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Polar Biology

, Volume 33, Issue 4, pp 433–441 | Cite as

Remarkable development of diving performance and migrations of hooded seals (Cystophora cristata) during their first year of life

  • Lars P. FolkowEmail author
  • Erling S. Nordøy
  • Arnoldus S. Blix
Original Paper

Abstract

Newborn hooded seals (Cystophora cristata) have smaller weight-specific oxygen stores than adults, but nothing is known about how this affects their diving behaviour. Here, we present data on the diving behaviour and migrations of seven weaned hooded seal pups of the Greenland Sea stock during their first year of life, as collected by use of satellite telemetry. The pups started diving 1–2 days after tagging, and during a tracking period of 25–398 days they dispersed over vast areas of the Greenland and Norwegian Seas in a manner similar to adults. The initial development of diving depths and durations in April–May was rapid, and pups reached depths of >100 m and dived for >15 min within 3 weeks of age. During early summer (May–June) this development was temporarily discontinued, to be resumed throughout autumn and winter, during which time maximum depths and durations of >700 m and >30 min, respectively, were reached. Depths and durations were significantly related to age/season, location and time of day. The dive behaviour in early summer, with relatively shallow and short dives without diurnal variations, resembles that of adults and probably reflects the vertical distribution of prey rather than physiological constraints. Dives of pups were nevertheless shallower and shorter than those of adults, but relative to body mass both hooded seal pups and adults display a remarkable diving capacity which makes the species particularly suited for studies of defence mechanisms against hypoxia insult in mammals.

Keywords

Satellite tracking Pinnipeds Juvenile Immature Oxygen stores Diving depth Diving duration Migration 

Notes

Acknowledgments

Thanks to the crews of R/V “Jan Mayen” for assistance in the field, and to Are Verlo Olsen for help with data analyses. This study was funded in part by grants from the Nansen Foundation (Norwegian Academy of Sciences and Letters), grant #62/2007, and from the Roald Amundsen Center of Arctic Research, University of Tromsø. The experiments described in the present study comply with the current laws of the countries in which they were performed (Norway, Denmark/Greenland).

Conflict of interest statement

The authors declare that they have no conflict of interest.

References

  1. Anonymous (1996) User’s manual 1.0 CLS/Service Argos, ToulouseGoogle Scholar
  2. Bowen WD, Oftedal O, Boness DJ (1985) Birth to weaning in 4 days: remarkable growth in the hooded seal, Cystophora cristata. Can J Zool 63:2841–2846CrossRefGoogle Scholar
  3. Burns JM (1999) The development of diving behavior in juvenile Weddell seals: pushing physiological limits in order to survive. Can J Zool 77:737–747CrossRefGoogle Scholar
  4. Burns JM, Lestyk K, Folkow LP, Hammill MO, Blix AS (2007) Size and distribution of oxygen stores in harp and hooded seals from birth to maturity. J Comp Physiol B 177:687–700CrossRefPubMedGoogle Scholar
  5. Fedak MA, Anderson SS, Curry MG (1983) Attachment of a radio tag to the fur of seals. J Zool Lond 200:298–300CrossRefGoogle Scholar
  6. Folkow LP, Blix AS (1995) Distribution and diving behaviour of hooded seals. In: Blix AS, Walløe L, Ulltang Ø (eds) Whales, seals, fish and man. Elsevier, Amsterdam, pp 193–202Google Scholar
  7. Folkow LP, Blix AS (1999) Diving behaviour of hooded seals (Cystophora cristata) in the Greenland and Norwegian Seas. Polar Biol 22:61–74CrossRefGoogle Scholar
  8. Folkow LP, Mårtensson P-E, Blix AS (1996) Annual distribution of hooded seals (Cystophora cristata) in the Greenland and Norwegian Seas. Polar Biol 16:169–179CrossRefGoogle Scholar
  9. Folkow LP, Nordøy ES, Blix AS (2004) Distribution and diving behaviour of harp seals (Pagophilus groenlandicus) from the Greenland Sea stock. Polar Biol 27:281–298CrossRefGoogle Scholar
  10. Folkow LP, Ramirez J-M, Ludvigsen S, Ramirez N, Blix AS (2008) Remarkable neuronal hypoxia tolerance in the deep-diving adult hooded seal (Cystophora cristata). Neurosci Lett 446:147–150CrossRefPubMedGoogle Scholar
  11. Gjertz I, Kovacs KM, Lydersen C, Wiig O (2000) Movements and diving of bearded seal (Erignathus barbatus) mothers and pups during lactation and post-weaning. Polar Biol 23:559–566CrossRefGoogle Scholar
  12. Haug T, Nilssen KT, Lindblom L (2000) First independent feeding of harp seal (Phoca groenlandica) and hooded seal (Cystophora cristata) pups in the Greenland Sea. NAMMCO Sci Publ 2:29–39Google Scholar
  13. Hindell MA, McConnell B, Fedak MA, Slip DJ, Burton HR, Reijnders PJH, McMahon CR (1999) Environmental and physiological determinants of successful foraging by naïve southern elephant seal pups during their first trip to sea. Can J Zool 77:1807–1821CrossRefGoogle Scholar
  14. Le Boeuf BJ, Morris PA, Blackwell SB, Crocker DE, Costa DP (1996) Diving behavior of juvenile northern elephant seals. Can J Zool 74:1632–1644CrossRefGoogle Scholar
  15. Lestyk KC, Folkow LP, Blix AS, Hammill MO, Burns JM (2009) Development of myoglobin concentration and acid buffering capacity in harp (Pagophilus groenlandicus) and hooded (Cystophora cristata) seals from birth to maturity. J Comp Physiol B. doi: 10.1007/s00360-009-0378-9
  16. Nordøy ES, Folkow LP, Potelov V, Prischemikhin V, Blix AS (2008) Seasonal distribution and dive behaviour of harp seals (Pagophilus groenlandicus) of the White Sea–Barents Sea stock. Polar Biol 31:1119–1135CrossRefGoogle Scholar
  17. Ramirez J-M, Folkow LP, Blix AS (2007) Hypoxia tolerance in mammals and birds: from the wilderness to the clinic. Annu Rev Physiol 69:113–143CrossRefPubMedGoogle Scholar
  18. Rasmussen B (1960) On the hooded seal stock in the North Atlantic Ocean. Fisken Havet 1:1–23 (in Norwegian)Google Scholar
  19. Williams TM, Kooyman GL (1985) Swimming performance and hydrodynamic characteristics of harbor seals Phoca vitulina. Physiol Zool 58:576–589Google Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Lars P. Folkow
    • 1
    Email author
  • Erling S. Nordøy
    • 1
  • Arnoldus S. Blix
    • 1
  1. 1.Department of Arctic BiologyUniversity of TromsøTromsöNorway

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