Quantifying the relative impact of hunting and oiling on Brünnich’s guillemots in the North-west Atlantic

  • Morten Frederiksen Department of Bioscience, Aarhus University, Roskilde, Denmark
  • Jannie F. Linnebjerg Department of Bioscience, Aarhus University, Roskilde, Denmark; Greenland Institute of Natural Resources, Nuuk, Greenland
  • Flemming R. Merkel Department of Bioscience, Aarhus University, Roskilde, Denmark; Greenland Institute of Natural Resources, Nuuk, Greenland
  • Sabina I. Wilhelm Environment and Climate Change Canada, Mount Pearl, Newfoundland and Labrador, Canada
  • Gregory J. Robertson Environment and Climate Change Canada, Mount Pearl, Newfoundland and Labrador, Canada
Keywords: CW Greenland Shelf, central-west Greenland Shelf (wintering area 2), SD, standard deviation, SW Greenland Shelf, south-west Greenland Shelf (wintering area 3)


Brünnich’s guillemot (Uria lomvia), or thick-billed murre, is an abundant pan-Arctic seabird, but several Atlantic breeding populations are declining. The species is subject to traditional harvest in the important wintering areas off west Greenland and Newfoundland, and has been subject to chronic oil pollution on the east coast of Canada. Until recently, knowledge of winter distribution has been insufficient to assess the impact of these mortality sources on specific breeding populations. We collate existing information on mortality from bag statistics in Greenland and Canada and studies of oiling off Newfoundland, as well as new data on age distribution in the harvest. Based on the results of recent tracking studies, we construct a spatially explicit population model that allocates hunting and oiling mortality to breeding populations and estimates the relative impact on their growth rate. Results indicate that annual population growth rate is depressed by 0.011–0.041 (approximately 1%–4%) by anthropogenic mortality sources. In addition to affecting local breeders, hunting in Greenland mainly affects declining breeding populations in Svalbard and Iceland, while hunting and oiling in Newfoundland mainly affect guillemots breeding in Arctic Canada and north-west Greenland, where most populations are relatively stable. The strongest relative impact is predicted on the small breeding population in Atlantic Canada, which winters mainly on the Newfoundland Shelf and therefore is exposed to both hunting and oiling. Our results clarify the relationships between hunting in Greenland and Canada and growth of specific breeding populations, and thus have major implications for harvest management of guillemots.


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Bakken V., Runde O. & Tjørve E. 2003. Norsk ringmerkingsatlas. (Norwegian bird ringing atlas.) Vol. 1. Stavanger, Norway: Stavanger Museum.

Byers T. & Dickson D.L. 2001. Spring migration and subsistence hunting of king and common eiders at Holman, Northwest Territories, 1996–98. Arctic 54, 122–134, http://dx.doi.org/10.14430/arctic771.

Cadiou B., Riffaut L., McCoy K.D., Cabelguen J., Fortin M., Gélinaud G., Le Roch A., Tirard C. & Boulinier T. 2004. Ecological impact of the “Erika” oil spill: determination of the geographic origin of the affected common guillemots. Aquatic Living Resources 17, 369–377, http://dx.doi.org/10.1051/alr:2004036.

Caswell H. 2001. Matrix population models. Construction, analysis, and interpretation. Sunderland, MA: Sinauer.

Descamps S., Strøm H. & Steen H. 2013. Decline of an Arctic top predator: synchrony in colony size fluctuations, risk of extinction and the subpolar gyre. Oecologia 173, 1271–1282, http://dx.doi.org/10.1007/s00442-013-2701-0.

Donaldson G.M., Gaston A.J., Chardine J.W., Kampp K., Nettleship D.N. & Elliot R.D. 1997. Winter distributions of thick-billed murres from the eastern Canadian Arctic and western Greenland in relation to age and time of year. Canadian Wildlife Service Occasional Papers 96. Ottawa: Environment Canada.

Elliot R.D., Collins B.T., Hayakawa E.G. & Metras L. 1991. The harvest of murres in Newfoundland from 1977–78 to 1987–88. In A.J. Gaston & R.D. Elliot (eds.): Studies of high-latitude seabirds. 2. Conservation biology of thick-billed murres in the Northwest Atlantic. Pp. 36–44. Ottawa: Canadian Wildlife Service.

Esler D. 2000. Applying metapopulation theory to conservation of migratory birds. Conservation Biology 14, 366–372, http://dx.doi.org/10.1046/j.1523-1739.2000.98147.x.

Falk K. & Durinck J. 1992. Thick-billed murre hunting in west Greenland. Arctic 45, 167–178, http://dx.doi.org/10.14430/arctic1390.

Fauchald P., Anker-Nilssen T., Barrett R.T., Bustnes J.O., Bårdsen B.-J., Christensen-Dalsgaard S., Descamps S., Engen S., Erikstad K.E., Hanssen S.A., Lorentsen S.-H., Moe B., Reiertsen T.K., Strøm H. & Systad G.H. 2015. The status and trends of seabirds breeding in Norway and Svalbard. NINA Report 1151. Tromsø: Norwegian Institute for Nature Research.

Fluhr J., Strøm H., Pradel R., Duriez O., Beaugrand G. & Descamps S. 2017. Weakening of the subpolar gyre as a key driver of North Atlantic seabird demography: a case study with Brünnich’s guillemots in Svalbard. Marine Ecology Progress Series 563, 1–11, http://dx.doi.org/10.3354/meps11982.

Frederiksen M., Descamps S., Erikstad K.E., Gaston A.J., Gilchrist H.G., Grémillet D., Johansen K.L., Kolbeinsson Y., Linnebjerg J.F., Mallory M.L., McFarlane Tranquilla L.A., Merkel F.R., Montevecchi W.A., Mosbech A., Reiertsen T.K., Robertson G.J., Steen H., Strøm H. & Thórarinsson T.L. 2016. Migration and wintering of a declining seabird, the thick-billed murre Uria lomvia, on an ocean basin scale: conservation implications. Biological Conservation 200, 26–35, http://dx.doi.org/10.1016/j.biocon.2016.05.011.

Frederiksen M., Moe B., Daunt F., Phillips R.A., Barrett R.T., Bogdanova M.I., Boulinier T., Chardine J.W., Chastel O., Chivers L.S., Christensen-Dalsgaard S., Clément-Chastel C., Colhoun K., Freeman R., Gaston A.J., González-Solís J., Goutte A., Grémillet D., Guilford T., Jensen G.H., Krasnov Y., Lorentsen S.-H., Mallory M.L., Newell M., Olsen B., Shaw D., Steen H., Strøm H., Systad G.H., Thórarinsson T.L. & Anker-Nilssen T. 2012. Multi-colony tracking reveals the winter distribution of a pelagic seabird on an ocean basin scale. Diversity and Distributions 18, 530–542, http://dx.doi.org/10.1111/j.1472-4642.2011.00864.x.

Frich A.S. 1997. Lomviefangst i Nuuk vinteren 1995/96. (Murre harvest in Nuuk, winter 1995/96.) Teknisk Rapport 4. Nuuk: Greenland Institute of Natural Resources.

Garðarsson A., Guðmundsson G.A. & Lilliendahl K. 2019. Svartfugl í íslenskum fuglabjörgum 2006–2008. (The numbers of large auks on the cliffs of Iceland in 2006–2008.) Bliki 33, 35–46.

Gaston A.J. & Hipfner J.M. 2000. Thick-billed murre (Uria lomvia). In A. Poole (ed.): The birds of North America online. Pp. 1–32. Ithaca: Cornell Lab of Ornithology, http://dx.doi.org/10.2173/bna.497.

Gaston A.J., Mallory M. & Gilchrist H.G. 2012. Populations and trends of Canadian Arctic seabirds. Polar Biology 35, 1221–1232, http://dx.doi.org/10.1007/s00300-012-1168-5.

Gaston A.J. & Robertson G.J. 2010. Trends in the harvest of Brünnich’s guillemots Uria lomvia in Newfoundland: effects of regulatory changes and winter sea ice conditions. Wildlife Biology 16, 47–55, http://dx.doi.org/10.2981/09-020.

Gaston A.J. & Robertson G.J. 2014. A review of thick-billed murre banding in the Canadian Arctic, 1950–2010. Arctic 67, 441–448, http://dx.doi.org/10.14430/arctic4419.

Gendron M.H. & Smith A.C. 2017. National Harvest Survey. Bird populations monitoring. Ottawa, Ontario: National Wildlife Research Centre, Canadian Wildlife Service. Accessed on the internet at http://ec.gc.ca/reom-mbs/enp-nhs/index.cfm?do=def&lang=e on 5 March 2018.

Gilliland S.G., Gilchrist H.G., Rockwell R.F., Robertson G.J., Savard J.P.L., Merkel F. & Mosbech A. 2009. Evaluating the sustainability of harvest among northern common eiders Somateria mollissima borealis in Greenland and Canada. Wildlife Biology 15, 24–36, http://dx.doi.org/10.2981/07-005.

Government of Canada 2017. Establishing national regulations for migratory game bird hunting: objectives and guidelines. Ottawa, Ontario: Canadian Wildlife Service. Accessed on the internet at https://www.canada.ca/en/environment-climate-change/services/migratory-game-bird-hunting/consultation-process-regulations/establishing-national-objectives-guidelines.html on 16 January 2019.

Harris M.P., Frederiksen M. & Wanless S. 2007. Within- and between-year variation in the juvenile survival of common guillemots Uria aalge. Ibis 149, 472–481, http://dx.doi.org/10.1111/j.1474-919X.2007.00667.x.

Linnebjerg J.F., Frederiksen M., Kolbeinsson Y., Snaethórsson A.Ö., Thórisson B. & Thórarinsson T.L. 2018. Non-breeding areas of three sympatric auk species breeding in three Icelandic colonies. Polar Biology 41, 1951–1961, http://dx.doi.org/10.1007/s00300-018-2334-1.

Lyngs P. 2003. Migration and winter ranges of birds in Greenland. An analysis of ringing recoveries. Dansk Ornitologisk Forenings Tidsskrift 97(1). Copenhagen: Danish Ornithological Society.

McFarlane Tranquilla L., Hedd A., Burke C., Montevecchi W.A., Regular P.M., Robertson G.J., Stapleton L.A., Wilhelm S.I., Fifield D.A. & Buren A.D. 2010. High Arctic sea ice conditions influence marine birds wintering in Low Arctic regions. Estuarine, Coastal and Shelf Science 89, 97–106, http://dx.doi.org/10.1016/j.ecss.2010.06.003.

Merkel F., Labansen A.L., Boertmann D., Mosbech A., Egevang C., Falk K., Linnebjerg J.F., Frederiksen M. & Kampp K. 2014. Declining trends in the majority of Greenland’s thick-billed murre (Uria lomvia) colonies 1981–2011. Polar Biology 37, 1061–1071, http://dx.doi.org/10.1007/s00300-014-1500-3.

Nevins H.M. & Carter H.R. 2003. Age and sex of common murres Uria aalge recovered during the 1997–98 Point Reyes tarball incidents in central California. Marine Ornithology 31, 51–58.

Péron G. 2013. Compensation and additivity of anthropogenic mortality: life-history effects and review of methods. Journal of Animal Ecology 82, 408–417, http://dx.doi.org/10.1111/1365-2656.12014.

Phillips R.A., Silk J.R.D., Croxall J.P., Afanasyev V. & Briggs D.R. 2004. Accuracy of geolocation estimates for flying seabirds. Marine Ecology Progress Series 266, 265–272, http://dx.doi.org/10.3354/meps266265.

Priest H. & Usher P.J. 2004. The Nunavut wildlife harvest study. Iqaluit, Nunavut: Nunavut Wildlife Management Board.

Robertson G.J., Ryan P.C., Dussureault J., Turner B.C., Wilhelm S.I. & Power K. 2006. Composition of beached marine birds from an oiling event in southeastern Newfoundland, November 2004. Marine Ornithology 34, 141–146.

Robertson G.J., Wiese F.K., Ryan P.C. & Wilhelm S.I. 2014. Updated numbers of murres and dovekies oiled in Newfoundland waters by chronic ship-source oil pollution. Proceedings of the 37th AMOP Technical Seminar on Environmental Contamination and Response. Pp. 265–275. Ottawa: Environment Canada.

SEAPOP 2018. Brünnich’s guillemots (Uria lomvia). Accessed on the internet at http://www.seapop.no/en/seatrack/#brunnichs-guillemot on 6 June 2019.

Smith P.A. & Gaston A.J. 2012. Environmental variation and the demography and diet of thick-billed murres. Marine Ecology Progress Series 454, 237–249, http://dx.doi.org/10.3354/meps09589.

Stubben C.J. & Milligan B.G. 2007. Estimating and analyzing demographic models using the popbio package in R. Journal of Statistical Software 22, 1–23, http://dx.doi.org/10.18637/jss.v022.i11.

Wiese F.K. 2002. Estimation and impacts of seabird mortality from chronic marine oil pollution off the coast of Newfoundland. PhD thesis, Dept. of Biology, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada

Wiese F.K. 2003. Sinking rates of dead birds: improving estimates of seabird mortality due to oiling. Marine Ornithology 31, 65–70.

Wiese F.K. & Jones, I.L. 2001. Experimental support for a new drift block design to assess seabird mortality from oil pollution. Auk 118, 1062–1068, http://dx.doi.org/10.2307/4089860.

Wiese F.K. & Robertson G.J. 2004. Assessing seabird mortality from chronic oil discharges at sea. Journal of Wildlife Management 68, 627–638, http://dx.doi.org/10.2193/0022-541X(2004)068[0627:ASMFCO]2.0.CO;2.

Wiese F.K., Robertson G.J. & Gaston A.J. 2004. Impacts of chronic marine oil pollution and the murre hunt in Newfoundland on thick-billed murre Uria lomvia populations in the eastern Canadian Arctic. Biological Conservation 116, 205–216, http://dx.doi.org/10.1016/S0006-3207(03)00191-5.

Wiese F.K. & Ryan P.C. 2003. The extent of chronic marine oil pollution in southeastern Newfoundland waters assessed through beached bird surveys 1984–1999. Marine Pollution Bulletin 46, 1090–1101, http://dx.doi.org/10.1016/s0025-326x(03)00250-9.

Wilhelm S. 2017. CWS: Waterbird colony database (Atlantic region). Version 1. OBIS Canada Digital Collections. Dartmouth, NS, Canada: Bedford Institute of Oceanography. Accessed on the internet on http:/ipt.iobis.org/obiscanada/resource?r=cws_atlantic_colonydbase on 18 April 2018.

Wilhelm S.I., Gilliland S.G., Robertson G.J., Ryan P.C. & Elliot R.D. 2008. Development and validation of a wing key to improve harvest management of alcids in the Northwest Atlantic. Journal of Wildlife Management 72, 1026–1034, http://dx.doi.org/10.2193/2007-232.
How to Cite
Frederiksen, M., Linnebjerg, J., Merkel, F., Wilhelm, S., & Robertson, G. (2019). Quantifying the relative impact of hunting and oiling on Brünnich’s guillemots in the North-west Atlantic. Polar Research, 38. https://doi.org/10.33265/polar.v38.3378
Research Articles