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):

  1. Bandara K, Varpe Ø, Ji R, Eiane K. 2018. A high-resolution modeling study on diel and seasonal vertical migrations of high-latitude copepods. Ecological Modelling 368: 357-376 full text
  2. Varpe Ø. 2017. Life History Adaptations to Seasonality. Integrative & Comparative Biology 57: 943-960 full text
  3. Williams CM, Ragland GJ, Betini G, Buckley LB, Cheviron ZA, Donohue K, Hereford J, Humphries MM, Lisovski S, Marshall KE, Schmidt PS, Sheldon KS, Varpe Ø, Visser ME. 2017. Understanding Evolutionary Impacts of Seasonality: An Introduction to the Symposium. Integrative & Comparative Biology 57: 921-933 full text
  4. Espinasse M, Halsband C, Varpe Ø, Gislason A, Gudmundsson K, Falk-Petersen S, Eiane K. 2017. The role of local and regional environmental factors for Calanus finmarchicus and C. hyperboreus abundances in the Nordic Seas. Polar Biology 40: 2363-2380 abstract
  5. Langbehn TJ, Varpe Ø. 2017. Sea-ice loss boosts visual search: fish foraging and changing pelagic interactions in polar oceans. Global Change Biology 23: 5318-5330 fullt text
  6. Fauchald P, Tarroux A, Tveraa T, Cherel Y, Ropert-Coudert Y, Kato A, Love OP, Varpe Ø, Descamps S. 2017. Spring phenology shapes the spatial foraging behavior of Antarctic petrels. Marine Ecology Progress Series 568: 203-215 abstract pdf
  7. Hitchcock D, Varpe Ø, Andersen T, Borgå K. 2017. Effects of reproductive strategies on pollutant concentrations in pinnipeds: a meta-analysis. Oikos doi:10.1111/oik.03955  abstract
  8. Beumer LT, Varpe Ø, Hansen BB. 2017. Cratering behaviour and faecal C:N ratio in relation to seasonal snow-pack characteristics in a high-Arctic ungulate. Polar Research 36: 1 1286121  full text
  9. Descamps S, Tarroux A, Cherel Y, Delord K, Godø OR, Kato A, Krafft BA, Lorentsen SH, Ropert-Coudert Y, Skaret G, Varpe Ø. 2016. At-sea distribution and prey selection of Antarctic petrels and commercial krill fisheries. PLOS ONE 11(8): e0156968  full text
  10. Bandara K, Varpe Ø, Søreide JE, Wallenschus J, Berge J, Eiane K. 2016. Seasonal vertical strategies in a high Arctic coastal zooplankton community. Marine Ecology Progress Series 555: 49-64  full text
  11. Wauchope HS, Shaw JD, Varpe Ø, Lappo EG, Boertmann D, Lanctot RB, Fuller RA. 2016. Rapid climate-driven loss of breeding habitat for Arctic migratory birds. Global Change Biology 23: 1085-1094 doi: 10.1111/gcb.13404  abstract
  12. Burr ZM, Varpe Ø, Anker-Nilssen T, Erikstad KE, Descamps S, Barrett RT, Bech C, Christensen-Dalsgaard S, Lorentsen SH, Moe B, Reiertsen TK, Strøm H. 2016. Later at higher latitudes: large-scale variability in seabird breeding timing and synchronicity. Ecosphere 7(5): e01283  full text
  13. Milner J, Varpe Ø, Van der Wal R, Hansen BB. 2016. Experimental icing affects growth, mortality and flowering in a high Arctic dwarf shrub. Ecology and Evolution 6: 2139–2148  full text
  14. Jin M, Popova EE, Zhang J, Ji R, Pendleton D, Varpe Ø, Yool A, Lee YL. 2016. Ecosystem model intercomparison of under-ice and total primary production in the Arctic Ocean. Journal of Geophysical Research: Oceans 121: 934–948  abstract
  15. Tarroux A, Weimerskirch H, Wang S, Bromwich DH, Cherel Y, Kato A, Ropert-Coudert Y, Varpe Ø, Yoccoz NG, Descamps S. 2016. Flexible flight response to challenging wind conditions in a commuting Antarctic seabird: do you catch the drift? Animal Behaviour 113: 99-112  abstract
  16. Descamps S, Tarroux A, Lorentsen SH, Love OP, Varpe Ø, Yoccoz NG. 2016. Large-scale oceanographic fluctuations drive Antarctic petrel survival and reproduction. Ecography 39: 496-505  abstract
  17. Berge J, Daase M, Renaud P, Ambrose WG, Darnis G, Last KS, Leu E, Cohen J, Johnsen G, Moline M, Varpe Ø, Shunatova N, et al. 2015. Unexpected levels of biological activity during the polar night offer new perspectives on a warming Arctic. Current Biology 25: 2555-2561  abstract
  18. Varpe Ø, Daase M, Kristiansen T. 2015. A fish-eye view on the new Arctic lightscape. ICES Journal of Marine Science 72: 2532-2538  abstract   pdf
  19. Cohen JH, Berge J, Moline MA, Sørensen AJ, Last K, Falk-Petersen S, Renaud P, Leu E, Grenvald J, Cottier F, Cronin H, Menze S, Norgren P, Varpe Ø, Daase M, Darnis G, Johnsen G. 2015. Is ambient light during the high Arctic polar night sufficient to act as a visual cue for zooplankton? PLOS ONE 10(6): e0126247  abstract  pdf
  20. Ejsmond MJ, Varpe Ø, Czarnołęski M, Kozłowski J. 2015. Seasonality in offspring value and trade-offs with growth explain capital breeding. American Naturalist 186: E111-E125  abstract  press release
  21. Berge J, Renaud PE, Darnis G, Cottier F, Last K, Gabrielsen TM, Johnsen G, Seuthe L, Welsawski JM, Leu E, Moline M, Nahrgang J, Søreide JE, Varpe Ø, Lønne OJ, Daase JM, Falk-Petersen S. 2015. In the dark: a review of ecosystem processes during the Arctic polar night. Progress in Oceanography 139:258-271  abstract  pdf
  22. Descamps S, Tarroux A, Varpe Ø, Yoccoz N, Tveraa T, Lorentsen S. 2015. Demographic effects of extreme weather events: snow storms, breeding success and population growth rate in a long-lived Antarctic seabird. Ecology and Evolution 5: 314-325  abstract  pdf
  23. Webster CN, Varpe Ø, Stübner E, Falk-Petersen S, Berge J, Brierley AS 2015. Moonlit swimming: vertical distributions of macrozooplankton and nekton during the polar night. Polar Biology 38:75-85  abstract
  24. Grigor J, Marais AE, Falk-Petersen S, Varpe Ø. 2015. Polar night ecology of a pelagic predator, the chaetognath Parasagitta elegans. Polar Biology 38: 87-98  abstract
  25. Hansen BB, Isaksen K, Benestad RE, Kohler J, Pedersen ÅØ, Loe LE, Coulson SJ, Larsen JO, Varpe Ø. 2014. Warmer and wetter winters: characteristics and implications of an extreme weather event in the high arctic. Environmental Research Letters. 9 114021  abstract  pdf
  26. Jönsson M, Varpe Ø, Kozlowski T, Berge J, Kröger R. 2014. Differences in lens optical plasticity in two gadoid fishes meeting in the Arctic. Journal of Comparative Physiology A. 200: 949-957  abstract
  27. Sainmont J, Andersen KH, Varpe Ø, Visser AW. 2014. Capital versus income breeding in a seasonal environment. The American Naturalist. 184: 466-476  abstract
  28. Berge J, Cottier F, Varpe Ø, Renaud PE, Falk-Petersen S, Kwasniewski S, Griffiths C, Søreide J, G Johnsen, Aubert A, Bjærke O, Hovinen J, Juul-Madsen S, Tveit M, Majaneva S. 2014. Arctic complexity: a case study on diel vertical migration of zooplankton. Journal of Plankton Research. 36: 1279-1297  abstract  pdf
  29. Sainmont J, Gislason A, Heuschele J, Webster C, Sylvander P, Wang M, Varpe Ø. 2014. Inter and intra-specific diurnal habitat selection of zooplankton during the spring bloom observed by video plankton recorder. Marine Biology 161: 1931-1941  abstract
  30. Nahrgang J, Varpe Ø, Korshunova E, Murzina S, Hallanger IG, Vieweg I, Berge J. 2014. Gender specific reproductive strategies of an Arctic key species (Boreogadus saida) and implications of climate change. PLOS ONE 9: e98452  abstract  pdf
  31. Grigor J, Søreide JE, Varpe Ø. 2014. Seasonal ecology and life history of the high-latitude predatory zooplankter Parasagitta elegans. Marine Ecology Progress Series 499: 77-88  abstract  pdf   online appendix
  32. Lydersen C, Assmy P, Falk-Petersen S, Kohler J, Kovacs KM, Reigstad M, Steen H, Strøm H, Sundfjord A, Varpe Ø, Walczowski A, Weslawski JM, Zajaczkowski M 2014. The importance of tidewater glaciers for marine mammals and seabirds in Svalbard, Norway. Journal of Marine Systems 129: 452-471  abstract   pdf
  33. Daase M, Varpe Ø, Falk-Pedersen S. 2014. Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter. Journal of Plankton Research 36: 129-144  abstract
  34. Daase M, Falk-Petersen S, Varpe Ø, Darnis G, Søreide JE, Wold A, Leu E, Berge J, Philippe B, Fortier L. 2013. Timing of reproductive events in the marine copepod Calanus glacialis: a Pan-Arctic perspective. Canadian Journal of Fisheries and Aquatic Sciences 70: 871-884  abstract
  35. Ji R, Jin M, Varpe Ø. 2013. Sea ice phenology and timing of primary production pulses in the Arctic Ocean. Global Change Biology 19: 734-741  abstract   pdf
  36. Kraft A, Berge J, Varpe Ø, Falk-Petersen S. 2013. Feeding in Arctic darkness: mid-winter diet of the pelagic amphipods Themisto abyssorum and T. libellula. Marine Biology 160: 241-248  abstract
  37. Berge J, Varpe Ø, Moline M, Wold A, Renaud PE, Daase M, Falk-Petersen S. 2012. Retention of ice-associated amphipods: possible consequences for an ice-free Arctic Ocean. Biology Letters. 8: 1012-101  pdf
  38. Welcker J, Beiersdorf A, Varpe Ø, Steen H. 2012. Mass fluctuations suggest different functions of bimodal foraging trips in a central place forager. Behavioral Ecology. 23: 1372-1378  abstract   pdf
  39. Gabrielsen TM, Merkel B, Søreide JE, Johansson-Karlsson E, Bailey J, Vogedes D, Nygård H, Varpe Ø, Berge J. 2012. Potential misidentifications of two climate indicator species of the marine arctic ecosystem: Calanus glacialis and C. finmarchicus. Polar Biology 35: 1621-1628  pdf
  40. Varpe Ø. 2012. Fitness and phenology: annual routines and zooplankton adaptations to seasonal cycles. Journal of Plankton Research 34: 267-276  pdf
  41. Renaud PE, Berge J, Varpe Ø, Lønne OJ, Nahrgang J, Ottesen C, Hallanger I. 2012. Is the poleward expansion by Atlantic cod and haddock threatening native polar cod, Boreogadus saida? Polar Biology. 35: 401-412  abstract
  42. Enberg K, Jørgensen C, Dunlop ES, Varpe Ø, Boukal DS, Baulier L, Eliassen S, Heino M. 2012. Fishing-induced evolution of growth: concepts, mechanisms, and the empirical evidence. Marine Ecology. 33: 1-25  pdf  most read 2012
  43. Nygård H, Wallenschus J, Camus L, Varpe Ø, Berge J. 2010. Annual routines and life history of the amphipod Onisimus litoralis: seasonal growth, body composition and energy budget. Marine Ecology Progress Series. 417: 115-126.  pdf
  44. Varpe Ø, Fiksen Ø. 2010. Seasonal plankton-fish interactions: light regime, prey phenology, and herring foraging. Ecology. 91: 311-318  pdf
  45. Vogedes D, Varpe Ø, Søreide JE, Graeve M, Berge J, Falk-Petersen S. 2010. Lipid sac area as a proxy for individual lipid content of arctic calanoid copepods. Journal of Plankton Research 32: 1471-1477  pdf  cover photo
  46. Varpe Ø. 2010. Stealing bivalves from common eiders: kleptoparasitism by glaucous gulls in spring. Polar Biology. 33: 359-365  pdf  online appendix
  47. Hanssen SA, Bustnes JO, Tveraa T, Hasselquist D, Varpe Ø, Henden JA. 2009. Individual quality and reproductive effort mirrored in white wing plumage in both sexes of south polar skuas. Behavioral Ecology. 20: 961-966  pdf
  48. Berge J, Renaud PE, Eiane K, Gulliksen B, Cottier FR, Varpe Ø, Brattegard T. 2009. Changes in the decapod fauna of an Arctic fjord during the last 100 years (1908-2007). Polar Biology 32: 953-961  pdf
  49. Varpe Ø, Jørgensen C, Tarling GA, Fiksen Ø. 2009. The adaptive value of energy storage and capital breeding in seasonal environments. Oikos 118: 363-370  pdf
  50. Berge J, Cottier F, Last K, Varpe Ø, Leu E, Søreide J, Eiane K, Falk-Petersen S, Willis K, Nygård H, Vogedes D, Griffiths C, Johnsen G, Lorentzen D, Brierley AS. 2009. Diel vertical migration of Arctic zooplankton during the polar night. Biology Letters 5: 69-72  pdf
  51. Heino M, Baulier L, Boukal DS, Dunlop ES, Eliassen S, Enberg K, Jørgensen C, Varpe Ø. 2008. Evolution of growth in Gulf of St Lawrence cod? Proceedings of the Royal Society B-Biological Sciences 275: 1111-1112  pdf
  52. Titelman J, Varpe Ø, Eliassen S, Fiksen Ø. 2007. Copepod mating: chance or choice? Journal of Plankton Research 29: 1023-1030  pdf
  53. Varpe Ø, Jørgensen C, Tarling GA, Fiksen Ø. 2007. Early is better: seasonal egg fitness and timing of reproduction in a zooplankton life-history model. Oikos 116: 1331-1342  pdf   online appendix
  54. Bustnes JO, Tveraa T, Varpe Ø, Henden JA, Skaare JU, 2007. Reproductive performance and organochlorine pollutants in an Antarctic marine top predator: the south polar skua. Environment International 33: 911-918  pdf
  55. Bustnes JO, Tveraa T, Henden JA, Varpe Ø, Janssen K, Skaare JU. 2006. Organochlorines in Antarctic and Arctic avian top predators: a comparison between the South Polar Skua and two species of northern hemisphere gulls. Environmental Science & Technology 40: 2826-2831  pdf
  56. Varpe Ø, Fiksen Ø, Slotte A. 2005. Meta-ecosystems and biological energy transport from ocean to coast: the ecological importance of herring migration. Oecologia 146: 443-451  pdf
  57. Varpe Ø, Tveraa T 2005. Chick survival in relation to nest site: is the Antarctic petrel hiding from its predator? Polar Biology 28: 388-394  pdf
  58. Varpe Ø, Tveraa T, Folstad I. 2004. State-dependent parental care in the Antarctic petrel: responses to manipulated chick age during early chick rearing. Oikos 106 (3) 479-488  pdf
  59. Fiksen Ø, Varpe Ø, Kaartvedt S. 2004. Reply to Horizons Article ‘Some ideas about the role of lipids in the life cycle of Calanus finmarchicus’ Irigoien (2004): II. Journal of Plankton Research 26: 980  pdf

Selected other publications:

  • Burr Z, Varpe Ø. 2016. Seabird breeding timing at high latitudes. FRAM FORUM 2016. 18-21. full text
  • Hansen BB, Isaksen K, Loe LL, Haugen JE, Benestad R, Milner J, van der Wal R, Varpe Ø. 2015. Varmere og våtere svalbardvintre: konsekvenser for natur og samfunn. METreport No. 20/2015. ISSN 2387-4201 pdf
  • Varpe Ø, Baardsen BJ. 2014. Adventdalsdeltaet og fjæreplyttens sesongmessige bruk av det marine habitat. Akvaplan-niva rapport nr 6280-1 pdf
  • Varpe, Ø. 2007. Life history adaptations to seasonality. PhD thesis. University of Bergen. synthesis popular abstract (in Norwegian)
  • Varpe Ø, Fiksen Ø. 2005. Zooplankton-fish interactions and the fat conveyor-belt in the Norwegian Sea. GLOBEC International Newsletter (11 No. 2) 4-6  pdf

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