Members

Here you can find a list of all ARCTOS members and PhD students. In the drop-down menu you can either select the member status or the institution the member belongs to.

A B C D E F G H I J K L M N O P R S T U V W Z
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Anna Vader

Researcher

Research interests:
  • Activity and biodiversity of arctic protists (mainly pico- and nano-eukaryotes)
  • Marine food chains (the use of molecular tools for prey studies of zooplankton)
  • RNA biology
Running national and international projects:
  • MicroFUN - Investigation of the the biodiversity and function of terrestrial and marine microbial eukaryotes in Svalbard
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UNIS – The University Centre in SvalbardArctic Biology Work address UNIS – The University Centre in Svalbard Post box 156 Longyearbyen 9171 Norway Work Phone: +47 79 02 33 59

Research interests:

  • Activity and biodiversity of arctic protists (mainly pico- and nano-eukaryotes)
  • Marine food chains (the use of molecular tools for prey studies of zooplankton)
  • RNA biology

Running national and international projects:

  • MicroFUN – Investigation of the the biodiversity and function of terrestrial and marine microbial eukaryotes in Svalbard

 

Photo of Øystein Varpe

Øystein Varpe

Professor (UNIS), Adjunct Senior Scientist (Akvaplan-niva)

Research interests:
  • Evolutionary and Seasonal Ecology
  • Main aim: understand why we observe variation in life histories and behavior and how this variation influences interactions, populations and ecosystems.
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UNIS The University Centre in SvalbardArctic Biology Address UNIS The University Centre in Svalbard Post box 156 Longyearbyen 9171 Norway Work Phone: + 47 79 02 64 63 Cell Phone: + 47 97 76 26 45 Website: Seasonal Ecology Group – Department of Arctic Biology – UNIS Website: UNIS – The University Centre in Svalbard – my main employer Website: Akvaplan-niva – adjunct position here

Research interests:

  • Evolutionary and Seasonal Ecology
  • Main aim: understand why we observe variation in life histories and behavior and how this variation influences interactions, populations and ecosystems.

I work in highly seasonal environments and study the scheduling of annual events and the trade-offs involved. Key traits: reproduction, energy storage, dormancy and migrations. What is the scope of state-dependent responses? What is the role of phenotypic plasticity versus evolution? Most of my work is on the ecology and evolution of birds, fish and zooplankton using mathematical models and statistical analyses of data. An important component of my work is to use the insights we gain to understand and predict how organisms respond to environmental variability and change, with pollution, harvesting and climate change as central stressors.

Student project opportunities:

If you find some of our research of interest and wish to do a student project (bachelor, master or PhD), please contact me for current opportunities or with own suggestions. Examples of past master students:

  • Marine Cusa (2016) The effect of seasonality on polar cod (Boreogadus saida) dietary habits and temporal feeding strategies in Svalbard waters.
  • Tom Jasper Langbehn (2015) Feeding success in an extreme-light environment: modelling seasonal prey encounter of Arctic fish.
  • Caitlin Frankish (2015) A meta-ecosystem model: seabirds as vectors
  • Samuel Louis Eglund Newby (2015) Feeding activity and diet of Arctic and boreal fish species during the polar night
  • Zofia Burr (2014) Breeding later at higher latitudes: explaining seabird reproductive timing in the northeastern Atlantic.
  • Jordan Grigor (2011) An investigation into strategies of protandrous emergence and arrival in Calanus spp.
  • Beke Regelin (2011) Purple sandpipers (Calidris maritima) feeding in an Arctic estuary: tidal cycle and seasonal dynamics in abundance.
  • Allison Bailey (2010) Lipids and diapause in Calanus spp. in a high-Arctic fjord: state-dependent strategies?
  • Anika Beiersdorf (2009) Foraging trip duration in relation to body mass: are little auks heavier following longer or shorter trips?

Please also visit the Seasonal Ecology Group – an umbrella for my work and supervision.

Running national and international projects (some expamples):

  • SEATIME – Timing of reproduction in seabirds: large-scale comparisons, and links to population dynamics, climate and lower trophic levels. (Fram Centre Flagship Project).
  • Numerical competence and student-active research (Thon stiftelsen)
  • Stochastic fluctuations and the evolution of zooplankton life histories in high latitude marine ecosystems (Polish Research Council)

Peer reviewed publications (see also Google Scholar or ResearchGate):

Selected popular science and outreach:

Links:

Fulbright Arctic Initiative Scholar 2015-2016

Video of talk on ecological consequences of sea ice changes in the Arctic.

View from the roof of my office: camera

Favourite mainland retreat – Bremanger: you-tube movie

Photo of Ireen Vieweg

Ireen Vieweg

Post-doctoral researcher

Research interests:
  • Marine Ecotoxicology in Polar regions
  • Polar cod ecology
  • Fish physiology.
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UiT The Arctic University of NorwayArctic and Marine Biology Work address Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Tromsø 9037 Norway Work Phone: +47 77 62 33 01

Research interests:

  • Marine Ecotoxicology in Polar regions
  • Polar cod ecology
  • Fish physiology.

With my research, I would like to provide new knowledge on how anthropogenic activity in Arctic regions affect the fitness and survival of key species in this pristine marine ecosystem. Hence, my research combines the study of basic ecological traits of marine organisms with the performance of exposure experiments in order to evaluate the threat of contamination for marine organisms in the Arctic. As key species in the Arctic marine ecosystem, polar cod has been the focal species of my research during the last years. In my PhD thesis, I investigated the biological effects of crude oil on essential physiological processes related to the fitness of polar cod. This work was part of the project POLARISATION (Norwegian Research Council # 214184, http://site.uit.no/polarisation/) and supervised by Jasmine Nahrgang.

Scientific publications:

  1. Vieweg, I., Benedetti, M., Lanzoni, I., Regoli, F., Nahrgang, J. (2017). Antioxidant defenses in polar cod (Boreogadus saida) and responsiveness toward dietary crude oil exposure. Marine Environmental Research 130: 48-59. doi: 10.1016/j.marenvres.2017.06.005.
  2. Bender, M.L., Frantzen, M., Vieweg, I., Falk- Petersen, I.B., Johnsen, H.K., Rudolfsen, G., Tollefsen, K.E. Dubourg, P., Nahrgang, J. (2016). Effects of chronic dietary petroleum exposure on reproductive development in polar cod (Boreogadus saida). Aquatic Toxicology 180, 196-208. doi: 10.1016/j.aquatox.2016.10.005.
  3. Nahrgang, J. M., Varpe, Ø, Korshunova, E., Murzina, S., Hallanger, I.G., Vieweg, I., Berge, J. (2014). Gender specific reproductive strategies of an Arctic key species (Boreogadus saida) and implication of climate change. PLOS ONE 9 (5), 1-11, doi: 10.1371/journal.pone.0098452.
  4. Vieweg, I., Hop, H., Brey, T., Huber, S., Ambrose, W.G., Locke, W.L.V., Gabrielsen, G.W. (2012).Persistent organic pollutants in four bivalve species from Svalbard waters. Environmental Pollution. 161: 134 – 142. doi: 10.1016/j.envpol.2011.10.018.

Popular science and outreach:

Photo of Daniel Ludwig Vogedes

Daniel Ludwig Vogedes

Technician

Research interests:
  • Zooplankton ecology
  • Polar Night biology
  • Underwater observatories.
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UiT The Arctic University of NorwayArctic and Marine Biology Work address Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Tromsø 9037 Norway Work Phone: +47 77 64 91 71 Website: Marine Night project

Research interests:

  • Zooplankton ecology
  • Polar Night biology
  • Underwater observatories.

Running national and international projects:

Contributing logistical support to:

Completed national and international projects:

Contributed logistical support to:

Relevant scientific publications:

  1. Berge, Jørgen; Daase, Malin; Renaud, Paul; Ambrose, William G. Jr.; Darnis, Gérald; Last, Kim S; Leu, Eva; Cohen, Jonathan H.; Johnsen, Geir; Moline, Mark A.; Cottier, Finlo; Varpe, Øystein; Shunatova, Natalia; Balazy, Piotr; Morata, Nathalie; Massabuau, Jean Charles; Falk-Petersen, Stig; Kosobokova, Ksenia; Hoppe, Clara JM; Weslawski, Jan Marcin; Kuklinski, Piotr; Legezynska, Joanna; Nikishina, Daria; Cusa, Marine; Kedra, Monika; Wlodarska-Kowalczuk, Maria; Vogedes, Daniel Ludwig; Camus, Lionel; Tran, Damien; Michaud, Emma; Gabrielsen, Tove M.; Granovitch, Andrei; Gonchar, Anya; Krapp, Rupert; Callesen, Trine A. Unexpected Levels of Biological Activity during the Polar Night Offer New Perspectives on a Warming Arctic. Current Biology 2015 ;Volume 25. p. 1-7 doi:10.1016/j.cub.2015.08.024
  2. Vogedes, Daniel Ludwig. Calanus spp. in the Arctic ecosystem: A story on predation, distribution and methodology. 2014. PhD thesis. http://munin.uit.no/handle/10037/6807
  3. Vogedes, Daniel Ludwig; Eiane, Ketil; Båtnes, Anna Solvang; Berge, Jørgen. Variability in Calanus spp. abundance on fine- to mesoscales in an Arctic fjord: implications for little auk feeding. Marine Biology Research 2014; Volum 10 (5). ISSN 1745-1000.s 437 – 448.s doi: 10.1080/17451000.2013.815781.
  4. Gabrielsen, Tove M; Merkel, Benjamin; Søreide, Janne; Johansson-Karlsson, Emma; Bailey, Allison; Vogedes, Daniel Ludwig; Nygård, Henrik Andreas; Varpe, Øystein; Berge, Jørgen. Potential misidentifications of two climate indicator species of the marine arctic ecosystem: Calanus glacialis and C. finmarchicus. Polar Biology 2012; Volum 35 (11). ISSN 0722-4060.s 1621 – 1628.s doi: 10.1007/s00300-012-1202-7.
  5. Vogedes, Daniel; Varpe, Øystein; Søreide, Janne; Graeve, M; Berge, Jørgen; Falk-Petersen, Stig. Lipid sac area as a proxy for individual lipid content of arctic calanoid copepods. Journal of Plankton Research 2010; Volum 32 (10). ISSN 0142-7873.s 1471 – 1477.s doi: 10.1093/plankt/fbq068.
  6. Berge, Jørgen; Cottier, Finlo; Last, Kim S.; Varpe, Øystein; Leu, Eva; Søreide, Janne; Eiane, Ketil; Falk-Petersen, S.; Willis, Kate; Nygård, Henrik; Vogedes, Daniel; Griffiths, Collin; Johnsen, Geir; Lorentzen, Dag Arne; Brierley, A.S.. Diel vertical migration of Arctic zooplankton during the polar night. Biology Letters 2009; Volum 5 (1). ISSN 1744-9561.s 69 – 72.s doi: 10.1098/rsbl.2008.0484.
  7. Daase, Malin; Eiane, Ketil; Aksnes, D.L.; Vogedes, Daniel. Vertical distribution of Calanus spp. and Metridia longa at four Arctic locations. Marine Biology Research 2008; Volum 4 (3). ISSN 1745-1000.s 193 – 207.s doi: 10.1080/17451000801907948.
  8. Steen, H.; Vogedes, Daniel; Broms, F.; Falk-Petersen, S.; Berge, Jørgen. Little auks (Alle alle) breeding in a High Arctic fjord system: bimodal foraging strategies as a response to poor food quality?. Polar Research 2007; Volum 26 (2). ISSN 0800-0395.s 118 – 125.s doi: 10.1111/j.1751-8369.2007.00022.x.

Popular science and outreach:

 

Photo of Tobias Vonnahme

Tobias Vonnahme

PhD candidate

PhD project title: Microbial carbon cycling in the seasonal ice zone: linking observations and experiments to dynamic modelling Project description: The carbon cycle in the seasonal ice zone is highly dynamic over the year and and in a changing climate.…Read More
UiT The Arctic University of NorwayArctic and Marine Biology Work address Department of Arctic and Marine Biology Faculty of Biosciences, Fisheries and Economics UiT The Arctic University of Norway Tromsø 9037 Norway Work Phone: +47 77 64 48 28 Website: UiT profile Website: Arctic SIZE project Website: google scholar profile

PhD project title:

Microbial carbon cycling in the seasonal ice zone: linking observations and experiments to dynamic modelling

Project description:

The carbon cycle in the seasonal ice zone is highly dynamic over the year and and in a changing climate. Light limitations in the polar night, ice formation and melt, and nutrient limitations are some of these dynamic factors. Dynamic ecosystem models are still neglecting these dynamics and the physiological mechanisms of algae and bacteria to deal with it. The aim of my PhD is to study Three important processes in the microbial carbon cycle in the seasonal ice zone which are poorly characterized in current ecosystem models; 1) heterotrophic carbon uptake in microalgae as response to light and nutrient limitation, also as potential survial strategy in the polar night; 2) The role of bacteria as competitors or commensalists via nutrient recycling under different light and nutrient conditions; 3) The role of tidewater outlet glaciers on microbial communities and their function in the ecosystem.  I will quantify the role of the Three processes in the carbon cycle and show their importance in dynamic ecosystem models. The results will help to understand the importance of key processs and to improve predictions on the effect of climate change on the  carbon cycle.

Start date: March 2017
Planned submission date: March 2020

Supervisors:

Rolf Gradinger (UiT – The Arctic University of Norway, Tromsø, Norway)

Dick van Oevelen (NIOZ – Royal Netherlands Institute for Sea Research, Netherlands)

Tron Frede Thingstad (UiB – The University of Bergen, Norway),

Geir Johnsen (NTNU – Norwegian University of Science and Technology, Trondheim, Norway)

Relevant scientific publications:

  1. Vonnahme, T. R., Devetter, M., Žárský, J. D., Šabacká, M., & Elster, J. (2016). Controls on microalgal community structures in cryoconite holes upon high-Arctic glaciers, Svalbard. Biogeosciences, 13(3), 659-674. doi:10.5194/bg-13-659-2016
  2. Zawierucha, K., Ostrowska, M., Vonnahme, T.R., Devetter, A.M., Nawrot, P., Lehmann, S., Kolicka, M. (2016). Diversity and distribution of Tardigrada in Arctic cryoconite holes, Journal of Limnology. doi: 10.4081/jlimnol.2016.1453
  3. Zawierucha, K., Vonnahme, T.R., Devetter, M., Kolicka, M., Ostrowska, M., Chmielewski, S., Kosicki, J.Z. (2016). Area, depth and elevation of cryoconite holes in the Arctic do not influence Tardigrada densities, Polish Polar Research, 37(2), 325-334. doi: 10.1515/popore-2016-0009l
  4. Vonnahme, T. (2014). Microbial community structure in cryoconite holes in high Arctic glaciers on Svalbard, Bachelor thesis
  5. Vonnahme, T.R. (2016). Microbial diversity and function of deep sea manganese nodule ecosystems, Master thesis

Popular outreach (excl. conferences):

  • Arctic Frontiers 2018, Tromsø, Norway, Pecha Kucha Talk: Modelling climate change in the Arctic