Polar Biology

, Volume 31, Issue 8, pp 905–911

Movements of two Svalbard polar bears recorded using geographical positioning system satellite transmitters

  • Magnus Andersen
  • Andrew E. Derocher
  • Øystein Wiig
  • Jon Aars
Original Paper

Abstract

Until recently, studies on polar bear (Ursus maritimus) movements and space use have used data collected by satellite telemetry collars that provided positions infrequently (typically weekly) and with low precision (by Doppler Shift method). A new generation of transmitters incorporated into collars use the Global Positioning System (GPS) to provide highly accurate positions, and have the ability to provide many positions per day. We used data from two GPS collars fitted to female polar bears, that attempted to collect six positions per day (4-h apart) for 546 days (from April 2000 to September 2001) and 413 days (from April 2000 to May 2001) to estimate how estimated speed of movement and home range size increase with increasing number of data points. Using all the positions, we estimated that the bears moved a minimum of 14.3 and 15.8 km per day on average. The fractal dimension (D) of the movement pathways for the two bears were D = 1.28 and 1.31, respectively, indicating low tortousity of the movements. Their minimum estimated annual home range areas were 20,794 and 112,183 km2. Simulations showed that a commonly used sampling regime of one location every 6th day would have significantly underestimated the movement rates and the home range sizes compared to our estimates. We also used the high accuracy of GPS positions to look at distances moved within 4-h periods. Maximum movement rate during a 4-h period for the two bears was 4.21 and 4.58 km/h, respectively. Variation in median values by month was significant (0.01 km/h in November for N23476 to 1.48 km/h in December for N7955). Diurnal variation was observed to differ between defined periods.

Keywords

Polar bear Satellite telemetry GPS-collar Movements Activity Svalbard 

References

  1. Amstrup SC, Durner GM, McDonald TL, Mulcahy DM, Garner GW (2001) Comparing the movement patterns of satellite tracked male and female polar bears. Can J Zool 79:2147–2158CrossRefGoogle Scholar
  2. Amstrup SD, Durner GM, Stirling I, Lunn NJ, Messier F (2000) Movements and distribution of polar bears in the Beaufort Sea. Can J Zool 78:948–966CrossRefGoogle Scholar
  3. Bell WJ (1991) Searching behaviour. The behavioural ecology of finding resources. Chapman & Hall, LondonGoogle Scholar
  4. Born EW, Wiig Ø, Thomassen J (1997) Seasonal and annual movements of radio-collared polar bears (Ursus maritimus) in Northeast Greenland. Jour Mar Syst 10:67–77CrossRefGoogle Scholar
  5. Chambers JM, Cleveland WS, Kleiner B, Tukey, PA (1983) Graphical methods for data analysis. Wadsworth & Brooks/ColeGoogle Scholar
  6. Ferguson S, Taylor M, Born E, Messier F (1998) Fractals, sea-ice landscape and spatial patterns of polar bears. J Biogeogr 25:1081–1092Google Scholar
  7. Ferguson S, Taylor M, Born E, Rosing-Asvid A, Messier F (2001) Activity and movement patterns of polar bears inhabiting consolidated versus active pack ice. Arctic 54:49–54Google Scholar
  8. Frair JL, Nielsen SE, Merrill EH, Lele SR, Boyce MS, Munro RHM, Stenhouse GB, Beyer HL (2004) Removing GPS collar bias in habitat selection studies. J Appl Ecol 41:201–212CrossRefGoogle Scholar
  9. Garner GW, Knick ST, Douglas DC (1990) Seasonal movements of adult female polar bears in the Bering and Chukchi Seas. Int Conf Bear Res Manage 8:219–226Google Scholar
  10. Gau RJ, Mulders R, Ciarniello LJ, Heard DC, Chetkiewicz CLB, Boyce M, Munro R, Stenhouse G, Chruszcz B, Gibeau ML, Milakovic B, Parker KL (2004) Uncontrolled field performance of Televilt GPS-simplex (Tm) collars on grizzly bears in western and northern Canada. Wildl Soc Bul 32:693–701CrossRefGoogle Scholar
  11. Girard I, Ouellet J-P, Courtois R, Dussault C, Breton L (2002) Effects of sampling effort based on GPS telemetry on home range size estimations. J Wildl Manage 66:1290–1300CrossRefGoogle Scholar
  12. Harris RB, Fancy SG, Douglas DC, Garner GW, Amstrup SC, McCabe TR, Pank LF (1990) Tracking wildlife by satellite: current systems and performance. US Fish Wildl Serv, Fish Wildl Tech Rep 30:1–52Google Scholar
  13. Ims RA (1995) Movement patterns related to spatial structures. In: Fahrig LH, Fahrig L, Merriam G (Eds) Mosaic landscapes and ecological Processes. Chapman & Hall, London, pp 85–109Google Scholar
  14. IUCN/SSC (1981) Proceedings of the 8th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, January 1981, p 67Google Scholar
  15. Johnson CJ, Heard DC, Parker KL (2002) Expectations and realities of GPS animal location collars: results of three years in the field. Wildl Biol 8:153–159Google Scholar
  16. Larsen T, Jonkel C, Vibe C (1983) Satellite radio-tracking of polar bears between Svalbard and Greenland. Int Conf Bear Res and Manage 5:230–237Google Scholar
  17. Mauritzen M (2002) Patterns and processes in female polar bear space-use. PhD-Thesis, University of Oslo, NorwayGoogle Scholar
  18. Mauritzen M, Derocher AE, Wiig Ø (2001) Female polar bear space use strategies in a dynamic sea ice habitat. Can J Zool 79:1704–1713CrossRefGoogle Scholar
  19. McConnell BJ, Fedak MA, Lovell P, Hammond PS (1999) Movements and foraging areas of grey seals in the North Sea. J Appl Ecol 36:573–590CrossRefGoogle Scholar
  20. Messier F, Taylor M, Ramsay M (1992) Seasonal activity patterns of female polar bears (Ursus maritimus) in the Canadian Arctic revealed by satellite telemetry. J Zool 226:219–229Google Scholar
  21. Morales JM, Haydon DT, Frair J, Holsiner KE, Fryxell JM (2004) Extracting more out of relocation data: building movement models as mixtures of random walks. Ecology 85:2436–2445CrossRefGoogle Scholar
  22. Parks EK, Derocher AE, Lunn NJ (2006) Seasonal and annual movement patterns of polar bears on the sea ice of Hudson Bay. Can J Zool 84:1281–1294CrossRefGoogle Scholar
  23. Stirling I (1974) Midsummer observations on behavior of wild polar bears (Ursus maritimus). Can J Zool 52:1191–1198Google Scholar
  24. Stirling I, Spencer C, Andriashek D (1989) Immobilization of polar bears (Ursus maritimus) with Telazol® in the Canadian Arctic. J Wildl Dis 25:159–168PubMedGoogle Scholar
  25. Vincent C, McConnell BJ, Ridoux V, Fedak MA (2002) Assessment of Argos location accuracy from satellite tags deployed on captive gray seals. Mar Mamm Sci 18:156–166CrossRefGoogle Scholar
  26. Wiig Ø (1995) Distribution of polar bears (Ursus maritimus) in the Svalbard area. J Zool 237:515–529CrossRefGoogle Scholar
  27. Wiig Ø, Born EW, Pedersen LT (2003) Movements of female polar bears (Ursus Maritimus) in the East Greenland pack ice. Polar Biol 26:509–516CrossRefGoogle Scholar
  28. Yasuda T, Arai N (2005) Fine-scale tracking of marine turtles using GPS-Argos PTTs. Zool Sci 22:547–553PubMedCrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Magnus Andersen
    • 1
  • Andrew E. Derocher
    • 1
    • 2
  • Øystein Wiig
    • 3
  • Jon Aars
    • 1
  1. 1.Norwegian Polar InstituteTromsøNorway
  2. 2.Department of Biological SciencesUniversity of AlbertaEdmontonCanada
  3. 3.Natural History MuseumUniversity of OsloOsloNorway

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