Abstract
The aim of the current study was to identify maternity denning areas and to describe aspects of denning behaviour in polar bears (Ursus maritimus) in Svalbard, Norway. Den observations made during aerial and ground surveys (n = 553), observations of recently emerged family groups made during capture and tagging of bears (n = 206), and dens recorded by satellite telemetry (n = 76 dens) were used to describe the distribution of dens in the Barents Sea region. Data were collected during March, April, and May from 1972 to 2010, and while most dens were abandoned during the first 2 weeks of April, there was substantial variation. The highest number of dens was recorded on the islands in the eastern and northern parts of Svalbard with fewer dens found further west on the island Spitsbergen. Females with cubs-of-the-year or their tracks indicated some denning in southern, eastern, and northern parts of Spitsbergen. Telemetry also revealed that females captured in Svalbard and the Barents Sea den in Franz Josef Land, Russia. The majority of dens (62%) in Svalbard were located on land within ca. 1 km of the shore with the most inland den 19 km from shore. Heavy exploitation of polar bears before 1973, when a hunting moratorium was implemented, likely led to reduced denning in some areas. Our observations of den distribution indicate that denning is now more widespread in the archipelago than 50 years ago and reflects a reestablishment of denning areas following years of protection.
Similar content being viewed by others
References
Aars J, Marques TA, Buckland ST, Andersen M, Belikov S, Boltunov A, Wiig Ø (2009) Estimating the Barents Sea polar bear subpopulation size. Mar Mamm Sci 25:35–52
Amstrup SC (1993) Human disturbance of denning polar bears in Alaska. Arctic 46:246–250
Amstrup SC, Gardner C (1994) Polar bear maternity denning in the Beaufort Sea. J Wildl Manage 58:1–10
Belikov SE (1980) Distribution and structure of dens of female polar bears in Wrangel Island. In: Martinka CJ, McArthur KL (eds) Bears—their biology and management. US Gov Print Off, Washington DC, pp 117
Derocher AE (2005) Population ecology of polar bears at Svalbard, Norway. Popul Ecol 47:267–275
Derocher AE, Stirling I (1998) Maternal investment and factors affecting offspring size in polar bears (Ursus maritimus). J Zool 245:253–260
Derocher AE, Andriashek D, Arnould JPY (1993) Aspects of milk composition and lactation in polar bears. Can J Zool 71:561–567
Derocher AE, Wiig Ø, Andersen M (2002) Diet composition of polar bears in Svalbard and the western Barents Sea. Polar Biol 25:448–452
Derocher AE, Andersen M, Wiig Ø, Aars J, Hansen E, Biuw M (2010) Sea ice and polar bear den ecology at Hopen Island, Svalbard. Mar Ecol Prog Ser (in press)
Durner GM, Amstrup SC, Fischbach AS (2003) Habitat characteristics of polar bear terrestrial maternal den sites in northern Alaska. Arctic 56:55–62
Durner GM, Douglas DC, Nielson RM, Amstrup SC, McDonald TL, Stirling I, Mauritzen M, Born EW, Wiig Ø, DeWeaver E, Serreze MC, Belikov SE, Holland MM, Maslanik J, Aars J, Bailey DA, Derocher AE (2009) Predicting 21st-century polar bear habitat distribution from global climate models. Ecol Monogr 79:25–58
Ferguson S, Taylor M, Rosing-Asvid A, Born E, Messier F (2000) Relationships between denning of polar bears and conditions of sea ice. J Mamm 81:1118–1127
Fischbach AS, Amstrup SC, Douglas DC (2007) Landward and eastward shift of Alaskan polar bear denning associated with recent sea ice changes. Polar Biol 30:1395–1405
Hansson R, Thomassen J (1983) Behavior of polar bears with cubs in the denning area. Int Conf Bear Res and Manage 5:246–254
Harington CR (1968) Denning habits of the polar bear (Ursus maritimus Phipps). Can Wildl Serv Rep 5:1–30
Jonkel CJ, Kolenosky GB, Robertson R, Russell RH (1972) Further notes on polar bear denning habits. Int Conf Bear Res and Manage 2:142–158
Keating KA, Brewster WG, Key CH (1991) Satellite telemetry: performance of animal-tracking systems. J Wildl Manage 55:160–171
Larsen T (1985) Polar bear denning and cub production in Svalbard, Norway. J Wildl Manage 49:320–326
Larsen T (1986) Population biology in Svalbard polar bears (Ursus maritimus). PhD Thesis, University of Oslo, Norway
Lentfer JW (1975) Polar bear denning on drifting sea ice. J Mamm 56:716–718
Lentfer JW, Hensel RJ (1980) Alaskan polar bear denning. In: Martinka CJ, McArthur KL (eds) Bears—their biology and management. US Gov Print Off, Washington DC, pp 101–108
Lønø O (1970) The polar bear (Ursus maritimus Phipps) in the Svalbard area. Norsk Polarinstitutt Skrifter 149:1–115
Lydersen C, Gjertz I (1986) Studies of the ringed seal (Phoca hispida Schreber 1775) in its breeding habitat in Kongsfjorden, Svalbard. Polar Res 4:57–63
Mauritzen M, Derocher AE, Wiig Ø (2001) Space-use strategies of female polar bears in a dynamic sea ice habitat. Can J Zool 79:1704–1713
Messier F, Taylor MK, Ramsay MA (1992) Seasonal activity patterns of female polar bears (Ursus maritimus) in the Canadian Arctic as revealed by satellite telemetry. J Zool 226:219–229
Messier F, Taylor MK, Ramsay MA (1994) Denning ecology of polar bears in the Canadian Arctic Archipelago. J Mamm 75:420–430
Ovsyanikov N (1998) Den use and social interactions of polar bears during spring in a dense denning area on Herald Island, Russia. Ursus 10:251–258
Parovshchikov VJ (1964) A study on the population of the polar bear, Ursus (Thalarctos) maritimus Phipps, of Franz Josef Land. Acta Soc Zool Bohem 2:167–177
Prestrud P, Stirling I (1994) The International Polar Bear Agreement and the current status of polar bear conservation. Aquat Mamm 20:113–124
Ramsay MA, Dunbrack RL (1986) Physiological constraints on life-history phenomena: the example of small bear cubs at birth. Am Nat 127:735–743
Ramsay M, Stirling I (1986) On the mating system of polar bears. Can J Zool 64:2142–2151
Ramsay M, Stirling I (1990) Fidelity of female polar bears to winter den sites. J Mamm 71:233–236
Richardson E, Stirling I, Hik DS (2005) Polar bear (Ursus maritimus) maternity denning habitat in western Hudson Bay: a bottom-up approach to resource selection functions. Can J Zool 83:860–870
Scott PA, Stirling I (2002) Chronology of terrestrial den use by polar bears in western Hudson Bay as indicated by tree growth anomalies. Arctic 55:151–166
Smith TG (1980) Polar bear predation of ringed and bearded seals in the land-fast sea ice habitat. Can J Zool 58:2201–2209
Smith TG, 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
Stirling I, Andriashek D (1992) Terrestrial maternity denning of polar bears in the eastern Beaufort Sea area. Arctic 45:363–366
Stirling I, Archibald WR (1977) Aspects of predation of seals by polar bears. J Fish Res Board Can 34:1126–1129
Stirling I, Spencer C, Andriashek D (1989) Immobilization of polar bears (Ursus maritimus) with Telazol® in the Canadian Arctic. J Wildl Dis 25:159–168
Stroeve J, Holland MM, Meier W, Scambos T, Serreze M (2007) Arctic sea ice decline: faster than forecast. Geophys Res Lett 34:L09501
Tchernova J (2010) Denning characteristics and movement patterns of female polar bears with cubs in Svalbard during the first month after emergence: implication for detecting denning locations. Masters Thesis, University of Tromsø, Norway
Van de Velde F, Stirling I, Richardson E (2003) Polar bear (Ursus maritimus) denning in the area of the Simpson Peninsula, Nunavut. Arctic 56:191–197
Vinnikov KY, Robock A, Stouffer RJ, Walsh JE, Parkinson CL, Cavalieri DJ, Mitchell JFB, Garrett D, Zakharov VF (1999) Global warming and Northern Hemisphere Sea ice extent. Science 286:1934–1937
Watts PD, Hansen SE (1987) Cyclic starvation as a reproductive strategy in the polar bear. Symp Zool Soc Lond 57:305–318
Wiig Ø (1995) Distribution of polar bears (Ursus maritimus) in the Svalbard area. J Zool 237:515–529
Wiig Ø (1998) Survival and reproductive rates for the polar bears at Svalbard. Ursus 10:25–32
Zeyl E, Ehrich D, Aars J, Bachmann L, Wiig Ø (2010) Denning area fidelity and mitochondrial DNA diversity of female polar bears (Ursus maritimus) in the Barents Sea. Can J Zool 88:1139–1148
Acknowledgments
The Norwegian Polar Institute (NPI) provided funding for the study. We would like to thank Anders Skoglund at the Mapping Section, Norwegian Polar Institute, for help with maps and GIS analyses. We also thank the World Wildlife Fund for supporting the research programme.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Andersen, M., Derocher, A.E., Wiig, Ø. et al. Polar bear (Ursus maritimus) maternity den distribution in Svalbard, Norway. Polar Biol 35, 499–508 (2012). https://doi.org/10.1007/s00300-011-1094-y
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00300-011-1094-y