The research group studies physiological adaptations to life at high
Our research is curiosity-driven and aims to understand the
Our methodology spans from state-of-the-art molecular techniques to
The research group is located in the Arctic Biology facility at the UiT campus, which includes offices, laboratories, animal rooms, workshops, store rooms and garages within 4 separate buildings totalling about 2 700 m2. The buildings are located within a fenced area of >50 000 m2 which also includes pens for holding experimental animals. The Norwegian Food Safety Authority has approved the research animal facility for the maintenance of arctic mammals and birds (reindeer, seals, ptarmigan) and hibernation facilities for golden hamsters. The group also operates a field station on Ryøy, ~20 km outside Tromsø, and in Adventdalen on the high-arctic archipelago of Svalbard.
Recently we modernised our ptarmigan facility, surgery suite and molecular biology laboratories. We also have access the Marine Research Laboratory in Kårvika for our fish work and R/V Helmer Hanssen for our seal research.
Evolution of seasonal adaptations in voles - a physiological and genetic approach
Can baleen whales be safely live-captured for studies of their physiology?
Nitrogen Excretion and Aspects of Water Balance in Fasting Hooded Seal Pups (Cystophora cristata)
Validating the Tritiated Water Method in Adult Harp Seal
Characterization of the biological clock in Svalbard ptarmigan (Lagopus muta hyperborea)
Munin has a full list of PhD and MScs completed.
If you want to join us for a masters project you can either register for the Arctic animal physiology masters program at UiT or if you are already on a MSc program at a different university you can register as an exchange student for the masters project: Exchange Masters project
You may also be able to start the project sooner than the application deadline listed under exchange student masters project, please contact us directly to find out.
Thyroid hormone regulation of mitochondrial activity in hibernation
Ever wonder how a hibernator re-warms itself? This project focuses on an endocrine tissue called brown fat which produces heat through uncoupled mitochrondria to re-warm the whole animal. In order to prepare for the hibernation season thyroid hormone levels in the brain are altered, this project will look at the effect of changing thyroid hormone levels in the brown adipose tissue on thermogenesis. The student will:
Contact David Hazlerigg or Shona Wood (David.hazlerigg@uit.no or shona.wood@uit.no )
Behavioural analysis of hibernating and non-hibernating strategies
Golden hamsters prepare for winter by lowering their body temperature to approximately 33C, some take this a step further initiating full hibernation by periodically lowering their body temperature to 8C! This project will compare the two winter strategies calculating activity, food intake and energy expenditure over the winter season. The student will:
Contact Shona Wood (shona.wood@uit.no )
Do ptarmigan use torpor (“hibernation”)?
Svalbard ptarmigan have remarkable adaptations to survive the arctic winter, increasing fat stores and plumage to maintain body temperature. Torpor is a state metabolic rate suppression which leads to a regulated lowering of body temperature, multiple species of bird use torpor to save energy. The aim of this project is to determine whether the Svalbard ptarmigan employs this strategy. The student will:
Contact Shona Wood (shona.wood@uit.no )
Testing the endogenous basis of semi-lunar rhythms in Rainbow Trout growth and behaviour
Several labs have now isolated the molecular underpinning of lunar clocks in invertebrates, however, despite many descriptive reports, whether the lunar phase entrains timing mechanisms in vertebrates remains a mystery. Building on classical studies in rainbow trout, we will test entrainment of semi-lunar growth patterns in a lab setting and determine if they are a passive consequence of lunar light in the environment, or driven by an internal timer. This project requires a motivated student who will:
Recommended reading:
Kaiser T and Neumann J (2021) Circalunar clocks—Old experiments for a new era. Bioessays. 2021;43:2100074. doi: 10.1002/bies.202100074
Supplementary methods from - Audira G et al., (2019) Establishing simple image-based methods and a cost-effective instrument for toxicity assessment on circadian rhythm dysregulation in fish. Biology Open. 8, bio041871. doi:10.1242/bio.041871
Contact Alex West (alexander.c.west@uit.no )
Is adaptive fat metabolism important for Svalbard Ptarmigan hydration during freezing Arctic winters?
Svalbard ptarmigan undergo a huge seasonal change in body mass. Regulation of body mass in Svalbard Ptarmigan is dependent on seasonal photoperiod, but also temperature – cold exposed ptarmigan lose mass through the winter, whereas ptarmigan kept above freezing temperatures maintain a high body mass until spring. As both groups of ptarmigan are well within their thermoneutral zone this difference in body mass is not simply the consequence of higher energy expenditure under a larger thermal gradient. Instead, we hypothesise that body mass decline in cold exposed birds reflects a changing metabolic program that minimizes energy required to absorb liquid water. Rather than eat snow, which must then be melted and warmed to body temperature – a costly process, cold-exposed birds adopt an energetically more favourable strategy that liberates metabolic water from stored fat. To test this hypothesis we will characterize the metabolic program and water turnover in Svalbard ptarmigan exposed to cold and non-freezing temperatures. To achieve this the student will:
Recommended reading:
Stokkan K. et al (1995) Photoperiodic and ambient temperature control of the annual body mass cycle in Svalbard ptarmigan. Journal of Comparative Physiology B. doi: 10.1007/BF00387306
Riek A et al., (2021) Daily energy expenditure and water turnover in two breeds of laying hens kept in floor housing. Animal. Vol15(1), 100047. doi: 10.1016/j.animal.2020.100047
Contact Alex West (alexander.c.west@uit.no )
Overwintering strategies and activity rhythms in a living fossil
The living fossil lepidurus arcticus is found in ephemeral pools and permanent freshwater lakes on Svalbard. There are two potential avenues of research:
At present, we don't know if L. arcticus responds to photoperiod, if it has a biological clock and if it has a rhythmic expression of the clock genes. Knowledge of life cycle can be useful for understand the biological rhythms in this and other high arctic species. Moreover, climate change studies predict a special effect in high-latitude lakes (Giorgi et al., 1997), which includes longer ice-free periods. Changes in the length of the ice-free period may have differential effects on the development of species, altering the zooplankton community structure.
The student will:
Contact David Hazlerigg or Shona Wood (David.hazlerigg@uit.no or shona.wood@uit.no )
Clocks and chronotypes of wild Arctic songbirds
We have opportunities to study circadian clocks, daily rhythms and chronotypes of wild free-living songbirds (great tits, blue tits, willow tits or pied flycatchers). Students may develop their own research projects and are welcome to contact Barbara to discuss their ideas. Depending on the season, topics can range from: a) basic characterization of rhythms of individually marked birds in the field (especially during the polar night and midnight sun); b) studying how activity patterns relate to reproductive success and survival; c) impacts of artificial light at night on daily/seasonal rhythms; d) studying the circadian clock of songbirds during the polar night and midnight sun; e) other studies involving behavioural tests (personality, cognition) may also be possible depending on the season.
The student will:
Contact Barbara Tomotani (barbara.m.tomotani@uit.no )
The research group offers research-based teaching in general and comparative physiology, both at the Bachelor, Master and PhD levels.
Courses and teaching activities:
Publications
Popular science articles of our research
Endurance physiology in Huskys (in Norwegian)
European research council funded hibernation project (in Norwegian)
Peer-reviewed articles
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