Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis)

Costa DP, Trillmich F, Croxall JP (1988)
Behavioral Ecology and Sociobiology 22(5): 361-364.

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Journal Article | Published | English
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Intraspecific allometry of pup mass as a function of maternal mass was analysed in Antarctic fur seals (Arctocephalus gazella), a highly dimorphic species. The allometric exponent was 0.6, much lower than in interspecific comparisons. Slopes were the same for mother-son pairs as for mother-daughter pairs, but adjusted means were significantly higher for the former, indicating higher reproductive effort of mothers of sons. The correlation of maternal mass with pup mass explained 59% of the variance in female pup mas but only 18% of that in male pup mass. Females appeared to produce sons which were as big as possible. Relative pup mass decreased with increasing maternal mass indicating a lower reproductive effort of bigger and presumably older mothers, contrary to expectations from life history theory. Sex ratio of pups showed no relation to maternal mass.
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Costa DP, Trillmich F, Croxall JP. Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis). Behavioral Ecology and Sociobiology. 1988;22(5):361-364.
Costa, D. P., Trillmich, F., & Croxall, J. P. (1988). Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis). Behavioral Ecology and Sociobiology, 22(5), 361-364.
Costa, D. P., Trillmich, F., and Croxall, J. P. (1988). Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis). Behavioral Ecology and Sociobiology 22, 361-364.
Costa, D.P., Trillmich, F., & Croxall, J.P., 1988. Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis). Behavioral Ecology and Sociobiology, 22(5), p 361-364.
D.P. Costa, F. Trillmich, and J.P. Croxall, “Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis)”, Behavioral Ecology and Sociobiology, vol. 22, 1988, pp. 361-364.
Costa, D.P., Trillmich, F., Croxall, J.P.: Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis). Behavioral Ecology and Sociobiology. 22, 361-364 (1988).
Costa, D. P., Trillmich, Fritz, and Croxall, J. P. “Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis)”. Behavioral Ecology and Sociobiology 22.5 (1988): 361-364.
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