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Polar Biology

, Volume 34, Issue 1, pp 95–99 | Cite as

Food transit times in captive leopard seals (Hydrurga leptonyx)

  • Sophie Hall-Aspland
  • Tracey Rogers
  • Rhondda Canfield
  • Joy Tripovich
Original Paper

Abstract

The passage rate of food through the alimentary tract of three captive, female leopard seals (Hydrurga leptonyx) was assessed. Seals were housed during winter in holding pools with access to water to reduce factors affecting digestion. Three different marker types were used; large and small beads and TiO2. Animals were checked hourly, and sample collections continued for 270 h after dosing. Individual differences in transit and mean retention times were observed, possibly reflecting inter-digestive emptying times of the stomach and small intestine. Age differences and activity levels may also have been a factor. Leopard seals displayed extended food transit times similar to terrestrial carnivores instead of other pinnipeds. This result suggests an adaptation of digestive system to cope with the opportunistic diet and range of prey types consumed.

Keywords

Beads Complex diet Extended Passage rate Poisson distribution TiO2 

Notes

Acknowledgments

This project was approved by the Animal Care and Ethics Committee of the Zoological Parks Board of NSW. The authors would like to thank the following; the members of the Marine Mammal Department, Zoological Parks Board of NSW, especially A. Barnes who assisted with the sample collection, S. Pickering, Pet Porpoise Pool, Coffs Harbour for organising the trials and collecting the data, K. Collins for assistance with the sample preparation and I. van Ekris and A. Trube from the Veterinary Faculty, University of Sydney who provided advice and assistance with the spectrometry. J. Forcada and R. Casaux provided comments which greatly improved the manuscript. A Hall provided statistical advice, and funding was provided by the Winifred Scot Foundation.

References

  1. Best RC (1985) Digestibility of ringed seals by the polar bear. Can J Zool 63:1033–1036CrossRefGoogle Scholar
  2. Bigg MA, Fawcett I (1985) Two biases in diet determination of northern fur seals (Callorhinus ursinus). In: Beddington JR, Beverton RJH, Lavigne DM (eds) Marine mammals and fisheries. Allen and Unwin, London, pp 284–291Google Scholar
  3. Blaxter KL, Graham NM, Wainman FW (1956) Some observations on the digestibility of food by sheep, and on related problems. Br J Nutr 10:69–91CrossRefPubMedGoogle Scholar
  4. Bodley KB, Mercer JR, Bryden MM (1999) Rate of passage of digesta through the alimentary tract of the New Zealand fur seals (Arctocephalus forsteri) and the Australian sea lion (Neophoca cinerea) (Carnivora: Otariidae). Aust J Zool 47:193–198CrossRefGoogle Scholar
  5. Fea N, Harcourt R (1997) Assessing the use of faecal and regurgitate analysis as a means of determining the diet of New Zealand fur seals. In: Hindell M, Kemper C (eds) Marine mammal research in the southern hemisphere. vol 1: Status, ecology and medicine. Surrey Beatty & Sons, Chipping Norton, pp 143–150Google Scholar
  6. Goodman-Lowe GD, Atkinson S, Carpenter JR (1997) Initial defacation time and rate of passage of digesta in adult Hawaiian monk seals, Monachus schauinslandi. Can J Zool 75:433–438CrossRefGoogle Scholar
  7. Green K, Williams R (1986) Observations on the food remains in faeces of elephant, leopard and crabeater seals. Polar Biol 6:43–45CrossRefGoogle Scholar
  8. Hall-Aspland SA, Rogers TL (2004) Summer diet of leopard seals in Prydz Bay, Eastern Antarctica. Polar Biol 27(12):729–734CrossRefGoogle Scholar
  9. Helm RC (1983) Intestinal length of three California pinniped species. J Zool (London) 199:277–304Google Scholar
  10. Helm RC (1984) Rate of digestion in three species of pinnipeds. Can J Zool 62:1751–1756CrossRefGoogle Scholar
  11. Kotb AR, Luckey TD (1972) Markers in nutrition. Nutr Abs Rev 42(3):813–845Google Scholar
  12. Krockenberger MB, Bryden MM (1994) Rate of passage of digesta through the alimentary tract of southern elephant seals (Mirounga leonina) (Carnivora: Phocidae). J Zool (London) 234:229–237CrossRefGoogle Scholar
  13. Lanyon JM, Marsh H (1995) Digesta passage times in the dugong. Aust J Zool 43:119–127CrossRefGoogle Scholar
  14. Larkin ILV, Fowler VFF, Reep RL (2007) Digesta passage rates in the Florida Manatee (Trichechus manatus latirostris). Zoo Biol 26(6):506–515CrossRefGoogle Scholar
  15. Markusson NK (1993) Transit time of digesta in captive harbour seals (Phoca vitulina). Can J Zool 71:1071–1073CrossRefGoogle Scholar
  16. Mårtensson P, Nordoy ES, Messelt EB, Blix AS (1998) Gut length, food transit time and diving habit in phocid seals. Polar Biol 20:213–217CrossRefGoogle Scholar
  17. Øritsland T (1977) Food consumption of seals in the Antarctic pack-ice. In: Llano GA (ed) Adaptations within Antarctic ecosystems. Proceedings of the 3rd SCAR symposium on Antarctic biology. Smithsonian Institute, Washington, DC, pp 749–768Google Scholar
  18. Perrin MR (1994) Herbivory and niche partitioning. In: Chivers DJ, Langer P (eds) The digestive system in mammals; food, form and function. Cambridge University Press, Cambridge, pp 128–149Google Scholar
  19. Richardson KC, Gales NJ (1987) Functional morphology of the alimentary tract of the Australian sea lion (Neophoca cinerea). Aust J Zool 35:219–226CrossRefGoogle Scholar
  20. Russell RH (1975) The food habits of polar bears of James Bay and southwest Hudson Bay in summer and autumn. Arctic 28:117–129Google Scholar
  21. Short FJ, Gorton P, Wiseman J, Boorman KN (1996) Determination of titanium dioxide added as an inert marker in chicken digestibility studies. Anim Feed Sci Tech 59:215–221CrossRefGoogle Scholar
  22. Siniff DB, Bengston JL (1977) Observations and hypothesis concerning the interactions among crabeater seals, leopard seals and killer whales. J Mamm 58(3):414–415CrossRefGoogle Scholar
  23. Staniland IJ (2002) Investigating the biases in the use of hard prey remains to identify diet composition using Antarctic fur seals (Arctocephalus gazella) in captive feeding trials. Mar Mamm Sci 18(1):223–243CrossRefGoogle Scholar
  24. Trumble SJ, Castellini MA (2005) Diet mixing in an aquatic carnivore, the harbour seal. Can J Zool 83:851–859CrossRefGoogle Scholar
  25. Vogel AI (1961) A textbook of quantitative inorganic analysis, 3rd edn. Longmans, Green and Co., LondonGoogle Scholar
  26. Warner ACI (1981) Rate of passage of digesta through the gut of mammals and birds. Nutr Abs Rev 51(12):789–820Google Scholar
  27. Williams TM, Haun J, Davis RW, Fuiman LA, Kohin S (2001) A killer appetite, metabolic consequences of carnivory in marine mammals. Compar Biochem Physiol A 129:785–796CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Sophie Hall-Aspland
    • 1
    • 2
    • 3
    • 5
  • Tracey Rogers
    • 1
    • 2
    • 4
  • Rhondda Canfield
    • 1
  • Joy Tripovich
    • 1
    • 2
  1. 1.Faculty of Veterinary ScienceUniversity of SydneySydneyAustralia
  2. 2.Australian Marine Mammal Research Centre, Zoological Parks Board NSW/Faculty of Veterinary ScienceUniversity of SydneyMosmanAustralia
  3. 3.School of Animal and Veterinary ScienceCharles Sturt UniversityWagga WaggaAustralia
  4. 4.School of Biological, Earth and Environmental SciencesUniversity of NSWSydneyAustralia
  5. 5.Batchelor Institute of Indigenous Tertiary EducationNhulunbuy, East Arnhem LandAustralia

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