Maternal investment and factors affecting offspring size in polar bears (Ursus maritimus)

Journal of Zoology

Volumn 245, Issue 3, 1998, Pages 253-260

  Derocher, A E ^a,c   Stirling, I ^a,b  

^a ENVIRONMENT CANADA   (Canada)

^b UNIVERSITY OF ALBERTA   (Canada)

^c NORWEGIAN POLAR INSTITUTE   (Norway)

Author keywords

Hudson Bay; Maternal investment; Polar bears; Reproduction; Sex ratio; Ursus maritimus

Indexed keywords

BEAR; BODY SIZE; MATERNAL CARE; PARENT-OFFSPRING INTERACTION; PARENTAL INVESTMENT;

CANADA;

URSUS MARITIMUS;

EID: 0031823148     PISSN: 09528369     EISSN: None     Source Type: Journal    
DOI: 10.1017/S095283699800702X     Document Type: Article

References (44)

1. Albon, S. D., Clutton-Brock, T. H. & Guinness, F. E. (1987). Early development and population dynamics in red deer: II. Density-independent effects and cohort variation. J. Anim. Ecol. 56: 69-81.
2. Arnould, J. P. Y., Boyd, I. L. & Socha, D. G. (1996). Milk consumption and growth efficiency in Antarctic fur seal (Arctocephalus gazella). Can. J. Zool. 74: 254-266.
3. Arnould, J. P. Y. & Ramsay, M. A. (1994). Milk production and milk consumption in polar boars during the ice-free period in western Hudson Bay. Can. J. Zool. 72: 1365-1370.
4. Atkinson, S. N., Stirling, I. & Ramsay, M. A. (1996). Growth in early life and relative body size among polar bears (Ursus maritimus). J. Zool. (Lond.) 239: 225-234.
5. Berger, J. (1979). Weaning conflict in desert and mountain bighorn sheep (Ovis canadensis): an ecological interpretation. Z. Tierpsychol. 50: 188-200.
6. Boyd, I. L. & McCann, T. S. (1989). Pre-natal investment in reproduction by female Antarctic fur seals, Behav, Ecol. Sociobiol. 24: 377-385.
7. Byers, J. A. & Moodie, J. D. (1990). Sex-specific maternal investment in pronghorn, and the question of a limit on differential provisioning in ungulates. Behav. Ecol. Sociobiol. 26: 157-164
8. Campagna, C., Le Boeuf, B. J., Lewis, M. & Bisioli, C. (1992). Equal investment in male and female offspring in southern elephant seals. J. Zool. (Lond.) 226: 551-561.
9. Cappozzo, H. L., Campagna, C. & Monserrat, J. (1991). Sexual dimorphism in newborn southern sea lions. Mar. Mamm. Sci. 7: 385-394.
10. Clutton-Brock, T. H. (Ed.) (1988). Reproductive success, Chicago: University of Chicago Press.
11. Clutton-Brock, T. H., Albon, S. D. & Guinness, F. E. (1981). Parental investment in male and female offspring in polygynous mammals. Nature (Lond.) 289: 487-489.
12. Clutton-Brock, T. H., Albon, S. D. & Guinness, F. E. (1985). Parental investment and sex differences in juvenile mortality in birds and mammals. Nature (Lond.) 313: 131-133.
13. Clutton-Brock, T. H., Guinness, F. E. & Albon, S. D. (1982). Red deer: behavior and ecology of two sexes. Chicago: University of Chicago Press.
14. Derocher, A. E. (1990). Supernumerary mammae and nipples in the polar bear (Ursus maritimius). J. Mammal. 71: 236-237.
15. Derocher, A. E. (1991). Population dynamics and ecology of polar bear in western Hudson Bay. PhD dissertation, University of Alberta, Edmonton.
16. Derocher, A. E., Andriashek, D. & Arnould, J. P. Y. (1993). Aspects of milk composition and lactation in polar bears. Can. J. Zool. 71: 561-567.
17. Derocher, A. E., Nelson, R. A., Stirling, I. & Ramsay, M. A. (1990). Effects of fasting and feeding on serum urea and serum creatinine levels in polar bears. Mar. Mamm. Sci. 6: 196-203.
18. Derocher, A. E. & Stirling, I. (1990). Distribution of polar bears (Ursus maritimus) during the ice-free period in western Hudson Bay. Can. J. Zool. 68: 1395-1403.
19. Derocher, A. E. & Stirling, I. (1994). Age-specific reproductive performance of female polar bears. J. Zool. (Lond.) 234: 527-536.
20. Derocher, A. E. & Stirling, I. (1995). Temporal variation in reproduction and body mass of polar bears in western Hudson Bay. Can. J. Zool. 73: 1657-1665.
21. Derocher, A. E. & Stirling, I. (1996). Aspects of survival in juvenile polar bears. Can. J. Zool. 74: 1246-1252.
22. Derocher, A. E., Stirling. I. & Andriashek, D. (1992). Pregnancy rates and serum progesterone levels of polar bears in western Hudson Bay. Can. J. Zool. 70: 561-566.
23. Frank, S. A. (1990). Sex allocation theory for birds and mammals. Annu. Rev. Ecol. Syst. 21: 13-55.
24. Kingsley, M. C. S. (1979). Fitting the von Bertalanffy growth equations to polar bear age-weight data. Can. J. Zool. 57: 1020-1025.
25. Kolenosky, G. B., Lunn, N. J., Greenwood, C. J. & Abraham, K. F. (1989). Estimating the weight of polar bears from body measurements. J. Wildl. Manage. 53: 188-190.
26. Kucera, T. E. (1991). Adaptive variation in sex ratios of offspring in nutritionally stressed mule deer. J. Mammal. 72: 745-749.
27. Latour, P. B. (1981). Interactions between free-ranging, adult male polar bears (Ursus maritimus Phipps): a case of adult social play. Can. J. Zool. 59: 1775-1783.
28. Le Boeuf, B. J., Condit, R. & Reiter, J. (1989). Parental investment and the secondary sex ratio in northern elephant seals. Behav. Ecol. Sociobiol. 25: 109-117.
29. Lee, P. C. & Moss, C. J. (1986). Early maternal investment in male and female African elephant calves. Behav. Ecol. Sociobiol. 18: 353-361.
30. Maynard-Smith, J. (1980). A new theory of sexual investment. Behav. Ecol. Sociobiol. 7: 247-251.
31. Maynard-Smith. J. & Parker, G. A. (1976). The logic of asymmetric contests. Anim. Behav. 24: 159-175.
32. McCann, T. S., Fedak, M. A. & Harwood, J. (1989). Parental investment in southern elephant seals Mirounga leonina. Behav. Ecol. Sociobiol. 25: 81-87.
33. McGinley, M. A., Temme, D. H. & Geber, M. A. (1987). Parental investment in offspring in variable environments: theoretical and empirical considerations. Am. Nat. 130: 370-398.
34. Mead, R. A. (1989). The physiology and evolution of delayed implantation in carnivores. In Carnivore behavior, ecology, and evolution: 437-464. Gittleman, J. L. (Ed.). Ithaca, New York: Cornell University Press.
35. Ramsay, M. A. & Stirling, I. (1986). On the mating system of polar bears. Can. J. Zool 64: 2142-2151.
36. Ramsay, M. A. & Stirling, I. (1988). Reproductive biology and ecology of female polar bears (Ursus maritimus). J. Zool. (Lond.) 214: 601-634.
37. Reiter, J., Stinson, N. L. & Le Boeuf, B. J. (1978). Northern elephant seal development: the transition from weaning to nutritional independence. Behav. Ecol. Sociobiol. 3: 337-367.
38. SAS Institute Inc. (1989). SAS/STAT user's guide, version 6. Cary, NC, U.S.A.: SAS Institute Inc.
39. Stirling, I. & Derocher, A. E. (1990). Factors affecting the evolution and behavioral ecology of the modern bears, Int. Conf. Bear Biol Manage. 8: 189-204.
40. Stirling, I., Jonkel, C., Smith, P., Robertson, R. & Cross, D. (1977). The ecology of the polar bear (Ursus maritimus) along the western coast of Hudson Bay. Can. Wildl. Serv. Occas. Pap. No. 33.
41. Stirling, I., Spencer, C. & Andriashek, D. (1989). Immobilization of polar bears (Ursus maritimus) with Telazol in the Canadian Arctic. J. Wildl. Dis. 25: 159-168.
42. Trivers, R. L. & Willard, D. E. (1973). Natural selection of parental ability to vary the sex ratio of offspring. Science 179: 90-92.
43. Whitehead, H. (1994). Delayed competitive breeding in roving males. J Theor. Biol. 166: 127-133.
44. Wimsatt, W. A. (1963). Delayed implantation in the Ursidae, with particular reference to the black bear (Ursus americanus, Pallas). In Delayed implantation: 49-86. Enders, A. C. (Ed.). Chicago: University of Chicago Press.