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Polar Biology

, Volume 30, Issue 4, pp 437–442 | Cite as

Satellite tracking and diving behaviour of sub-adult narwhals (Monodon monoceros) in Svalbard, Norway

  • Christian Lydersen
  • Anthony R. Martin
  • Ian Gjertz
  • Kit M. Kovacs
Original Paper

Abstract

Three juvenile narwhals captured during August 1998 in the northeast of Svalbard, Norway, were equipped with satellite-relayed data loggers (SRDLs) that transmitted diving and swim-speed data, in addition to location, for up to 46 days. A total of 1,354 complete dive cycles were recorded. Most of the diving was shallow and of short duration. Maximum recorded dive depth was 546 m, maximum recorded dive duration was 24.8 min, and maximum recorded swim-speed was 4.7 ms−1. Ascent speed, vertical ascent speed, descent speed and vertical descent speed were all significantly higher during deep dives (>200 m) than for shallow dives (<200 m). In addition both ascent and descent angles were much steeper for deep dives than during shallow dives. Most of the shallow diving seemed to be associated with travelling, with the animal shifting between various locations, while the deep diving (often to the bottom) for extended periods in some specific areas might have been associated with foraging. Even though the sample size in this study is small, the data are the first information available for movements and diving behaviour of narwhals near Svalbard.

Keywords

Depth Reading Diving Behaviour Dive Depth Deep Dive Tracking Period 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study was funded by the Norwegian Polar Institute and NERC’s Sea Mammal Research Unit (SMRU), University of St. Andrews, Scotland. We would like to thank H. Lund and Outi Dove for help during the fieldwork.

References

  1. ARGOS (1989) Guide to the Argos system. Argos CES, ToulouseGoogle Scholar
  2. Dietz R, Heide-Jørgensen MP (1995) Movements and swimming speed of narwhals, Monodon monoceros, equipped with satellite transmitters in Melville Bay, northwest Greenland. Can J Zool 73:2106–2119Google Scholar
  3. Dietz R, Heide-Jørgensen MP, Born EW, Glaher CM (1994) Occurrence of narwhals (Monodon monoceros) and white whales (Delphinapterus leucas) in East Greenland. Meddr Grønland Biosci 39:69–86Google Scholar
  4. Dietz R, Heide-Jørgensen MP, Richard PR, Aquarone M (2001) Summer and fall movements of narwhals (Monodon monoceros) from northeastern Baffin Island towards northern Davis Strait. Arctic 54:244–261Google Scholar
  5. Finley KJ, Gibb J (1982) Summer diet of the narwhal (Monodon monoceros) in Pond Inlet, northern Baffin Island. Can J Zool 60:3353–3363CrossRefGoogle Scholar
  6. Finley KJ, Miller GW, Davis RA, Greene CR (1990) Reactions of belugas, Delphinapterus leucas, and narwhals, Monodon monoceros, to ice-breaking ships in the Canadian High Arctic. Can Bull Fish Aquat Sci 224:97–117Google Scholar
  7. Gjertz I (1991) The narwhal, Monodon monoceros, in the Norwegian high Arctic. Mar Mammal Sci 7:402–408CrossRefGoogle Scholar
  8. Heide-Jørgensen MP (2002) Narwhal Monodon monoceros. In: Perrin WF, Würsig B, Thewissen JGM (eds) Encyclopedia of marine mammals. Acad Press, San Diego, pp 783–787Google Scholar
  9. Heide-Jørgensen MP, Dietz R (1995) Some characteristics of narwhal, Monodon monoceros, diving behaviour in Baffin Bay. Can J Zool 73:2120–2132Google Scholar
  10. Heide-Jørgensen MP, Dietz R, Leatherwood S (1994) A note on the diet of narwhals (Monodon monoceros) in Inglefield Bredning (NW Greenland). Meddr Grønl Biosci 39:213–216Google Scholar
  11. Heide-Jørgensen MP, Hammeken N, Dietz R, Orr J, Richard PR (2001) Surfacing times and dive rates for narwhals (Monodon monoceros) and belugas (Delphinapterus leucas). Arctic 54:284–298Google Scholar
  12. Heide-Jørgensen MP, Dietz R, Laidre KL, Richard PR (2002) Autumn movements, home ranges, and winter density of narwhals (Monodon monoceros) tagged in Tremblay Sound, Baffin Island. Polar Biol 25:331–341Google Scholar
  13. Heide-Jørgensen MP, Dietz R, Laidre KL, Richard PR, Orr J, Schmidt HC (2003) The migratory behaviour of narwhals (Monodon monoceros). Can J Zool 81:1298–1305CrossRefGoogle Scholar
  14. Laidre KL, Heide-Jørgensen MP (2005) Winter feeding intensity of narwhals (Monodon monoceros). Mar Mammal Sci 21:45–57CrossRefGoogle Scholar
  15. Laidre KL, Heide-Jørgensen MP, Dietz R (2002) Diving behaviour of narwhals (Monodon monoceros) at two localities in the Canadian high Arctic. Can J Zool 80:624–635CrossRefGoogle Scholar
  16. Laidre KL, Heide-Jørgensen MP, Dietz R, Hobbs RC, Jørgensen OA (2003) Deep-diving by narwhals Monodon monoceros: differences in foraging behavior between wintering areas? Mar Ecol Progr Ser 261:269–281Google Scholar
  17. Laidre KL, Heide-Jørgensen MP, Jørgensen OA, Treble MA (2004) Deep-ocean predation by a high Arctic cetacean. ICES J Mar Sci 61:430–440CrossRefGoogle Scholar
  18. Mansfield AW, Smith TG, Beck B (1975) The narwhal, Monodon monoceros, in eastern Canadian waters. J Fish Res Bd Can 32:1041–1046Google Scholar
  19. Martin AR, Kingsley MCS, Ramsay MA (1994) Diving behaviour of narwhals (Monodon monoceros) on their summer ground. Can J Zool 72:118–125Google Scholar
  20. McConnell BJ, Chambers C, Fedak MA (1992) Foraging ecology of southern elephant seals in relation to bathymetry and productivity of the Southern Ocean. Antarct Sci 4:393–398Google Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Christian Lydersen
    • 1
  • Anthony R. Martin
    • 2
  • Ian Gjertz
    • 3
  • Kit M. Kovacs
    • 1
  1. 1.Norwegian Polar InstituteTromsoNorway
  2. 2.BioSciences Division, British Antarctic SurveyCambridgeUK
  3. 3.Norwegian Research CouncilOsloNorway

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