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Behavioral Ecology and Sociobiology

, Volume 55, Issue 4, pp 349–362 | Cite as

Harem choice and breeding experience of female southern elephant seals influence offspring survival

  • Clive R. McMahon
  • Corey J. A. BradshawEmail author
Original Article

Abstract

Female mammals can increase their lifetime fitness through modification of investment potential and by providing better rearing environments with improved breeding experience. We examined the relationships between reproductive fitness and the behavioural decisions that female southern elephant seals (Mirounga leonina) made during the breeding season. We examined whether mother age and breeding experience influenced reproductive success (measured as 1st-year survival probability), and whether there was a change in the choice of harem size with increasing age. Pups produced by young mothers had lower 1st-year survival probability than pups produced by older mothers. A significant increase in mean female mass with age required an analysis of both these effects on offspring survival. There was a significant positive effect of both female age and mass, and the interaction between the two, on 1st-year pup survival. The proportion of young mothers (<5 years old) decreased and the proportion of older mothers (>6 years old) increased with increasing harem size (harems surveyed from 1997 to 2001). Females chose larger harems in which to breed as they aged. Females demonstrated fidelity to breeding areas among successive breeding seasons, with older females displaying greater breeding-site fidelity than younger females. The mean number of previous breeding attempts per female within a harem (breeding experience) increased significantly with increasing harem size. Breeding females returned to breed later in the breeding season as they aged—we hypothesize that young, subordinate females gain a priority advantage by returning earlier. These results lend support to the hypothesis that there are fitness advantages, in terms of offspring survival, that are conferred to females that breed in successively larger harems with age. Potential mechanisms that select for females to improve their breeding conditions include improved mate selection and the avoidance of conspecific harassment in harems.

Keywords

Reproductive success Mirounga leonina Pup survival Harem size Harem density 

Notes

Acknowledgements

This study was supported by the Antarctic Scientific Advisory Committee (ASAC), an Australian Research Council (ARC) Australian Postdoctoral Fellowship, a Natural Science and Engineering Research Council of Canada (NSERC) Postdoctoral Fellowship and a Sea World Research and Rescue Foundation grant to C.J.A.B. We are indebted to our colleagues of the 50th, 51st, 52nd, 53rd and 54th Australian Antarctic Research Expeditions (ANARE) to Macquarie Island who so ably assisted us in the field by marking seals and collecting resights in often miserable conditions. In particular, we thank H. Burton for his foresight in initiating the demographic program. R. Harcourt, M. Hindell, I. Field, K. Wertz and K. Wheatley provided helpful and insightful comments during writing of the manuscript. We also thank the Associate Editor, F. Trillmich, J. Reiter and an anonymous referee for helpful comments to improve the manuscript.

References

  1. Arnbom T, Fedak MA, Rothery P (1994) Offspring sex ratio in relation to female size in southern elephant seals, Mirounga leonina. Behav Ecol Sociobiol 35:373–378CrossRefGoogle Scholar
  2. Arnbom T, Fedak MA, Boyd IL (1997) Factors affecting maternal expenditure in southern elephant seals during lactation. Ecology 78:471–483Google Scholar
  3. Arnold SJ (1994) Multivariate inheritance and evolution: a review of concepts. In: Boake CRB (ed) Quantitative genetic studies of behavioral evolution. University of Chicago Press, Chicago, pp 17–48Google Scholar
  4. Baldi R, Campagna C, Pedraza S, Le Boeuf BJ (1996) Social effects of space availability on the breeding behaviour of elephant seals in Patagonia. Anim Behav 51:717–724CrossRefGoogle Scholar
  5. Beletsky LD, Orians GH (1987) Territoriality among male red-winged blackbirds. II. Removal experiments and site dominance. Behav Ecol Sociobiol 20:339–349Google Scholar
  6. Beletsky LD, Orians GH (1989) Territoriality among male red-winged blackbirds. III. Testing hypotheses of territorial dominance. Behav Ecol Sociobiol 24:333–339Google Scholar
  7. Boness DJ, Bowen WD, Iverson SJ (1995) Does male harassment of females contribute to reproductive synchrony in the grey seal by affecting maternal performance? Behav Ecol Sociobiol 36:1–10CrossRefGoogle Scholar
  8. Bowen WD, Ellis SL, Iverson SJ, Boness DJ (2001a) Maternal effects on offspring growth rate and weaning mass in harbour seals. Can J Zool 79:1088–1101CrossRefGoogle Scholar
  9. Bowen WD, Iverson SJ, Boness DJ, Oftedal OT (2001b) Foraging effort, food intake and lactation performance depend on maternal mass in a small phocid seal. Funct Ecol 15:325–334CrossRefGoogle Scholar
  10. Boyd IL (2000) State-dependent fertility in pinnipeds: contrasting capital and income breeders. Funct Ecol 14:623–630CrossRefGoogle Scholar
  11. Boyd IL, McCann TS (1989) Pre-natal investment in reproduction by female Antarctic fur seals. Behav Ecol Sociobiol 24:377–385Google Scholar
  12. Burnham KP, Anderson DR (1998) Model selection and inference: a practical information-theoretic approach. Springer, Berlin Heidelberg New YorkGoogle Scholar
  13. Cameron EZ, Linklater WL, Stafford KJ, Minot EO (2000) Aging and improving reproductive success in horses: declining residual reproductive value or just older and wiser? Behav Ecol Sociobiol 47:243–249CrossRefGoogle Scholar
  14. Campagna C, Le Boeuf BJ, Lewis M, Baldi R (1992) Equal investment in male and female offspring in the southern elephant seal. J Zool Lond 226:551–561Google Scholar
  15. Carrick R, Ingham SE (1960) Ecological studies of the southern elephant seal Mirounga leonina (L.), at Macquarie Island and at Heard Island. Mammalia 24:325–342Google Scholar
  16. Carrick R, Csordas SE, Ingham SE (1962) Studies on the southern elephant seal, Mirounga leonina (L.). IV. Breeding and development. CSIRO Wildlife Res 7:161–197Google Scholar
  17. Chittleborough RG, Ealey EHM (1951) Seal marking at Heard Island, 1949. 1. Department of External Affairs, Antarctic Division, MelbourneGoogle Scholar
  18. Christensen TE, Le Boeuf BJ (1978) Aggression in the female northern elephant seal, Mirounga angustirostris. Behaviour 64:158–172PubMedGoogle Scholar
  19. Clutton-Brock TH (1988) Reproductive success. Studies of individual variation in contrasting breeding systems. University of Chicago Press, Chicago, IllGoogle Scholar
  20. Clutton-Brock TH, Albon SD, Guinness FE (1984) Maternal dominance, breeding success and birth sex ratios in red deer. Nature 308:358–360Google Scholar
  21. Cormack RM (1964) Models for capture-recapture. Biometrika 51:429–438Google Scholar
  22. Côté SD, Festa-Bianchet M (2001) Reproductive success in female mountain goats: the influence of age and social rank. Anim Behav 62:173–181CrossRefGoogle Scholar
  23. Cox C, Le Boeuf BJ (1977) Female incitation of male competition: a mechanism in sexual selection. Am Nat 111:317–335CrossRefGoogle Scholar
  24. Crocker DE, Williams JD, Costa DP, Le Boeuf BJ (2001) Maternal traits and reproductive effort in northern elephant seals. Ecology 82:3541–3555Google Scholar
  25. Ellis SL, Bowen WD, Boness DJ, Iverson SJ (2000) Maternal effects on offspring mass and stage of development at birth in the harbor seal, Phoca vitulina. J Mammal 81:1143–1156Google Scholar
  26. Engelhard GH, Hoff J van den, Broekman M, Baarspul ANJ, Field I, Burton HR, Reijnders PJH (2001) Mass of weaned elephant seal pups in areas of low and high human presence. Polar Biol 24:244–251CrossRefGoogle Scholar
  27. Fedak MA, Arnbom T, Boyd IL (1996) The relation between size of southern elephant seal mothers, the growth of their pups and the use of maternal energy, fat and protein during lactation. Physiol Zool 69:887–911Google Scholar
  28. Field IC, Bradshaw CJA, McMahon CR, Harrington J, Burton HR (2002) Effects of age, size and condition of elephant seals (Mirounga leonina) on their intravenous anaesthesia with tiletamine and zolazepam. Vet Rec 151:235–240PubMedGoogle Scholar
  29. Forslund P, Part T (1995) Age and reproduction in birds—hypotheses and tests. Trends Ecol Evol 10:374–378CrossRefGoogle Scholar
  30. Freckleton RP (2002) On the misuse of residuals in ecology: regression of residuals vs. multiple regression. J Anim Ecol 71:542–545Google Scholar
  31. Galimberti F, Boitani L, Marzetti I (2000a) Female strategies of harassment reduction in southern elephant seals. Ethol Ecol Evol 12:367–388Google Scholar
  32. Galimberti F, Boitani L, Marzetti I (2000b) The frequency and costs of harassment in southern elephant seals. Ethol Ecol Evol 12:345–365Google Scholar
  33. Galimberti F, Boitani L, Marzetti I (2000c) Harassment during arrival on land and departure to sea in southern elephant seals. Ethol Ecol Evol 12:389–404Google Scholar
  34. Goldsworthy SD, He X, Tuck GN, Lewis M, Williams R (2001) Trophic interactions between the Patagonian toothfish, its fishery, and seals and seabirds around Macquarie Island. Mar Ecol Prog Ser 218:283–302Google Scholar
  35. Hall AJ, McConnell BJ, Barker RJ (2001) Factors affecting first-year survival in grey seals and their implications for life history strategy. J Anim Ecol 70:138–149Google Scholar
  36. Hastings KK, Testa JW (1998) Maternal and birth colony effects on survival of Weddell seal offspring from McMurdo Sound, Antarctica. J Anim Ecol 67:722–740CrossRefGoogle Scholar
  37. Hepp GR, Kennamer RA (1993) Effects of age and experience on reproductive performance of wood ducks. Ecology 74:2027–2036Google Scholar
  38. Hindell MA (1991) Some life-history parameters of a declining population of southern elephant seals, Mirounga leonina. J Anim Ecol 60:119–134Google Scholar
  39. Hindell MA, Burton HR (1987) Past and present status of the southern elephant seal (Mirounga leonina) at Macquarie Island. J Zool Lond 213:365–380Google Scholar
  40. Hindell MA, Slip DJ (1997) The importance of being fat: maternal expenditure in the southern elephant seal Mirounga leonina. In: Hindell M, Kemper C (eds) Marine mammal research in the Southern Hemisphere, vol 1. Status, ecology and medicine. Surrey Beatty, Chipping Norton, pp 72–77Google Scholar
  41. Huber HR, Beckham C, Nisbet J (1991) Effects of the 1982–83 El Niño on northern elephant seals on the South Farallon Islands, California. In: Trillmich F, Ono KA (eds) Pinnipeds and El Niño: responses to environmental stress, vol 88. Springer, Berlin Heidelberg New York, pp 219–233Google Scholar
  42. Jolly GM (1965) Explicit estimates from mark-recapture data with both death and immigration-stochastic models. Biometrika 52:225–247Google Scholar
  43. Laws RM (1953) The elephant seal (Mirounga leonina Linn.). I. Growth and age. Falkland Isl Depend Surv Sci Rep 8:1–62Google Scholar
  44. Le Boeuf BJ, Morris P, Reiter J (1994) Juvenile survivorship of northern elephant seals. In: Le Boeuf BJ, Laws RM (eds) Elephant seals: population ecology, behavior, and physiology. University of California Press, Berkley, pp 121–136Google Scholar
  45. Lebreton J-D, Burnham KP, Clobert J, Anderson DR (1992) Modeling survival and testing biological hypotheses using marked animals: a unified approach with case studies. Ecol Monogr 62:67–118Google Scholar
  46. Lunn NJ, Boyd IL, Croxall JP (1994) Reproductive performance of female Antarctic fur seals: the influence of age, breeding experience, environmental variation and individual quality. J Anim Ecol 63:827–840Google Scholar
  47. Manly BFJ (1997) Randomization, bootstrap and Monte Carlo methods in biology. Chapman & Hall, LondonGoogle Scholar
  48. McCann TS (1981) Aggression and sexual activity of male southern elephant seals, Mirounga leonina. J Zool Lond 195:295–310Google Scholar
  49. McCann TS (1982) Aggressive and maternal activities of female southern elephant seals (Mirounga leonina). Anim Behav 30:268–276Google Scholar
  50. McLaren IA (1993) Growth in pinnipeds. Biol Rev 68:1–79Google Scholar
  51. McMahon CR, Hoff J van den, Burton HR, Davis PD (1997) Evidence for precocious development in female pups of the southern elephant seal, Mirounga leonina, at Macquarie Island. In: Hindell MA, Kemper C (eds) Marine mammal research in the Southern Hemisphere, vol 1. Status, ecology and medicine. Surrey Beatty, Chipping Norton, pp 92–96Google Scholar
  52. McMahon CR, Burton HR, Bester MN (1999) First-year survival of southern elephant seals, Mirounga leonina, at sub-Antarctic Macquarie Island. Polar Biol 21:279–284CrossRefGoogle Scholar
  53. McMahon CR, Burton H, McLean S, Slip D, Bester M (2000a) Field immobilisation of southern elephant seals with intravenous tiletamine and zolazepam. Vet Rec 146:251–254PubMedGoogle Scholar
  54. McMahon CR, Burton HR, Bester MN (2000b) Weaning mass and the future survival of juvenile southern elephant seals, Mirounga leonina, at Macquarie Island. Antarct Sci 12:149–153Google Scholar
  55. McMahon CR, Burton HR, Bester MN (2003) A demographic comparison of two southern elephant seal populations. J Anim Ecol 72:61–74CrossRefGoogle Scholar
  56. Mellish JAE, Iverson SJ, Bowen WD (1999a) Variation in milk production and lactation performance in grey seals and consequences for pup growth and weaning characteristics. Physiol Biochem Zool 72:677–690CrossRefPubMedGoogle Scholar
  57. Mellish JAE, Iverson SJ, Bowen WD, Hammill MO (1999b) Fat transfer and energetics during lactation in the hooded seal: the roles of tissue lipoprotein lipase in milk fat secretion and pup blubber deposition. J Comp Physiol B 169:377–390CrossRefPubMedGoogle Scholar
  58. Milner JM, Elston DA, Albon SD (1999) Estimating the contributions of population density and climatic fluctuations to interannual variation in survival of Soay sheep. J Anim Ecol 68:1235–1247CrossRefGoogle Scholar
  59. Pistorius PA, Bester MN, Kirkman SP, Taylor FE (2001) Pup mortality in southern elephant seals at Marion Island. Polar Biol 24:828–831CrossRefGoogle Scholar
  60. Pomeroy PP, Fedak MA, Rothery P, Anderson S (1999) Consequences of maternal size for reproductive expenditure and pupping success of grey seals at North Rona, Scotland. J Anim Ecol 68:235–253CrossRefGoogle Scholar
  61. Pomeroy PP, Wilmar JW, Amos W, Twiss SD (2001) Reproductive performance links to fine-scale spatial patterns of female grey seal relatedness. Proc R Soc Lond B 268:711–717CrossRefPubMedGoogle Scholar
  62. Reiter J, Le Boeuf BJ (1991) Life history consequences of variation in age at primiparity in northern elephant seals. Behav Ecol Sociobiol 28:153–160Google Scholar
  63. Reiter J, Panken KS, Le Boeuf BJ (1981) Female competition and reproductive success in northern elephant seals. Anim Behav 29:670–687Google Scholar
  64. Riedman ML, Le Boeuf BJ (1982) Mother-pup separation and adoption in northern elephant seals. Behav Ecol Sociobiol 11:203–215Google Scholar
  65. Rohwer S (1982) The evolution of reliable and unreliable badges of fighting ability. Am Zool 22:531–546Google Scholar
  66. Saether B-E (1997) Environmental stochasticity and population dynamics of large herbivores: a search for mechanisms. Trends Ecol Evol 12:143–149Google Scholar
  67. Schaffer WM (1974) Selection for optimal life histories: the effect of age structure. Ecology 55:291–303Google Scholar
  68. Seber GAF (1965) A note on the multiple recapture census. Biometrika 52:319–335Google Scholar
  69. Sokal RR, Rohlf FJ (1981) Biometry. The principles and practice of statistics in biological research, 2nd edn. Freeman, New YorkGoogle Scholar
  70. Stearns SC (1992) The evolution of life histories. Oxford University Press, OxfordGoogle Scholar
  71. Tobias J (1997) Asymmetric territorial contests in the European robin: the role of settlement costs. Anim Behav 54:9–21CrossRefPubMedGoogle Scholar
  72. Trivers RL (1972) Parental investment and sexual selection. In: Campbell B (ed) Sexual selection and the descent of man 1871–1971. Aldine, Chicago, pp 136–179Google Scholar
  73. White GC, Burnham KP (1999) Program MARK: survival estimation from populations of marked animals. Program MARK: survival estimation from populations of marked animals 46 [Suppl]:120–138Google Scholar

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Antarctic Wildlife Research Unit, School of ZoologyUniversity of TasmaniaHobartAustralia
  2. 2.Australian Antarctic DivisionKingstonAustralia
  3. 3.Antarctic Wildlife Research Unit, School of ZoologyUniversity of TasmaniaHobartAustralia

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