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Spatial variation in female southern elephant seal mass change assessed by an accurate non-invasive photogrammetry method

Published online by Cambridge University Press:  10 April 2013

Martin Postma ,
Marthán N. Bester  and
P.J. Nico De Bruyn
Martin Postma*
Affiliation:
Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
Marthán N. Bester
Affiliation:
Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
P.J. Nico De Bruyn
Affiliation:
Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
*
[email protected]
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Abstract

Physically weighing large marine mammals sequentially over time has presented researchers with a logistical challenge and has severely limited sample sizes. Using a well-established photogrammetry method we developed a simple mathematical method to calculate accurate mass measurements at specific stages in the life cycle of a top marine predator. Female southern elephant seals (n = 23) at Marion Island were sampled sequentially using photogrammetry and three-dimensional models (based on each photogrammetry project) were built for estimation of body mass. Simple equations were applied to obtain mass at critical instances in their life cycle. Marion Island elephant seal mass data was compared to data obtained from physically weighed elephant seals from King George, South Georgia and Macquarie islands. Females from Marion Island are smaller, but their percentage lactation mass loss is similar to females from these other populations. The similarity of percentage mass loss during lactation between different female populations illustrates the accuracy and practicality of the photogrammetric method over a temporal scale. Photogrammetric mass estimation can be used alongside datasets of physically weighed animals and can greatly benefit ecology and life history studies.

Keywords

breeding seasonlife history theorymethodology advancementMirounga leoninamoultpelagic foraging
Type
Biological Sciences
Information
Antarctic Science , Volume 25 , Issue 6 , December 2013 , pp. 731 - 740
Copyright
Copyright © Antarctic Science Ltd 2013 

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References

Arnbom, T.R., Fedak, M.A. Boyd, I.L. 1997. Factors affecting maternal expenditure in southern elephant seals during lactation. Ecology, 78, 471–483.CrossRefGoogle Scholar
Baker, W.H. 1960. Elements of photogrammetry. New York: Ronald Press, 199 pp.Google Scholar
Bergmann, C. 1847. Über die Verhältnisse der Warmeokonomie der Tiere zu ihrer Grosse. Göttinger Studien, 3, 595–708.Google Scholar
Bornemann, H., Kreyscher, M., Ramdorhr, S., Martin, T., Carlini, A., Sellmann, L. Plötz, J. 2000. Southern elephant seal movement and Antarctic sea ice. Antarctic Science, 12, 3–15.Google Scholar
Boyd, I.L. Croxall, L.P. 1996. Dive durations in pinnipeds and seabirds. Canadian Journal of Zoology, 74, 1696–1705.Google Scholar
Boyd, I.L. McCann, T.S. 1989. Prenatal investment in reproduction by female Antarctic fur seals. Behavioural Ecology and Sociobiology, 24, 377–385.Google Scholar
Boyd, I.L., Arnbom, T.R. Fedak, M.A. 1993. Water flux, body composition, and metabolic rate during moult in female southern elephant seals (Mirounga leonina). Physiological Zoology, 66, 43–60.Google Scholar
Carlini, A.R., Marquez, M.E.I., Daneri, G.A. Poljak, S. 1999. Mass changes during their annual cycle in females of southern elephant seals at King George Island. Polar Biology, 21, 234–239.Google Scholar
Carlini, A.R., Daneri, G.A., Marquez, M.E.I., Soave, G.E. Poljak, S. 1997. Mass transfer from mothers to pups and mass recovery by mothers during the post-breeding foraging period in southern elephant seals (Mirounga leonina) at King George Island. Polar Biology, 18, 305–310.Google Scholar
Carlini, A.R., Marquez, M.E.I., Panarello, H., Ramdohr, S., Daneri, G.A., Bornemann, H. Plötz, J. 2004. Lactation costs in southern elephant seals at King George Island, South Shetland Islands. Polar Biology, 27, 266–276.Google Scholar
Condy, P.R. 1978. The distribution and abundance of southern elephant seals Mirounga leonina (Linn.) on the Prince Edward Islands. South African Journal of Antarctic Research, 8, 42–48.Google Scholar
De Bruyn, P.J.N., Bester, M.N., Carlini, A.R. Oosthuizen, W.C. 2009. How to weigh an elephant seal with one finger: a simple three-dimensional photogrammetric application. Aquatic Biology, 5, 31–39.Google Scholar
De Bruyn, P.J.N., Tosh, C.A., Oosthuizen, W.C., Phalanndwa, M.V. Bester, M.N. 2008. Temporary marking of unweaned southern elephant seal (Mirounga leonina L.) pups. South African Journal of Wildlife Research, 38, 133–137.CrossRefGoogle Scholar
De Bruyn, P.J.N., Tosh, C.A., Bester, M.N., Cameron, E.Z., McIntyre, T. Wilkinson, I.S. 2011. Sex at sea: alternative mating system in an extremely polygynous mammal. Animal Behaviour, 82, 445–451.CrossRefGoogle Scholar
Fedak, M.A., Arnbom, T. Boyd, I.L. 1996. The relation between the size of southern elephant seal mothers, the growth of their pups, and the use of maternal energy, fat, and protein during lactation. Physiological Zoology, 69, 887–911.Google Scholar
Fedak, M.A., Arnbom, T.A., McConnell, B.J., Chambers, C., Boyd, I.L., Harwood, J. McCann, T.S. 1994. Expenditure, investment, and acquisition of energy in southern elephant seals. In Le Boeuf, B.J. & Laws, R.M., eds. Elephant seals: population ecology, behaviour, and physiology. Berkeley, CA: University of California Press, 354–373.CrossRefGoogle Scholar
Hindell, M.A., Slip, D.J. Burton, H.R. 1994. Body mass loss of moulting female southern elephant seals, Mirounga leonina, at Macquarie Island. Polar Biology, 14, 275–278.CrossRefGoogle Scholar
Hindell, M.A., Lea, M.A., Morrice, M.G. McMahon, C.R. 2000. Metabolic limits on dive duration and swimming speed in the southern elephant seal Mirounga leonina . Physiological and Biochemical Zoology, 73, 790–798.Google Scholar
Huston, M.A. Wolverton, S. 2011. Regulation of animal size by eNPP, Bergmann's rule, and related phenomena. Ecological Monographs, 81, 349–405.Google Scholar
Kirkman, S.P., Bester, M.N., Hofmeyr, G.J.G., Jonker, F.C., Pistorius, P.A., Owen, R. Strydom, N. 2004. Variation in the timing of the breeding haulout of female southern elephant seals at Marion Island. Australian Journal of Zoology, 52, 379–388.Google Scholar
Kirkman, S.P., Bester, M.N., Pistorius, P.A., Hofmeyr, G.J.G., Jonker, F.C., Owen, R. Strydom, N. 2003. Variation in the timing of moult in Southern Elephant seals at Marion Island. South African Journal of Wildlife Research, 33, 79–84.Google Scholar
Kleiber, M. 1947. Body size and metabolic rate. Physiological Review, 27, 511–541.Google Scholar
Laws, R.M. 1994. History and present status of southern elephant seal populations. In Le Boeuf, B.J. & Laws, R.M., eds. Elephant seals: population ecology, behaviour and physiology. Berkeley, CA: University of California Press, 49–65.Google Scholar
Le Boeuf, B.J. Laws, R.M. 1994. Elephant seals: population ecology, behaviour and physiology. Berkeley, CA: University of California Press, 414 pp.Google Scholar
Lebreton, J., Burnham, K.P., Clobert, J. Anderson, D.R. 1992. Modelling survival and testing biological hypotheses using marked animals: a unified approach with case studies. Ecological Monographs, 62, 67–118.Google Scholar
McCann, T.S., Fedak, M.A. Harwood, J. 1989. Parental investment in southern elephant seals, Mirounga leonina . Behavioural Ecological and Sociobiology, 25, 81–87.Google Scholar
McConnell, B.J. Fedak, M.A. 1996. Movements of southern elephant seals. Canadian Journal of Zoology, 74, 1485–1496.Google Scholar
McIntyre, T., De Bruyn, P.J.N., Ansorge, I.J., Bester, M.N., Bornemann, H., Plötz, J. Tosh, C.A. 2010. A lifetime at depth: vertical distribution of southern elephant seals in the water column. Polar Biology, 33, 1037–1048.Google Scholar
McMahon, C.R., Burton, H.R. Bester, M.N. 2000. Weaning mass and the future survival of southern elephant seals, Mirounga leonina, at Macquarie Island. Antarctic Science, 12, 149–153.Google Scholar
McMahon, C.R., Burton, H.R. Bester, M.N. 2003. A demographic comparison of two southern elephant seal populations. Journal of Animal Ecology, 72, 61–73.Google Scholar
McMahon, C.R., Bester, M.N., Burton, H.R., Hindell, M.A. Bradshaw, C.J.A. 2005. Population status, trends and a re-examination of the hypotheses explaining the recent declines of the southern elephant seal Mirounga leonina . Mammal Review, 35, 82–100.Google Scholar
Pakhomov, E.A. Chown, S.L. 2003. The Prince Edward Islands: Southern Ocean oasis. Ocean Yearbook, 17, 348–379.Google Scholar
Pistorius, P.A., De Bruyn, P.J.N. Bester, M.N. 2011. Population dynamics of southern elephant seals: a synthesis of three decades of demographic research at Marion Island. African Journal of Marine Science, 33, 523–534.CrossRefGoogle Scholar
R Development Core Team. 2011. R: a language and environment for statistical computing. Vienna: Wirtschafts Universität, http://www.R-project.org.Google Scholar
Remondino, F. Fraser, C. 2006. Digital camera calibration methods: consideration and comparisons. International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, 36, 266–272.Google Scholar
Richards, R. 1992. The commercial exploitation of sea mammals at Iles Crozet and Prince Edward Islands before 1850. Polar Monographs, 1, 1–19.Google Scholar
Rode, K.D., Amstrup, S.C. Regehr, E.V. 2010. Reduced body size and cub recruitment in polar bears associated with sea ice decline. Ecological Application, 20, 768–782.CrossRefGoogle ScholarPubMed
Rosen, D.A.S. 2009. Steller sea lions Eumetopias jubatus and nutritional stress: evidence from captive studies. Mammal Review, 39, 284–306.Google Scholar
Trites, A.W. Donnelly, C.P. 2003. The decline of Steller sea lions Eumetopias jubatus in Alaska: a review of the nutritional stress hypothesis. Mammal Review, 33, 3–28.Google Scholar
Vergani, D.F., Stanganelli, Z.B. Bilenca, D. 2001. Weaning mass variation of southern elephant seals at King George Island and its possible relationship with “El Niño” and “La Niña” events. Antarctic Science, 13, 37–40.Google Scholar
Vergani, D.F., Labraga, J.C., Stanganelli, Z.B. Dunn, M. 2008. The effects of El Niño-La Niña on reproductive parameters of elephant seals feeding in the Bellingshausen. Journal of Biogeography, 35, 248–256.Google Scholar
Wilkinson, I.S. van Aarde, R.J. 2001. Investment in sons and daughters by southern elephant seals, Mirounga leonina, at Marion Island. Marine Mammal Science, 17, 873–887.CrossRefGoogle Scholar