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Circadian-based processes in the High Arctic: activity, thermoregulation and photoperiodism in the Svalbard ptarmigan (Lagopus muta hyperborea)
(Doctoral thesis; Doktorgradsavhandling, 2021-04-15)
<p>This thesis addresses aspects of the circadian and photoperiodic system in a High Arctic bird: the Svalbard ptarmigan (<i>Lagopus muta hyperborea</i>, Sundevall 1845). The most northern resident bird inhabits a unique photic environment; 2/3 of its year it spends either under a night without sunrise (polar night) or under a never setting Sun (polar day). Studies so far suggest a temporal loss of ...