Daniel Appenroth
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View article: Anesthetic and analgesic management of Svalbard rock ptarmigan (Lagopus muta hyperborea) undergoing experimental stereotaxic neurosurgery
Anesthetic and analgesic management of Svalbard rock ptarmigan (Lagopus muta hyperborea) undergoing experimental stereotaxic neurosurgery Open
Background Stereotaxic neurosurgery in animal models has become a prominent experimental technique in many areas of science and research. These approaches, however, require advanced surgical skills, meticulous anesthetic protocols, and tho…
View article: The Reindeer Circadian Clock Is Rhythmic and Temperature-compensated But Shows Evidence of Weak Coupling Between the Secondary and Core Molecular Clock Loops
The Reindeer Circadian Clock Is Rhythmic and Temperature-compensated But Shows Evidence of Weak Coupling Between the Secondary and Core Molecular Clock Loops Open
Circadian rhythms synchronize the internal physiology of animals allowing them to anticipate daily changes in their environment. Arctic habitats may diminish the selective advantages of circadian rhythmicity by relaxing daily rhythmic envi…
View article: The reindeer circadian clock is rhythmic and temperature-compensated but shows evidence of weak coupling between the secondary and core molecular clock loops
The reindeer circadian clock is rhythmic and temperature-compensated but shows evidence of weak coupling between the secondary and core molecular clock loops Open
Circadian rhythms synchronize the internal physiology of animals allowing them to anticipate daily changes in their environment. Arctic habitats may diminish the selective advantages of circadian rhythmicity by relaxing daily rhythmic envi…
View article: Biological timekeeping in polar environments: lessons from terrestrial vertebrates
Biological timekeeping in polar environments: lessons from terrestrial vertebrates Open
The polar regions receive less solar energy than anywhere else on Earth, with the greatest year-round variation in daily light exposure; this produces highly seasonal environments, with short summers and long, cold winters. Polar environme…
View article: Ambient Temperature Effects on the Spring and Autumn Somatic Growth Trajectory Show Plasticity in the Photoneuroendocrine Response Pathway in the Tundra Vole
Ambient Temperature Effects on the Spring and Autumn Somatic Growth Trajectory Show Plasticity in the Photoneuroendocrine Response Pathway in the Tundra Vole Open
Seasonal mammals register photoperiodic changes through the photoneuroendocrine system enabling them to time seasonal changes in growth, metabolism, and reproduction. To a varying extent, proximate environmental factors like ambient temper…
View article: Mechanisms of temperature modulation in mammalian seasonal timing
Mechanisms of temperature modulation in mammalian seasonal timing Open
Global warming is predicted to have major effects on the annual time windows during which species may successfully reproduce. At the organismal level, climatic shifts engage with the control mechanism for reproductive seasonality. In mamma…
View article: Circadian-based processes in the High Arctic: activity, thermoregulation and photoperiodism in the Svalbard ptarmigan (Lagopus muta hyperborea)
Circadian-based processes in the High Arctic: activity, thermoregulation and photoperiodism in the Svalbard ptarmigan (Lagopus muta hyperborea) Open
This thesis addresses aspects of the circadian and photoperiodic system in a High Arctic bird: the Svalbard ptarmigan (Lagopus muta hyperborea, Sundevall 1845). The most northern resident bird inhabits a unique photic environment; 2/3 of i…
View article: Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea)
Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea) Open
Organisms use circadian rhythms to anticipate and exploit daily environmental oscillations. While circadian rhythms are of clear importance for inhabitants of tropic and temperate latitudes, its role for permanent residents of the polar re…
View article: Replication Data for: Body temperature and activity rhythms under different photoperiods in Svalbard ptarmigan (Lagopus muta hyperborea)
Replication Data for: Body temperature and activity rhythms under different photoperiods in Svalbard ptarmigan (Lagopus muta hyperborea) Open
The following data was used to generate figures and analysis of the manuscript: "Body temperature and activity rhythms under different photoperiods in Svalbard ptarmigan (Lagopus muta hyperborea)". This includes data of core body temperatu…
View article: Adaptive value of circadian rhythms in High Arctic Svalbard ptarmigan
Adaptive value of circadian rhythms in High Arctic Svalbard ptarmigan Open
SUMMARY The arctic archipelago of Svalbard (74 to 81° North) experiences extended periods of uninterrupted daylight in summer and uninterrupted darkness in winter. Species native to Svalbard display no daily rhythms in behaviour or physiol…
View article: Replication Data for: Evidence for circadian-based photoperiodic timekeeping in the Svalbard ptarmigan, the northernmost resident bird.
Replication Data for: Evidence for circadian-based photoperiodic timekeeping in the Svalbard ptarmigan, the northernmost resident bird. Open
The following data was used to generate the figures of the manuscript: "Adaptive value of circadian rhythms in High Arctic Svalbard ptarmigan". This includes data from in situ hybridisation (measured in optical density), raw activity data …
View article: Photoperiodic induction without light-mediated circadian entrainment in a high arctic resident bird
Photoperiodic induction without light-mediated circadian entrainment in a high arctic resident bird Open
Organisms use changes in photoperiod to anticipate and exploit favourable conditions in a seasonal environment. While species living at temperate latitudes receive day length information as a year-round input, species living in the Arctic …
View article: Photoperiodic induction without light-mediated circadian entrainment in a high arctic resident bird
Photoperiodic induction without light-mediated circadian entrainment in a high arctic resident bird Open
Organisms use changes in photoperiod to anticipate and exploit favourable conditions in a seasonal environment. While species living at temperate latitudes receive day length information as a year-round input, species living in the Arctic …
View article: Core body temperature cycles in captive Svalbard rock ptarmigan (Lagopus muta hyperborea)
Core body temperature cycles in captive Svalbard rock ptarmigan (Lagopus muta hyperborea) Open
The Svalbard rock ptarmigan (Lagopus muta hyperborea) is an arctic animal and lives as such in constant light and constant darkness for parts of the year. They are therefore an interesting subject for chronobiologists and have been thoroug…