p) of ca. 5 h was maintained at both… CONTINUE READING

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