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.

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Peter Leopold

PhD candidate

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 09 29
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Eva Leu

Researcher

Research interests:
  • Climate impact on Arctic marine ecosystem productivity and structure
  • Ecophysiology and biochemistry of phytoplankton and ice algae
  • Food quality effects and trophic transfer of fatty acids
  • Light and UV radiation and primary producers.
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Akvaplan-nivaArctic R&D Work address Akvaplan-niva AS CIENS Gaustadalleen 21 Olso 0349 Work Phone: +47 948 49312

Research interests:

  • Climate impact on Arctic marine ecosystem productivity and structure
  • Ecophysiology and biochemistry of phytoplankton and ice algae
  • Food quality effects and trophic transfer of fatty acids
  • Light and UV radiation and primary producers.

Running national and international projects:

  • FAABulous: Future Arctic Algae Blooms (2015-2019)
  • Marine Night (2013-2016)
  • Arctic ABC (2015-2019)
  • PEACE: Pollution and ecosystem adaptation to changes in the environment (2015-2019)

Completed national and international projects:

  • CLEOPATRA II
  • CLEOPATRA: Climate effects on planktonic food quality and trophic transfer in Arctic marginal ice zones (2007-2009)
  • MERCLIM: Marine Ecosystems Response to a changing Climate

Curriculum Vitae: PDF

Relevant publications:

  1. Leu, E., Mundy, C.J., Campbell, K., Gabrielsen, T., Gosselin, M., Juul-Pedersen, T., Gradinger, R. (in press) Arctic spring awakening – steering principles behind the winter-spring transition in marine ecosystems. Prog Oceanogr
  2. Berge, J., Cottier, F. Darnis, G., Falk-Petersen, S., Gabrielsen, T., Johnsen, G., Last, K. ,Leu, E., Lønne, O.J., Moline, M., Nahrgang, J., Renaud, P.E., Seuthe, L., Søreide, J., Varpe, Ø., Weslawski, J.M. (in press) In the dark: paradigms of Arctic ecosystems during Polar night challenged by new understanding. Prog Oceanogr
  3. Cohen JH, Berge J, Moline MA, Sørensen AJ, Last K, Falk-Petersen S, Renaud, P.E., Leu, E. et al. (2015) Is ambient light during the high Arctic polar night sufficient to act as a visual cue for zooplankton? PLoS ONE 10 (6): e0126247. doi:10.1371/journal.pone.0126247
  4. Huntington, H.P., Carmack, E., Wassmann, P., Wiese, F., Leu, E., Gradinger, R. (2015) A new perspective on changing Arctic marine ecosystems: Panarchy adaptive cycles in pan-Arctic spatial and temporal scales, in: Sustainable Oceans in the Twenty-First Century, Arico, S. (ed.), UNU-UNESCO.
  5. Daase, M., Falk-Petersen, S., Varpe, Ø., Darnis, G., Søreide, J.E., Wold, A., Leu, E., Berge, J., Philippe, B., Fortier, L. (2013) Plasticity in timing of reproductive events in Calanus glacialis: a Pan-Arctic perspective. Can J Fish Aquat Sci 70(6): 871-884.
  6. Weydmann, A., Søreide, J.E., Kwasniewski, S., Leu, E., Falk-Petersen, S., Berge, J. (2013) Ice-related seasonality in zooplankton community composition in a high arctic fjord. J Plankt Res 35(4): 831-842
  7. Leu, E., Daase, M., Schulz, K.G., Stuhr, A., Riebesell, U. (2013) Effect of ocean acidification on the fatty acid composition of a natural plankton community. Biogeosciences 10: 1143-1153.
  8. Kwasniewski, S., Walkusz, W., Cottier, F., Leu, E. (2013) Mesozooplankton dynamics in relation to food availability during spring and early summer in a high latitude glaciated fjord (Kongsfjorden), with focus on Calanus. J Mar Sys 111-112: 83-96.
  9. Hessen, D.O., Frigstad, H., Færøvig, P.J., Wojewodzic, M.W., Leu, E. (2012) UV radiation and its effect on P-uptake in Arctic diatoms. J Exp Mar Biol Ecol 411:45-51.
  10. Wold, A., Darnis, G., Søreide, J.E., Leu, E., Philippe, B., Fortier, L., Poulin, M., Kattner, G., Graeve, M., Falk-Petersen, S. (2011) Life strategy and diet of Calanus glacialis during the winter-spring transition in Amundsen Gulf, southeastern Beaufort Sea. Polar Biol 34 (12): 1929-1946.
  11. Leu, E., Søreide, J.E., Hessen, D.O., Falk-Petersen, S., Berge, J. (2011) Consequences of changing sea ice cover for primary and secondary producers in European Arctic shelf seas: timing, quantity and quality. Prog Oceanogr 90: 18-32.
  12. Søreide, J.E, Leu, E., Berge, J., Graeve M., Falk-Petersen, S. (2010) Timing of blooms, algal food quality and Calanus glacialis reproduction and growth in a changing Arctic. Global Change Biol 16(11): 3154-3163.
  13. Leu, E., Wiktor, J., Søreide, J.E., Berge, J., Falk-Petersen, S. (2010) Increased irradiance reduces food quality of sea ice algae. Mar Ecol Prog Ser 411: 49-60
  14. 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, A. (2009) Diel vertical migration of Arctic zooplankton during the polar night. Biology Letters 5(1): 69-72.
  15. Hessen, D.O., Leu, E., Færøvig, P., Falk-Petersen, S. (2008) Light and spectral properties as determinants of C:N:P ratios in phytoplankton Deep Sea Res II 55: 2169-2175.
  16. Falk-Petersen, S., Leu, E., Berge, J., Kwasniewski, S., Nygård, H., Røstad, A., Keskinen, E., Thormar, J., von Quillfeldt, C., Wold, A., Gulliksen, B. (2008) Vertical migration in high Arctic waters during autumn 2004 Deep Sea Res II 55: 2275-2284.
  17. Leu, E., Falk-Petersen S., Hessen, D.O. (2007) Ultraviolet radiation negatively affects growth but not food quality of Arctic diatoms. Limnol Oceanogr 52(2): 787-797.
  18. Wold, A., Leu, E., Walkusz, W., Falk-Petersen, S. (2007) Lipids in copepodite stages of Calanus glacialis. Polar Biol 30: 655-658.
  19. Leu, E., Wängberg, S.Å., Wulff, A., Ørbæk, J.B., Falk-Petersen, S., Hessen, D.O. (2006) Effects of changes in ambient PAR and UV radiation on the nutritional quality of an Arctic diatom (Thalassiosira antarctica var. borealis). J Exp Mar Biol Ecol 337: 65-81.
  20. Leu, E., Falk-Petersen S., Kwasniewski S., Wulff A., Edvardsen K., Hessen D.O. (2006) Fatty acid dynamics during the spring bloom in a high Arctic fjord: importance of abiotic factors vs. community changes. Can J Fish Aquat Sci. 63: 2660-2779.
  21. Leu, E., Færøvig, P., Hessen, D.O. (2006) UV effects on the nutritional quality of Selenastrum capricornutum and their consequences for Daphnia magna. Freshw Biol 51: 2296-2308.
  22. Hessen, D.O., Leu, E. (2006) Trophic transfer and trophic modification of fatty acids in arctic lakes. Freshw Biol. 51: 1987-1998.
  23. Leu, E., Krieger-Liszkay, A., Goussias, C. & Gross, E. (2002) Polyphenolic allelochemicals from the aquatic angiosperm Myriophyllum spicatum L. inhibit photosystem II. Plant Physiol 130(4): 2011-2018.

 

Photo of Christian Lydersen

Christian Lydersen

Senior Scientist

Research interests:
  • Polar marine mammals
  • Ecology and physiology
  • Biologging.
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Norwegian Polar InstituteResearch department: Ecotoxicology and ICE Work address Norwegian Polar Institute Fram Centre Tromsø 9296 Norway Work Phone: +47 77 75 05 23

Research interests:

  • Polar marine mammals
  • Ecology and physiology
  • Biologging.

Relevant scientific publications:

  1. Lydersen, C. and Gjertz, I. 1986. Studies of the ringed seal (Phoca hispida) in its breeding habitat in Kongsfjorden, Svalbard. Polar Res. 4: 57-63.
  2. Gjertz, I. and Lydersen, C. 1986. Polar bear predation on ringed seals in the fast-ice of Hornsund, Svalbard. Polar Res. 4: 65-68.
  3. Gjertz, I. and Lydersen, C. 1986. The ringed seal (Phoca hispida) spring diet in northwestern Spitsbergen, Svalbard. Polar Res. 4: 53-56.
  4. Lydersen, C. and Gjertz I. 1987. Population parameters of ringed seals (Phoca hispida) in the Svalbard area. Can. J. Zool. 65: 1021 – 1027.
  5. Lydersen, C., Gjertz I. and Weslawski, J. M. 1989. Stomach contents of autumn-feeding marine vertebrates from Hornsund, Svalbard. Polar Rec. 25: 107-114.
  6. Lydersen, C. and Smith, T. G. 1989. Avian predation on ringed seal Phoca hispida pups. Polar Biol. 9: 489-490.
  7. Lydersen, C., Jensen, P. M. and Lydersen, E. 1990. A survey of the Van Mijen fiord, Svalbard as habitat for ringed seals Phoca hispida. Holarct. Ecol. 13: 130-133.
  8. Ryg, M., Lydersen, C., Markussen, N.H., Smith, T. G. and Øritsland, N.A.. 1990. Estimating the blubber content of phocid seals. Can. J. Fish. Aquat. Sci. 47: 1223-1227.
  9. Øien, N., Folkow, L. and Lydersen, C. 1990. Dive time experiments on minke whales in Norwegian waters during the 1988 season. Rep. Int. Whal. Commn 40: 337-341.
  10. Lydersen, C. and. Øritsland, N. A. 1990. Surface and submerging intervals in minke whale, Balaenoptera acutorostrata, diving cycles. Fauna norv. ser. A 11: 35-37.
  11. Lydersen, C. 1991.Monitoring ringed seal (Phoca hispida) activity by means of acoustic telemetry. Can. J. Zool. 69: 1178-1182.
  12. Lydersen, C. and Ryg M. 1991. Evaluating breeding habitat and populations of ringed seal (Phoca hispida) in Svalbard fjords. Polar Rec. 27: 223-228.
  13. Lydersen, C., Weslawski J. M. and. Øritsland, N. A. 1991. Stomach content analysis of minke whales (Balaenoptera acutorostrata) from the Lofoten and Vesterålen areas, Norway, August 1988. Holartc. Ecol. 14: 219-222.
  14. Lydersen, C., Angantyr, L. A., Wiig, Ø. and Øritsland, T. 1991. Feeding habits of northeast Atlantic harp seals (Phoca groenlandica) along the summer ice edge of the Barents Sea. Can. J. Fish. Aquat. Sci. 48: 2180-2183.
  15. Hammill, M. O., Lydersen, C., Ryg, M. and Smith T. G. 1991. Lactation in the ringed seal (Phoca hispida). Can. J. Fish. Aquat. Sci. 48: 2471-2476.
  16. Smith, T. G. and Lydersen, C. 1991. Availability of suitable land-fast ice and predation as factors limiting ringed seal populations, Phoca hispida, in Svalbard. Polar Res. 10: 585-594.
  17. Ryg, M., Solberg, Y., Lydersen, C. and. Smith, T. G.1992. The scent of rutting male ringed seals (Phoca hispida). J. Zool., Lond. 226: 681-689.
  18. Lydersen, C., Hammill, M. O. and Ryg, M. S.. 1992. Water flux and mass gain during lactation in free living ringed seal (Phoca hispida) pups. J. Zool., Lond. 228: 361-369.
  19. Lydersen, C., Ryg, M. S., Hammill, M. O and O´Brien, P.J. 1992. Oxygen stores and aerobic dive limit of ringed seals (Phoca hispida).Can. J. Zool. 70: 458-461.
  20. Lydersen,C., Griffiths, D., Gjertz, I. and Ø. Wiig. 1992. A tritiated water experiment on a male Atlantic walrus (Odobenus rosmarus rosmarus). Mar. Mammal Sci. 8: 418-420.
  21. Markussen, N.H., Ryg, M. and Lydersen, C. 1992. Food consumption of the NE Atlantic minke whale (Balaenoptera acutorostrata) population estimated with a simulation model. ICES J. Mar. Sci. 49: 317-323.
  22. Ryg, M., Lydersen, C., Knutsen, L. Ø., Bjørge, A., Smith, T. G. and Øritsland, N. A. 1993. Scaling of insulation in seals and whales. J. Zool., Lond. 230: 193-206.
  23. Wiig, Ø., Gjertz, I., Griffiths, D. and Lydersen, C. 1993. Diving patterns of an Atlantic walrus Odobenus rosmarus rosmarus near Svalbard, Polar Biol. 13: 71-72.
  24. Daelemans, F. F., Mehlum, F., Lydersen, C., Schepens, P. J. C. 1993. Mono-orto and non-orto PCBs in arctic ringed seals (Phoca hispida) from the Svalbard area: Analyses and determination of their toxic threat. Chemosphere 27: 429-437.
  25. Lydersen, C., Hammill, M. O. and Ryg, M. S. 1993. Differences in haul-out pattern in two nursing ringed seal (Phoca hispida) pups. Fauna norv. ser. A. 14: 47-49.
  26. Lydersen, C. and Kovacs, K. 1993. Diving behaviour of lactating harp seal (Phoca groenlandica) females from the Gulf of St. Lawrence, Canada. Anim. Behav. 46: 1213-1222.
  27. Lydersen, C. and Hammill, M. O. 1993. Diving in ringed seal (Phoca hispida) pups during the nursing period. Can. J. Zool. 71: 991-996.
  28. Lydersen, C. and Hammill, M. O. 1993. Activity, milk intake and energy consumption in free-living ringed seal (Phoca hispida) pups. J. Comp. Physiol. B 163: 433-438.
  29. Lydersen, C., Hammill, M. O. and Kovacs, K. M. 1994. Diving activity in nursing bearded seal (Erignathus barbatus) pups. Can J. Zool. 72: 96-103.
  30. Lydersen, C., Hammill, M. O. and Kovacs, K. M. 1994. Activity of lactating ice-breeding grey seals (Halichoerus grypus) from the Gulf of St. Lawrence, Canada. Anim. Behav. 48: 1417-1425.
  31. Hammill, M. O., Kovacs, K. M. and Lydersen, C. 1994. Local movements by nursing bearded seal (Erignathus barbatus) pups in Kongsfjorden, Svalbard. Polar Biol. 14: 569-570
  32. Lydersen, C., Hammill, M. O. and Kovacs, K. M. 1995. Milk intake, growth and energy consumption in pups of ice-breeding grey seals (Halichoerus grypus) from the Gulf of St. Lawrence, Canada. J. Comp. Physiol. B 164: 585-592.
  33. Lydersen, C. and Kovacs K. M. 1995. Paralysis as a defence response to threatening stimuli in harp seals (Phoca groenlandica). Can. J. Zool. 73: 486-492.
  34. Stokkan, K.-A., Vaughan, M. K., Reiter, R. J., Folkow, L. P., Mårtensson, P.-E., Sager, G., Lydersen, C and Blix A. S. 1995. Pineal and thyroid functions in newborn seals. Gen. Comp. Endocrin. 98: 321-331.
  35. Kovacs, K. M., Lydersen, C. and Gjertz, I. 1996. Birth site characteristics and prenatal molting in bearded seals (Erignathus barbatus). J. Mammal. 77: 1085-1091.
  36. Kovacs, K. M., Lydersen, C., Hammill, M. O. and Lavigne, D. M.1996. Reproductive effort of male hooded seals (Cystophora cristata): estimates from mass loss. Can. J. Zool. 74: 1521-1530.
  37. Lydersen, C. and Kovacs, K. M. 1996. Energetics of lactation in harp seals (Phoca groenlandica) from the Gulf of St. Lawrence, Canada. J. Comp. Physiol. B 166: 295-304.
  38. Lydersen, C., Kovacs, K. M., Hammill, M. O. and Gjertz, I. 1996. Energy intake and utilisation by nursing bearded seal (Erignathus barbatus) pups from Svalbard, Norway. J. Comp. Physiol. B 166: 405-411.
  39. Kovacs, K. M.; Lydersen, C., Hammill, M. O., White, B. N., Wilson, P. J. and Malik, S. 1997. A harp seal x hooded seal hybrid. Mar. Mammal Sci. 13: 460-468.
  40. Hammill, M. O., Lydersen, C., Kovacs, K. M. and Sjare, B. 1997. Estimated fish consumption by hooded seals (Cystophora cristata), in the Gulf of St Lawrence. N.W. Atl. J. Fish. Sci. 22: 249-257.
  41. Lydersen, C., Kovacs, K. M. and Hammill, M. O. 1997. Energetics during nursing and early postweaning fasting in hooded seal (Cystophora cristata) pups from the Gulf of St Lawrence, Canada. J. Comp. Physiol. B 167: 81-88.
  42. Wolkers, J., Burkow, I., Lydersen, C., Dahle, S., Monshouwer, M. and Witkamp, R. 1998. Congener specific PCB and polychlorinated camphene (toxaphene) levels in Svalbard ringed seals (Phoca hispida) in relation to sex, age, condition, and cytochrome P450 enzyme activity. Sci. Total Environ. 216: 1-11.
  43. Wolkers, J., Witkamp, R. F., Nijmeijer, S. M., Burkow, I. C., Groene, E. M. de, Lydersen, C., Dahle, S. and Monshouwer, M. 1998. Phase I and phase II enzyme activities in ringed seals (Phoca hispida); characterisation of hepatic cytochrome P450 by activity patterns, inhibition studies, mRNA analyses, and western blotting. Aquat. Toxicol. 44: 103-115.
  44. Marta, M., Patamia, M., Colella, A., Sacchi, S., Pomponi, M., Kovacs, K. M., Lydersen, C. and Giardina, B. 1998. Anionic binding site and 2,3- DPG effect in bovine hemoglobin. Biochemistry 37: 14024-14029.
  45. Lydersen, C. 1998. Status and biology of ringed seals (Phoca hispida) in Svalbard. NAMMCO Sci. Publ. 1: 46-62.
  46. Andersen, M., Hjelset, A. M., Gjertz, I., Lydersen, C. and Gulliksen, B. 1999. Growth, age at sexual maturity and condition in bearded seals (Erignathus barbatus) from Svalbard, Norway. Polar Biol. 21: 179-185.
  47. Hjelset. A. M., Andersen, M., Gjertz. I., Lydersen, C. and Gulliksen, B. 1999. Feeding habits of bearded seals (Erignathus barbatus) from the Svalbard area, Norway. Polar Biol. 21: 186-193.
  48. Wolkers, J., Burkow, I., Monshouwer, M., Lydersen, C., Dahle, S. and Witkamp, R. F. 1999. Cytochrome P450-mediated enzyme activities and polychlorinated biphenyl accumulation in harp seal (Phoca groenlandica). Mar. Environ. Res. 48: 59-72.
  49. Debier, C., Kovacs, K. M., Lydersen, C., Mignolet, E. and Larondelle, Y. 1999. Vitamin E and vitamin A contents, fatty acid profiles, and gross composition of harp and hooded seal milk through lactation.  Can. J. Zool. 77: 952-958.
  50. Lydersen, C. and Kovacs, K. M. 1999. Behaviour and energetics of ice-breeding, North Atlantic phocid seals during the lactation period. Mar. Ecol. Prog. Ser. 187: 265-281.
  51. Severinsen, T., Skaare, J. U. and Lydersen, C. 2000. Spatial distribution of persistent organochlorines in ringed seal (Phoca hispida) blubber. Mar. Environ. Res. 49: 291-302.
  52. Lydersen, C., Kovacs, K. M. and Hammill, M. O. 2000. Reversed molting pattern in starveling gray (Halichoerus grypus) and harp (Phoca groenlandica) seal pups. Mar. Mammal Sci. 16: 489-493.
  53. Wolkers, H., Burkow, I. C., Lydersen, C. and Witkamp, R. F. 2000. Chlorinated pesticide concentrations with emphasis on the polychlorinated camphenes (toxaphenes), in relation to cytochrome P450 enzyme activities in Barents Sea harp seals (Phoca groenlandica). Environ. Toxicol. Chem. 19: 1632-1637.
  54. Wathne, J. A., Haug, T., and Lydersen, C. 2000. Prey preference and niche overlap of ringed seals (Phoca hispida) and harp seals (Phoca groenlandica) in the Barents Sea. Mar. Ecol. Progr. Ser. 194: 233-239.
  55. Dahl, T. M., Lydersen, C., Kovacs, K. M.; Falk-Petersen, S., Sargent, J., Gjertz, I. and Gulliksen, B. 2000. Fatty acid composition of the blubber in white whales (Delphinapterus leucas). Polar Biol. 23: 401-409.
  56. Gjertz, I.; Kovacs, K. M., Lydersen, C. and Wiig, Ø. 2000. Movements and diving of bearded seal (Erignathus barbatus) mother and pups during lactation and post-weaning. Polar Biol. 23: 559-566.
  57. Grahl-Nielsen, O., Hammill, M.O., Lydersen, C. and Wahlstrom, S. 2000. Transfer of fatty acids from female seal blubber via milk to pup blubber. J. Comp. Physiol. B 170: 277-283.
  58. Gjertz, I.; Kovacs, K. M., Lydersen, C. and Wiig, Ø. 2000. Movements and diving of adult ringed seals (Phoca hispida) in Svalbard. Polar Biol. 23: 651-656.
  59. Krafft, B. A., Lydersen, C., Kovacs, K. M., Gjertz, I. and Haug, T. 2000. Diving behaviour of lactating bearded seals (Erignathus barbatus) in the Svalbard area. Can. J. Zool. 78: 1408-1418.
  60. Bang, K., Jenssen, B.M., Lydersen, C. and Skaare, J. U. 2001 Organochlorine burdens in blood of ringed and bearded seals from north-western Svalbard. Chemosphere 44: 193-203.
  61. Andersen, G., Kovacs, K. M., Lydersen, C., Skaare, J. U., Gjertz, I. and Jenssen, B. M. 2001. Concentrations and patterns of organochlorine contaminants in white whales (Delphinapterus leucas) from Svalbard, Norway. Sci. Total Environ. 264: 267-281.
  62. Lydersen, C., Kovacs, K. M. and Lydersen, E. 2001. Rust-colored bearded (Erignathus barbatus) and ringed (Phoca hispida) seals from Svalbard, Norway. J. Mammal. 82: 225-230.
  63. Gjertz, I., Lydersen, C. and Wiig, Ø. 2001. Distribution and diving of harbour seals (Phoca vitulina) in Svalbard. Polar Biol. 24: 209-214.
  64. Gjertz, I., Griffiths, D., Krafft, B., Lydersen, C.and Wiig, Ø. 2001. Diving and haul-out patterns of walruses Odobenus rosmarus on Svalbard. Polar Biol. 24: 314-319.
  65. Urashima, T., Arita, M., Yoshida, M., Nakamura, T., Arai, I., Saito, T., Arnould, J. P. Y., Kovacs, K. M. and Lydersen, C. 2001. Chemical characterisation of the oligosaccharides in hooded seal (Cystophora cristata) and Australian fur seal (Arctocephalus pusillus doriferus) milk. Comp Biochem. Physiol. B 128: 307-323.
  66. Lydersen, C., Martin, A. R., Kovacs, K. M. and Gjertz, I. 2001. Summer and autumn movements of white whales (Delphinapterus leucas) in Svalbard, Norway. Mar. Ecol. Progr. Ser. 219: 265-274.
  67. Van Parijs, S. M., Kovacs, K. M. and Lydersen, C. 2001. Spatial and temporal distribution of vocalising male bearded seals – implications for male mating strategies. Behaviour 138: 905-922.
  68. Jørgensen, C., Lydersen, C., Brix, O. and Kovacs, K. M. 2001. Diving development in nursing harbour seal pups. J. Exp. Biol. 204: 3993-4004.
  69. Wolkers, H., Burkow, I. C., Hammill, M. O., Lydersen, C. and Witkamp, R. F. 2002. Transfer of polychlorinated biphenyls and chlorinated pesticides from mother to pup in relation to cytochrome P450 enzyme activities in harp seals (Phoca groenlandica) from the Gulf of St. Lawrence. Environ. Toxicol. Chem. 21: 94-101.
  70. Krafft, B. A., Lydersen, C., Gjertz, I. and Kovacs, K. M. 2002. Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard. Polar Biol. 25: 230-234.
  71. Lydersen, C., Wolkers, H., Severinsen, T., Kleivane, L., Nordøy, E. S. and Skaare, J. U. 2002. Blood is a poor substrate for monitoring pollution burdens in phocid seals. Sci. Total Environ. 292: 193-203.
  72. Tittlemier, S., Borrell, A., Duffe, J., Duignan, P. J., Fair, P., Hall, A., Hoekstra, P., Kovacs, K. M., Krahn, M. M., Lebeuf, M., Lydersen, C., Muir, D., O’Hara, T., Olson, M., Pranschke, J., Ross, P., Siebert, U., Stern, G., Tanabe, S. and Norstrom, R. 2002. Global distribution of halogenated dimethyl bipyrroles in marine mammal blubber. Arch. Environ. Contam. Toxicol. 43: 244-255.
  73. Urashima, T., Sato, H., Munakata, J., Nakamura, T., Arai, I., Saito, T., Tetsuka, M., Fukui, Y., Ishikawa, H., Lydersen, C. and Kovacs, K. M. 2002. Chemical characterisation of the oligosaccharides in beluga (Delphinapterus leucas) and minke whale (Balaenoptera acutorostrata) milk. Comp. Biochem. Physiol. B 132: 611-624
  74. Hop, H., Pearson, T., Hegseth E. N., Kovacs, K. M., Wiencke, C., Kwasniewski, S., Eiane, K., Mehlum, F., Gulliksen, B., Wlodarska-Kowalczuk, M., Lydersen, C., Weslawski, J. M., Cochrane, S., Gabrielsen, G. W., Leakey, R., Lønne, O. J., Zajaczkowski, M., Falk-Petersen, S., Kendall, M., Wängberg, S. -Å., Bischof, K., Voronkov, A. Y., Kovaltchouk, N. A., Wiktor, J., Poltermann, M., di Prisco, G., Papucci, C. and Gerland, S. 2002. The marine ecosystem of Kongsfjorden, Svalbard. Polar Res. 21: 167-208.
  75. Lydersen, C., Nøst, O. A., Lovell, P., McConnell, B. J., Gammelsrød, T., Hunter, C., Fedak, M. A. and Kovacs, K. M. 2002. Salinity and temperature structure of a freezing Arctic fjord – monitored by white whales (Delphinapterus leucas). Geophys. Res. Lett. 29: art. no. 2119, doi: 10.1029/2002GL015462.  4 pp.
  76. Karlsen, J., Bisther, A., Lydersen, C., Haug, T. and Kovacs, K. M. 2002. Summer vocalisations of adult male white whales (Delphinapterus leucas) in Svalbard, Norway. Polar Biol. 25: 808-817.
  77. Lydersen, C., Kovacs, K. M., Ries, S. and Knauth, M. 2002. Precocial diving and patent foramen ovale in bearded seal (Erignathus barbatus) pups. J. Comp. Physiol. B 172: 713-717.
  78. Pomponi, M., Bertonati, C., Patamia, M., Marta, M., Derocher, A. E., Lydersen, C., Kovacs, K. M., Wiig, Ø. and  Bårdgard, A. J. 2002. Polar bear hemoglobin and human HbAo: same 2,3-diphosphoglycerate binding Site but asymmetry of the binding? Hemoglobin 26: 363-371.
  79. Van Parijs, S.M., Lydersen, C. and Kovacs, K. M. 2003. Vocalizations and movements suggest alternative mating tactics in male bearded seals. Anim. Behav. 65: 273-283.
  80. Sørmo, E. G., Skaare, J. U., Lydersen, C., Kovacs, K. M., Hammill, M. O. and Jenssen, B. M. 2003. Partitioning of persistent organic pollutants in grey seal (Halichoerus grypus) mother-pup pairs. Sci. Total Environ. 302: 145-155.
  81. Van Parijs, S.M., Lydersen, C. and Kovacs, K. M. 2003. Sounds produced by individual white whales, Delphinapterus leucas from Svalbard during capture. J. Acoust. Soc. Am. 113: 57-60.
  82. Urashima, T., Nakamura, T., Yamaguchi, K., Munakata, J., Arai. I., Sato, T., Lydersen, C. and Kovacs, K. M. 2003. Chemical characterization of the oligosaccharides in milk of high Arctic harbour seal (Phoca vitulina vitulina). Comp. Biochem. Physiol. A 135: 549-563.
  83. Reder, S., Lydersen, C., Arnold, W. and Kovacs, K. M. 2003. Haul-out behaviour of high Arctic harbour seals (Phoca vitulina vitulina) in Svalbard, Norway. Polar Biol. 27: 6-16.
  84. Grahl-Nielsen, O., Andersen, M., Derocher, A. E., Lydersen, C., Wiig, Ø. and Kovacs, K. M. 2003. Fatty acid composition of the adipose tissue of polar bears and of their prey: ringed seals, bearded seals and harp seals. Mar. Ecol. Progr. Ser. 265: 275-282.
  85. Van Parijs, S.M., Lydersen, C. and Kovacs, K. M. 2004. Effects of ice cover on the behavioural patterns of aquatic-mating male bearded seals. Anim. Behav. 68: 89-96.
  86. Wolkers, H., Lydersen, C. and Kovacs, K. M. 2004. Accumulation and lactational transfer of PCBs and pesticides in harbor seals (Phoca vitulina) from Svalbard, Norway. Sci. Total Environ. 319: 137-146.
  87. Kleivane, L., Severinsen, T., Lydersen, C., Berg, V. and Skaare, J. U. 2004. Total blubber burden of organochlorine pollutants in phocid seals; methods and suggested standardization.  Sci. Total Environ. 320: 109-119.
  88. Lydersen, C., Nøst, O. A., Kovacs, K. M. and Fedak, M. A. 2004. Temperature data from Norwegian and Russian waters of the northern Barents Sea collected by free-living ringed seals. J. Mar. Syst. 46: 99-108.
  89. Wolkers, H., Bavel, B. van, Derocher, A. E., Wiig, Ø., Kovacs, K. M., Lydersen, C. and Lindström, G. 2004. Congener-specific accumulation and food chain transfer of polybrominated diphenyl ethers in two Arctic food chains. Environ. Sci. Technol. 38: 1667-1674.
  90. Urashima, T., Nakamura, T., Nakagawa, D., Noda, M., Arai, I., Saito, T., Lydersen C. and Kovacs, K. M.  2004.  Characterization of oligosaccharides in milk of bearded seal (Erignathus barbatus). Comp. Biochem. Physiol. B 138: 1-18.
  91. Andersen, S. M., Lydersen, C., Grahl-Nielsen, O. and Kovacs, K. M. 2004. Autumn diet of harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard assessed via scat and fatty-acid analyses. Can. J. Zool. 82: 1230-1245.
  92. Pomponi, M., Gavuzzo, E., Bertonati, C., Derocher, A. E., Lydersen, C., Wiig, Ø. and Kovacs, K. M. 2004. Hemoglobin, pH and DPG/chloride shifting. Biochimie 86: 927-932.
  93. Lydersen, C. and Kovacs, K. M. 2005. Growth and population parameters of the world’s northernmost harbour seals Phoca vitulina residing in Svalbard, Norway. Polar Biol. 28: 156-163.
  94. Birkeland, A., Kovacs, K. M., Lydersen, C. and Grahl-Nielsen, O. 2005. Transfer of fatty acids from mothers to their calves during lactation in white whales (Delphinapterus leucas). Mar. Ecol. Progr. Ser. 298: 287-294.
  95. Hofmeyr, G. J. G., Krafft, B. A., Kirkman, S. P., Bester, M. N., Lydersen, C. and Kovacs K. M. 2005. Population changes of Antarctic fur seals at Nyrøysa, Bouvetøya. Polar Biol. 28: 725-731.
  96. Andersen, G., Foreid, S., Skaare, J. U., Jenssen, B. M., Lydersen, C. and Kovacs, K. M.. 2006. Levels of toxaphene congeners in white whales (Delphinapterus leucas) from Svalbard, Norway. Sci. Total Environ. 357: 128-137.
  97. Wolkers, H., Lydersen, C., Kovacs, K. M., Burkow, I. and Bavel, B. van. 2006. Accumulation, metabolism, and food-chain transfer of chlorinated and brominated contaminants in subadult white whales (Delphinapterus leucas) and narwhals (Monodon monoceros) from Svalbard, Norway. Arch. Environ. Contam. Toxicol. 50: 69-78.
  98. Gazo, M., Lydersen, C. and Aguilar, A. 2006. Diving behaviour of Mediterranean monk seal pups during lactation and post weaning. Mar Ecol. Progr. Ser. 308: 303-309.
  99. Tryland, M., Thoresen, S. I., Kovacs, K. M. and Lydersen, C. 2006. Serum chemistry values of free-ranging white whales (Delphinapterus leucas) in Svalbard. Vet. Clin. Pathol. 35: 199-203.
  100. Andersen, M., Gwynn, J. P.; Dowdall, M., Kovacs, K. M. and Lydersen, C. 2006. Radiocaesium (137Cs) in marine mammals from Svalbard, the Barents Sea and the North Greenland Sea. Sci. Total Environ. 363: 87-94.
  101. Marshall, C. D., Amin, H., Kovacs, K. M. and Lydersen, C. 2006. Microstructure and innervation of the mystacial vibrissal follicle-sinus complex in bearded seals, Erignathus barbatus (Pinnipedia: Phocidae). Anat. Rec. 288A: 13-15.
  102. Carlens, H., Lydersen, C., Krafft, B. A. and Kovacs, K. M. 2006. Spring haul-out behavior of ringed seals (Pusa hispida) in Kongsfjorden, Svalbard. Mar. Mammal Sci. 22: 379-393.
  103. Krafft, B. A., Kovacs, K. M., Ergon, T., Andersen, M., Aars, J., Haug, T. and Lydersen, C. 2006. Abundance of ringed seals (Pusa hispida) in the fjords of Spitsbergen, Svalbard, during the peak molting period. Mar. Mammal Sci. 22: 394-412.
  104. Krafft, B. A., Lydersen, C. and Kovacs, K. M. 2006. Serum haptoglobin concentrations in ringed seals (Pusa hispida) from Svalbard, Norway. J. Wildl. Dis. 42:442-446.
  105. Sørmo, E.G., Pettersvik M. S., Jenssen, B. M., Hop, H., Bæk, K., Kovacs, K. M., Lydersen, C., Falk-Petersen, S., Gabrielsen, G. W., Lie, E. and Skaare, J. U. 2006. Biomagnification of polybrominated diphenyl ether and hexabromocyclododecane flame retardants in the polar bear food chain in Svalbard, Norway. Environ. Toxicol. Chem. 25: 2503-2511.
  106. Tryland, M., Krafft, B. A., Lydersen, C., Kovacs, K. M. and Thoresen, S. I. 2006. Serum chemistry values for free-ranging ringed seals (Pusa hispida) in Svalbard. Vet. Clin. Pathol. 35: 405-412.
  107. Brown, J., Dowdall, M., Gwynn, J. P., Børettzen, P., Selnæs, Ø. G., Kovacs, K. M. and Lydersen, C. 2006. Probabilistic biokinetic modelling of radiocaesium uptake in Arctic seal species: Verification of modelled data with empirical observations. J. Environ. Radioact. 88: 289-305.
  108. Krafft, B. A., Kovacs, K. M., Frie, A. K., Haug, T., and Lydersen, C. 2006. Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002 – 2004. ICES J. Mar. Sci. 63: 1136-1144.
  109. Davis, C., Kovacs, K. M., Lydersen, C. and Van Parijs, S. M. 2006. Development of display behavior in young captive bearded seals. Mar. Mammal Sci. 22: 952-965.
  110. Hofmeyr, G. J. G., Bester, M. N., Kirkman, S. P., Lydersen, C. and Kovacs, K. M. 2006. Entanglement of Antarctic fur seals at Bouvetøya, Southern Ocean. Mar. Pollut. Bull. 52: 1077-1080.
  111. Wolkers, H., Bavel, B, van, Ericson, I.; Skoglund, E., Kovacs, K. M. and Lydersen, C. 2006. Congener-specific accumulation and patterns of chlorinated and brominated contaminants in adult male walruses from Svalbard, Norway: indications for individual-specific prey selection. Sci. Total Environ. 370: 70-79.
  112. Gwynn, J. P., Brown, J. E., Kovacs, K. M. and Lydersen, C. 2006. The derivation of radionuclide transfer parameters for and dose-rates to an adult ringed seal (Phoca hispida) in an Arctic environment. J. Environ. Radioact. 90: 197-209.
  113. Risch, D., Clark, C. W., Corkeron, P. J., Elepfandt, A., Kovacs, K. M., Lydersen, C., Stirling, I. and Van Parijs S. M. 2007. Vocalizations of male bearded seals (Erignathus barbatus): classification and geographical variation. Anim. Behav. 73: 747-762.
  114. Krafft, B. A., Kovacs, K. M. and Lydersen, C. 2007. Distribution of sex and age groups of ringed seals (Pusa hispida) in the fast-ice breeding habitat of Kongsfjorden, Svalbard. Mar. Ecol. Progr. Ser. 335: 199-206.
  115. Lydersen, C., Martin, T., Gjertz, I. and Kovacs, K. M. 2007. Satellite tracking and diving behaviour of sub-adult narwhals (Monodon monoceros) in Svalbard, Norway. Polar Biol. 30: 437-442.
  116. Wiig, Ø., Bachmann, L., Janik, V. M., Kovacs, K. M. and Lydersen, C. 2007. Spitsbergen bowhead whales revisited. Mar. Mammal Sci. 23: 688-693.
  117. Labansen, A. L., Lydersen, C., Haug, T. and Kovacs, K. M. 2007. Spring diet of ringed seals (Phoca hispida) from northwestern Spitsbergen, Norway. ICES J. Mar. Sci. 64: 1246–1256.
  118. Wiig, Ø., Born, E. W., Gjertz, I., Lydersen, C. and Stewart, R. E. A. 2007. Historical sex-specific distribution of Atlantic walrus (Odobenus rosmarus rosmarus) in Svalbard assessed by mandible measurements. Polar Biol. 31: 69-75.
  119. Prestrud, K. W., Åsbakk, K., Fuglei, E., Mørk, T., Stien, A., Ropstad, E., Tryland, M., Gabrielsen, G. W., Lydersen, C., Kovacs, K. M., Loonen, M. J. J. E., Sagerup, K. and Oksanen, A. 2007. Serosurvey for Toxoplasma gondii in arctic foxes and possible sources of infection in the high Arctic of Svalbard. Vet. Parasitol. 150: 6-12.
  120. Freitas, C., Kovacs, K. M., Ims, R. A., Fedak, M. A. and Lydersen C. 2008. Ringed seal post-moulting movement tactics and habitat selection. Oecologia 155: 193-204.
  121. Lydersen, C., Aars, J. and Kovacs, K. M. 2008. Estimating the number of walruses in Svalbard from aerial surveys and behavioural data from satellite telemetry.  Arctic 61: 119-128.
  122. Strandberg, U., Käkëlä, A., Lydersen, C., Kovacs, K. M., Grahl-Nielsen, O., Hyvärinen, H. and Käkëlä, R. 2008. Stratification, composition and function of marine mammal blubber: the ecology of fatty acids in marine mammals. Physiol. Biochem. Zool. 81: 473-485.
  123. Freitas, C., Lydersen, C., Fedak, M. A. and Kovacs, K. M. 2008. A simple new algorithm to filter marine mammal Argos locations. Mar. Mammal Sci. 24: 315-325.
  124. Marshall, C. D., Kovacs, K. M. and Lydersen, C. 2008. Feeding kinematics, suction, and hydraulic jetting capabilities in bearded seals (Erignathus barbatus). J. Exp. Biol. 211: 699-708.
  125. Wolkers, H., Krafft, B. A., Bavel, B. Van, Helgason, L. B., Lydersen, C. and Kovacs, K. M. 2008. Biomarker responses and decreasing contaminant levels in ringed seals (Pusa hispida) from Svalbard, Norway. J. Toxicol. Environ. Health A 71: 1009-1018.
  126. Freitas, C, Kovacs, K. M., Lydersen, C. and Ims, R. A. 2008. A novel method for quantifying habitat selection and predicting habitat use. J. Appl. Ecol. 45: 1213-1220.
  127. Freitas, C., Kovacs, K. M., Ims, R. A. and Lydersen, C. 2008. Predicting habitat use by ringed seals (Phoca hispida) in a warming Arctic. Ecol. Model. 217: 19-32.
  128. Kovacs, K. M. and Lydersen, C. 2008. Climate change impacts on seals and whales in the North Atlantic Arctic and adjacent shelf waters. Sci. Progr. 91: 117-150.
  129. Lindqvist, C., Bachmann, L., Andersen, L. W., Born, E. W., Arnason, U., Kovacs, K. M., Lydersen, C., Abramov, A. V. And Wiig, Ø. 2009. The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited. Zool. Script. 38: 113-127.
  130. Freitas, C., Kovacs, K. M., Ims, R. A., Fedak, M. A. and Lydersen, C. 2009. Deep into the ice: over-wintering and habitat selection in male Atlantic walruses. Mar. Ecol. Progr. Ser.  375: 247-261.
  131. Watanabe, Y., Lydersen, C., Sato, K., Naito, Y., Miyazaki, N. and Kovacs, K. M. 2009.  Diving behavior and swimming style of nursing bearded seal pups. Mar. Ecol. Progr. Ser. 380: 287-294.
  132. Tryland, M., Lydersen, C., Kovacs, K. M. and Thoresen, S. I. 2009. Serum chemistry reference values in free-ranging north Atlantic male walruses (Odobenus rosmarus rosmarus) from the Svalbard archipelago. Vet. Clin. Pathol. 38: 501-506.
  133. Biuw, M., Krafft, B. A., Hofmeyr, G. J. G., Lydersen, C. and Kovacs, K. M. 2009. Time budgets and at-sea behaviour of lactating female Antarctic fur seals (Arctocephalus gazella) at Bouvetøya. Mar. Ecol. Progr. Ser. 385: 271-285.
  134. Kinoshita, M., Ohta, H., Higaki, K., Kojima, Y., Urashima, T., Nakajima, K., Suzuki, M., Kovacs, K. M., Lydersen, C., Hayakawa, T. and Kakehi, K. 2009. Structural characterization of multibranched oligosaccharides from seal milk by a combination of off-line high-performance liquid chromatography-matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry and sequential exoglycosidase digestion. Anal. Biochem. 388: 242-253.
  135. Skoglund, E.G., Lydersen, C., Grahl-Nielsen, O., Haug, T. and Kovacs, K. M. 2010. Fatty acid composition of the blubber and dermis of adult male Atlantic walruses (Odobenus rosmarus rosmarus) in Svalbard, and their potential prey. Mar. Biol. Res. 6: 239-250.
  136. Jensen, S. K., Aars, J., Lydersen, C., Kovacs, K. M. and Åsbakk, K. 2010. The prevalence of Toxoplasma gondii in polar bears and their marine mammal prey: evidence for a marine transmission pathway? Polar Biol. 33: 599-606.
  137. Routti, H., Jenssen, B. M., Lydersen, C., Bäckman, C., Arukwe, A., Nyman, M., Kovacs, K. M. and Gabrielsen, G. W. 2010. Hormone, vitamin and contaminant status during the moulting/fasting period in ringed seals (Pusa [Phoca] hispida) from Svalbard. Comp. Biochem. Physiol. A 155: 70-76.
  138. Biuw, M., Lydersen, C., deBruyn, N., Arriola, A., Hofmeyr, G., Kritzinger, P., Kovacs, K.M. 2010. Long-range migration of a chinstrap penguin from Bouvetøya to Montagu Island, South Sandwich Islands. Antarct. Sci. 22: 157-162.
  139. Wiig, Ø., Bachmann, L., Øien, N., Kovacs, K. M. and Lydersen, C. 2010. Observations of bowhead whales (Balaena mysticetus) in the Svalbard area 1940-2009. Polar Biol. 33: 979-984.
  140. O’Corry-Crowe, G.M., Lydersen, C., Heide-Jørgensen, M.-P., Hansen, L., Mukhametov, L.M., Dove, O. and Kovacs, K.M. 2010. Population genetic structure and evolutionary history of North Atlantic beluga whales (Delphinapterus leucas) from West Greenland, Svalbard and the White Sea. Polar Biol. 33: 1179-1194.
  141. Hofmeyr, G.J.G., Bester, M.N., Kirkman, S.P., Lydersen, C. and Kovacs, K.M. 2010. Intraspecific differences in the diet of Antarctic fur seals at Nyrøysa, Bouvetøya. Polar Biol. 33: 1171-1178.
  142. Johansen, C. E., Lydersen, C., Aspholm, P. E., Haug, T. and Kovacs, K. M. 2010. Helminth parasites in ringed seals (Pusa hispida) from Svalbard, Norway with special emphasis on nematodes: variation with age, sex, diet and location of host. J. Parasitol. 96: 946-953.
  143. Garde, E., Frie, A. K., Dunshea, G., Hansen, S. H., Kovacs, K. M. and Lydersen, C. 2010. Harp seal ageing techniques – teeth, aspartic acid racemization, and telomere sequence analysis. J. Mammal. 91: 1365-1374.
  144. Biuw, M., Nøst, O. A., Stien, A., Zhou, Q., Lydersen, C. and Kovacs, K. M. 2010. Effects of hydrographic variability on the spatial, seasonal and diel diving patterns of southern elephant seals in the eastern Weddell Sea. PLoS ONE 5(11): e13816. 14 pp.
  145. Lydersen, C. and Kovacs, K. M. 2010. Status and biology of harbour seals (Phoca vitulina) in Svalbard. NAMMCO Sci. Publ. 8: 47-60.
  146. Labansen, A. L., Lydersen, C., Levermann, N., Haug, T. and Kovacs, K. M. 2011. Diet of ringed seals (Pusa hispida) from Northeast Greenland. Polar Biol. 34: 227-234.
  147. Andersen, L. W., Lydersen, C., Frie, A. K., Rosing-Asvid, A., Hauksson, E. and Kovacs, K. M. 2011. A population on the edge: genetic diversity and population structure of the world’s northernmost harbour seals (Phoca vitulina). Biol. J. Linn. Soc. 102: 420-439.
  148. Kovacs, K. M., Lydersen, C., Overland, J. E. and Moore, S. E. 2011. Impacts of changing sea-ice conditions on Arctic marine mammals. Mar. Biodiv. 41: 181-194.
  149. Olsen, M. T., Hirsch-Volny, V., Berube, M., Dietz, R., Lydersen, C., Kovacs, K. M., Dodd, R. S. and Palsbøll, P. J. 2011. A simple route to single-nucleotide polymorphisms in a nonmodel species: identification and characterization of SNPs in the Arctic ringed seal (Pusa hispida hispida). Molec. Ecol. Resources 11: 1-11.
  150. Mauritzen, C., Hansen, E., Andersson, M., Berx, B. , Beszczynska-Möller, A., Burud, I., Christensen, K.H., Debernard, J., de Steur, L., Dodd, P., Gerland, S., Godøy, Ø., Hansen, B., Hudson, S., Høydalsvik, F., Ingvaldsen, R., Isachsen, P.E., Kasajima, Y., Koszalka, I., Kovacs, K. M., Køltzow, M., LaCasce, J.H., Lee, C. M., Lavergne, T., Lydersen, C., Nicolaus, M., Nilsen, F., Nøst, O.A., Orvik, K.A., Reigstad, M., Schyberg, H., Seuthe, L., Skagseth, Ø., Skarðhamar, J., Skogseth, R., Sperrevik, A., Svensen, C., Søiland, H., Teigen, S.H., Tverberg, V. and Wexels Riser, C. 2011. Closing the Loop – Approaches to monitoring the state of the Arctic Mediterranean during the International Polar Year 2007-2008. Progr. Oceanogr. 90: 62-89.
  151. Leclerc, L.-M., Lydersen, C., Haug, T., Glover, K. A., Fisk, A. T. and Kovacs, K. M. 2011. Greenland sharks (Somniosus microcephalus) scavenge offal from minke (Balaenoptera acutorostrata) whaling operations in Svalbard (Norway). Polar Res. 30, 7342, doi: 10.3402/polar.v30i0.7342
  152. Villanger, G. D., Lydersen, C., Kovacs, K. M.. Lie, E., Skaare, J. U. and Jenssen, B. M. 2011. Disruptive effects of persistent organohalogen contaminants on thyroid function in white whales (Delphinapterus leucas) from Svalbard. Sci. Total Environ. 409: 2511-2524.
  153. Gabrielsen, K. M., Villanger, G. D., Lie, E., Karimi, M., Lydersen, C., Kovacs, K. M. and Jenssen, B. M. 2011. Levels and patterns of hydroxylated polychlorinated biphenyls (OH-PCBs) and their associations with thyroid hormones in hooded seal (Cystophora cristata) mother-pup pairs. Aquat. Toxicol. 105: 482-491.
  154. Nøst, O. A., Biuw, M., Tverberg, V., Lydersen, C., Hattermann, T., Zhou, Q., Smedsrud, L. H. and Kovacs, K. M. 2011. Eddy overturning of the Antarctic Slope Front controls glacial melting in the Eastern Weddell Sea. J. Geophys. Res. 116, C11014, doi:10.1029/2011JC006965.
  155. Moore, S. E., Stafford, K. M., Melling, H., Berchok, C., Wiig, Ø., Kovacs, K. M., Lydersen, C. and Richter-Menge, J. 2012. Comparing marine mammal acoustic habitats in Atlantic and Pacific sectors of the High Arctic: year-long records from Fram Strait and the Chukchi Plateau. Polar Biol. 35: 475-480.
  156. Kovacs, K.M., Aguilar, A., Aurioles, D., Burkanov, V., Campagna, C., Gales, N., Gelatt, T., Goldsworthy, S., Goodman, S.J., Hofmeyr, G.J.G., Härkönen, T., Lowry, L., Lydersen, C., Schipper, J., Sipilä, T., Southwell, C., Stuart, S., Thompson, D. and Trillmich, F. 2012. Global threats to pinnipeds. Mar. Mammal Sci. 28: 414-536.
  157. Lydersen, C., Freitas, C., Wiig, Ø., Bachmann, L., Heide-Jørgensen, M. P., Swift, R. and Kovacs, K. M. 2012. Lost highway not forgotten: Satellite tracking of a bowhead whale (Balaena mysticetus) from the critically endangered Spitsbergen stock. Arctic 65: 76-86.
  158. Freitas, C., Kovacs, K.M., Andersen, M., Aars, J., Sandven, S., Skern-Mauritzen, M., Pavlova, O. & Lydersen, C. 2012. Importance of fast ice and glacier fronts for female polar bears and their cubs during spring in Svalbard, Norway. Mar. Ecol. Progr. Ser. 447: 289-304.
  159. Tryland, M., Nymo, I. H., Nielsen, O., Nordøy, E. S., Kovacs, K. M., Krafft, B. A., Thoresen, S. I., Åsbakk, K., Osterrieder, K., Roth, S. J., Lydersen, C., Godfroid, J. and Blix, A. S. 2012. Serum chemistry and antibodies against pathogens in Antarctic fur seals, Weddell seals, crabeater seals and Ross seals. J. Wildl. Dis. 48: 632-645.
  160. MacNeil, M. A., McMeans, B. C., Hussey, N. E., Vecsei, P., Svavarsson, J., Kovacs, K. M., Lydersen, C., Treble, M., Skomal, G. B., Ramsey, M. and Fisk, A. T. 2012. Biology of the Greenland shark Somniosus microcephalus. J. Fish. Biol. 80: 991-1018.
  161. LeClerc, L.-M., Lydersen, C., Haug, T., Bachmann, L., Fisk, A. T. and Kovacs, K. M. 2012. A missing piece in the Arctic food web puzzle? Stomach contents of Greenland sharks sampled in Svalbard, Norway. Polar Biol. 35: 1197-1208.
  162. Watanabe, Y. Y., Lydersen, C., Fisk, A. T. and Kovacs, K. M. 2012.The slowest fish: swim speed and tail-beat frequency of Greenland sharks. J. Exp. Mar. Biol. Ecol. 426-427: 5-11.
  163. Lydersen, C., Chernook, V. I., Glazov, D. M., Trukhanova, I. S. and Kovacs, K. M. 2012. Aerial survey of Atlantic walruses (Odobenus rosmarus rosmarus) in the Pechora Sea, August 2011. Polar Biol. 35: 1555-1562.
  164. Hindell, M. A., Lydersen, C., Hop, H. and Kovacs, K. M. 2012. Pre-partum diet of adult female bearded seals in years of contrasting ice conditions PLoS ONE 7(5): e38307 10pp.
  165. Harvey, V., Hammill, M. O., Swain, D. P., Breed, G. A., Lydersen, C. and Kovacs, K. M. 2012. Winter foraging by a top predator, the grey seal Halichoerus grypus, in relation to the distribution of prey. Mar. Ecol. Progr. Ser. 462: 273-286.
  166. Stafford, K. M., Moore, S. E., Berchok, C. L., Wiig, Ø., Lydersen, C., Hansen, E., Kalmbach, D. and Kovacs, K. M. 2012. Spitsbergen’s endangered bowhead whales sing through the polar night. Endang. Species Res. 18: 95-103.
  167. Fisk, A. T., Lydersen, C. and Kovacs,  K. M. 2012. Archival pop-off tag tracking of Greenland sharks (Somniosus microcephalus) in the High Arctic waters of Svalbard, Norway. Mar. Ecol. Progr. Ser. 468: 255-265.
  168. Blanchet, M.-A., Biuw, M., Hofmeyr, G. J. G., Bruyn, P. J. N.de, Lydersen, C. and Kovacs, K. M. 2013. At-sea behaviour of three krill predators breeding at Bouvetøya – Antarctic fur seals, macaroni penguins and chinstrap penguins. Mar. Ecol. Progr. Ser. 477: 285-302.
  169. Molde, K., Ciesielski, T., Fisk, A. T., Lydersen, C., Kovacs, K. M., Sørmo, E. G. and Jenssen, B. M. 2013. Associations between vitamins A and E and legacy POP levels in highly contaminated Greenland sharks (Somniosus microcephalus).  Sci. Total Environ. 442: 445-454.
  170. Castellote, M., Leeney, R,. H., O’Corry-Crowe, G., Lauhakangas, R., Kovacs, K. M., Lucey, W., Krasnova, V., Lydersen, C., Stafford, K. M. and Belikov, R. 2013. Monitoring white whales (Delphinapterus leucas) with echolocation loggers. Polar Biol. 36: 493-509.
  171. Iversen, M., Aars, J., Haug, T., Alsos, I. G., Lydersen, C., Bachmann, L. and Kovacs, K. M. 2013. The diet of polar bears (Ursus maritimus) from Svalbard, Norway, inferred from scat analysis. Polar Biol. 36: 561-571.
  172. McMeans, B. C., Arts, M. T., Lydersen, C., Kovacs, K. M., Hop, H., Falk-Petersen, S. and Fisk, A. T. 2013. The role of Greenland sharks (Somniosus microcephalus) in an arctic ecosystem – assessed via stable isotopes and fatty acids. Mar. Biol. 160: 1223-1238.
  173. Lydersen, C., Øien, N., Mikkelsen, B., Bober, S., Fisher, D. and Kovacs, K. M. 2013. A white humpback whale (Megaptera novaeangliae) in the Atlantic Ocean, Svalbard, Norway, August 2012. Polar Res. 32, 19739, doi: 10.3402/polar.v32i0.19739.
  174. Roth, S. J., Tischer, B. K., Kovacs, K. M., Lydersen, C., Osterrieder, N. and Tryland, M. 2013. Phocine herpesvirus 1 (PhHV-1) in harbor seals from Svalbard, Norway. Vet. Microbiol. 164: 286-292.
  175. Villanger, G. D., Gabrielsen, K. M., Kovacs, K. M., Lydersen, C., Lie, E., Karimi, M., Sørmo, E. G. and Jenssen, B. M. 2013. Effects of complex organohalogen contaminant mixtures on thyroid homeostasis in hooded seal (Cystophora cristata) mother-pup pairs. Chemosphere 92: 828-842.
  176. Merkel, B., Lydersen, C., Yoccoz, N. G. and Kovacs, K. M. 2013. The world’s northernmost harbour seal population – how many are there? PLoS ONE 8(7): e67576. 11pp.
  177. Roquet, F., Wunsch, C., Forget, G., Heimbach, P., Guinet, C., Reverdin, G., Charrassin, J.-B,. Bailleul, F., Costa, D. P., Huckstadt, L. A., Goetz, K. T., Kovacs, K. M., Lydersen, C., Biuw, M., Nøst, O. A., Bornemann, H., Ploetz, J., Bester, M. N., McIntyre, T., Muelbert, M. C., Hindell, M. A., McMahon, C. R. Williams, G., Harcourt, R., Field, I. C., Chafik, L., Nichols, K. W., Boehme, L. and Fedak, M. A. 2013. Estimates of the Southern Ocean general circulation improved by animal-borne instruments. Geophys. Res. Lett. 40: 6176-6180.
  178. Lydersen, C. and Kovacs, K. M. 2014. Walrus Odobenus rosmarus research in Svalbard, Norway, 2000-2010. NAMMCO Sci. Publ. 9: 175-190.
  179. Blanchet, M.-A., Lydersen, C., Biuw, M., Bruyn, P. J. N. de, Hofmeyr, G. Krafft, B. A. and Kovacs, K. M. 2014. Instrumentation and handling effects on Antarctic fur seals (Arctocephalus gazella). Polar Res. 33, 21630. doi: 10.3402/polar.v33.21630.
  180. Lydersen, C., Assmy, P., Falk-Petersen, S., Kohler, J., Kovacs, K. M., Reigstad, M., Steen, H., Strøm, H., Sundfjord, A., Varpe, Ø., Walczowski, W. Weslawski, J. M. and Zajaczkowski, M. 2014. The importance of tidewater glaciers for marine mammals and seabirds in Svalbard, Norway. J. Mar. Syst. 129: 452-471.
  181. Reeves, R. R., Ewins, P. J., Agbayani, S., Heide-Jørgensen, M. P., Kovacs, K. M., Lydersen, C., Suydam, R., Elliot, W., Polet, G., Dijk, Y. van and Blijleven, R. 2014. Distribution of endemic cetaceans in relation to hydrocarbon development and commercial shipping in a warming Arctic. Mar. Policy 44: 375-389.
  182. Hamilton, C. D., Lydersen, C., Ims, R. A. and Kovacs, K. M. 2014. Haul-out behaviour of the world’s northernmost population of harbour seals (Phoca vitulina) throughout the year. PLoS ONE 9(1): e86055. 15 pp.
  183. Lu, Z., Fisk, A., Kovacs, K., Lydersen, C., McKinney, M., Tomy, G., Rosenburg, B., McMeans, B., Muir, D., Wong, C. S. 2014. Temporal and spatial variation in polychlorinated biphenyl chiral signatures of the Greenland shark (Somniosus microcephalus) and its Arctic marine food web. Environ. Pollut.186: 216-225.
  184. Lowther, A. D., Lydersen, C., Biuw, M., Bruyn, P. J. de; Hofmeyr, J. G. and Kovacs, K. M. 2014. Post-breeding at-sea movements of three central place foragers in relation to submesoscale fronts in the Southern Ocean around Bouvetøya. Antarct. Sci. 26: 533-544.
  185. Zhou, Q., Hattermann, T., Nøst, O. A., Biuw, M., Kovacs, K. M. and Lydersen, C. 2014. Wind-driven spreading of fresh surface water beneath ice shelves in Eastern Weddell Sea. J. Geophys. Res. Oceans 119: 3818-3833.
  186. Blanchet, M.-A., Lydersen, C., Ims, R. A., Lowther, A. D. and Kovacs, K. M. 2014. Harbour seal (Phoca vitulina) movement patterns in the High Arctic archipelago of Svalbard, Norway. Aquat. Biol. 21: 167-181.
  187. Routti, H., Lydersen, C. Hansen, L. and Kovacs, K. M. 2014. Contaminant levels in the world’s northernmost harbor seals (Phoca vitulina). Mar. Pollut. Bull. 87: 140-146.
  188. Isachsen, P. E., Sørlie, S. R., Mauritzen, C., Lydersen, C., Dodd, P. and Kovacs, K. M. 2014. Upper-ocean hydrography of the Nordic Seas during the International Polar Year (2007-2008) as observed by instrumented seals and Argo floats. Deep-Sea Res. I 93: 41-59.
  189. Tverberg, V., Nøst, O. A., Lydersen, C. and Kovacs, K. M. 2014. Winter sea ice melting in the Atlantic Water subduction area, Svalbard Norway. J. Geophys. Res. Oceans 119: 5945-5967.
  190. Kovacs, K. M., Aars, J. and Lydersen, C. 2014. Walruses recovering after 60+ years of protection at Svalbard, Norway. Polar Res. 33, 26034, doi: 10.3402/polar.v33.26034.
  191. Grist, J. P., Josey, S. A., Boehme, L., Meredith, M. P., Laidre, K. L., Heide-Jørgensen, M. P., Kovacs, K. M., Lydersen, C., Davidson, F. J. M., Stenson, G. B., Hammill, M. O., Marsh, R. and Coward, A. C. 2014. Seasonal variability of the warm Atlantic Water layer in the vicinity of the Greenland shelf break. Geophys. Res. Lett. 41: 8530-8537.
  192. Falk-Petersen, S., Pavlov, V., Berge, J., Cottier, F., Kovacs, K. and Lydersen, C. 2015. At the rainbow’s end-productivity hotspots due to upwelling along Arctic shelves. Polar Biol. 38: 5-11.
  193. Hamilton, C. Kovacs, K. M. and Lydersen, C. 2015. Year-round haul-out behaviour of male walruses (Odobenus rosmarus) in the Northern Barents Sea. Mar. Ecol. Progr. Ser. 519: 251-263.
  194. Laidre, K. L., Angliss, R. P., Born, E. W., Boveng, P., Ferguson, S., Kovacs, K. M., Lowry, L., Lydersen, C., Moore, S., Quakenbush, L., Regehr, E. V., Stern, H., Ugarte, F., Vongraven, D. and Wiig, Ø. 2015. A circumpolar assessment of Arctic marine mammals, sea ice loss, and conservation challenges in the 21st century. Conserv. Biol. 29: 724-737.
  195. Lowther, A. D., Kovacs, K. M., Griffiths, D. and Lydersen, C. 2015. Identification of motivational state in adult male Atlantic walruses inferred from changes in movement and diving behavior. Mar. Mammal Sci. 31: 1291-1313.
  196. Lowther, A. D., Lydersen, C., Fedak, M. A., Lovell, P. and Kovacs, K. M. 2015. The Argos-CLS Kalman filter: error structures and state space modelling relative to Fastloc GPS data. PLoS ONE 10: e0124754. 16 pp.
  197. Blanchet, M.-A., Lydersen, C., Ims, R. A. and Kovacs, K. M. 2015. Seasonal, oceanographic and atmospheric drivers of diving behaviour in a temperate seal species living in the High Arctic. PLoS ONE 10: e0132686. 28 pp.
  198. Lowther, A. D., Lydersen, C. and Kovacs, K. M. 2015. A sum greater than its parts: merging multi-predator tracking studies to increase ecological understanding. Ecosphere 6, art. no.251, 1-13, doi: 10.1890/ES15-00293.1.
  199. Lowther, A. D., Ahonen, H., Hofmeyr, G., Oosthuizen, C. Bruyn, N. de, Lydersen, C. and Kovacs, K. 2015. The reliability of VHF telemetry data for measuring onshore attendance patterns of marine predators: a comparison with Time Depth Recorder data. Mar. Ecol. Progr. Ser. 538: 249-256.
  200. Hallanger, I., Sagerup, K., Evenset, A., Kovacs, K. M., Leonards, P., Fuglei, E., Routti, H., Strøm, H., Lydersen, C. and Gabrielsen, G. W. 2015. Organophosphorous flame retardants in biota from Svalbard, Norway. Mar. Pollut. Bull. 101: 442-447.
  201. Hamilton, C. D., Lydersen, C., Ims, R. A. and Kovacs, K. M. 2015. Predictions replaced by facts: a keystone species’ behavioural responses to declining arctic sea-ice. Biol. Lett. 11: art. no. 20150803, 6 pp.
  202. Hindell, M. A., McMahon, C. R., Bester, M. N., Boehme, L., Costa, D., Fedak, M. A., Guinet, C., Herraiz-Borreguero, L., Harcourt, R. A., Huckstadt, L., Kovacs, K. M., Lydersen, C., McIntyre, T., Muelbert, M., Patterson, T., Roquet, F., Williams, G. and Charrassin, J.-B. 2016. Circumpolar habitat use in the southern elephant seal: implications for foraging success and population trajectories. Ecosphere 7, e01213,1-27, doi 10.1002/ecs2.1213.
  203. Niemandt, C., Kovacs, K. M., Lydersen, C., Dyer, B. M., Isaksen, K., Mehlum, F, Hofmeyr, G. J. G. and Bruyn, P. J. N. de. 2016. Chinstrap and macaroni penguin diet and demography at Nyrøysa, Bouvetøya, Southern Ocean. Antarct. Sci. 28: 91-100.
  204. Hamilton, C. D., Lydersen, C., Ims, R.A. and Kovacs, K.  M. 2016. Coastal habitat use by ringed seals Pusa hispida following a regional sea-ice collapse: importance of glacial refugia in a changing Arctic. Mar. Ecol. Progr. Ser. 545: 261-277.
  205. Lindqvist, C., Roy, T., Lydersen, C., Kovacs, K., Aars, L., Wiig, Ø and Bachmann, L. 2016. Genetic diversity of historical Atlantic walruses (Odobenus rosmarus rosmarus) from Bjørnøya and Håøya (Tusenøyane), Svalbard, Norway. BMC Res. Notes  9:112, 1-8, doi: 10.1186/s13104-016-1907-8.
  206. Routti, H., Gabrielsen, G. W., Herzke, D., Kovacs, K. M. and Lydersen, C. 2016. Spatial and temporal trends in perfluoroalkyl substances (PFASs) in ringed seals (Pusa hispida) from Svalbard. Environ. Pollut. 214: 230-238.
  207. Lydersen, C., Fisk, A. T. and Kovacs. K. M. 2016. A review of Greenland shark (Somniosus microcephalus) studies in the Kongsfjorden area, Svalbard Norway. Polar Biol. 39: 2169-2178.
  208. Lowther, A. D. , Lydersen, C. and Kovacs, K. M. 2016. The seasonal evolution of shelf water masses around Bouvetøya, a subantarctic island in the mid-Atlantic sector of the Southern Ocean. Polar Res. 35, 28278, doi: 10.3402/polar.v35.28278.
  209. Blanchet, M.-A,, Lydersen, C., Ims, R. A. and Kovacs, K. M. 2016. Making it through the first year: ontogeny of movement and diving behavior of harbor seals from Svalbard, Norway. Mar. Mammal Sci. 32: 1340-1369.
  210. Tarroux, A., Lowther, A. D., Lydersen, C. and Kovacs, K.M. 2016. Temporal shift in the isotopic niche of female Antarctic fur seals from Bouvetøya. Polar Res. 35, 31335, doi: 10.3402/polar.v35.31335.
  211. Nyhus, E.S., Lindqvist, C., Kovacs; K.M., Lydersen, C., Wiig, Ø, and Bachmann, L. 2016. Mitogenomics of contemporary Spitsbergen stock bowhead whales (Balaena mysticetus). Mitochondrial DNA Part B: Resources 1: 898-900.
  212. Steeves, H. N., McMeans, B., Field, C., Stewart, C., Arts, M. T., Fisk, A. T., Lydersen, C., Kovacs, K. M. and MacNeil, M. A. 2017. Non-parametric analysis of the spatio-temporal variability in the fatty-acid profiles among Greenland sharks. J. Mar. Biol. Assoc. UK. in press.
  213. Grønnestad, R., Villanger, G., Polder, A., Kovacs, K.M., Lydersen, C., Jenssen, B. and Borgå, K. 2017. Maternal transfer of perfluoroalkyl substances in hooded seals. Environ. Toxicol. Chem. in press
  214. Descamps, S., Aars, J., Fuglei, E., Kovacs, K. M., Lydersen, C., Pavlova, O., Pedersen, A. Ø., Ravolainen, V. and Strøm, H. 2017. Climate change impacts on wildlife in Svalbard, High Arctic. Global Change Biol. 23: 490-502.
  215. Vacquié-Garcia, J., Lydersen, C., Marques, T. A., Aars, J., Ahonen, H., Skern-Mauritzen, M., Øien, N. and Kovacs, K. M. 2017. Late summer distribution and abundance of ice-associated whales in the Norwegian High Arctic. Endang. Species Res. 32: 59-70.
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Ole Jørgen Lønne

Associate Professor

UNIS – The University Centre in SvalbardSIOS – Svalbard Integrated Earth Observing System Work address UNIS – The University Centre in Svalbard Post box 156 Longyearbyen 9171 Norway Work Phone: +47 79 02 33 58