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Sear, R; MacE, R; McGregor, IA (2003)
Publisher: Elsevier
Languages: English
Types: Article

Classified by OpenAIRE into

mesheuropmc: social sciences, humanities
Human females reproduce relatively rapidly throughout their reproductive years compared to the other great apes. It has been suggested that women are able to sustain this rapid pace by co-opting family members to help raise their children. We tested the hypothesis that the presence of kin will increase the reproductive rates of women using a longitudinal database collected from rural Gambia. We found that both the husband's mother and, to a lesser extent, the husband's father increased the probability that a woman would give birth. A woman's parents, however, had no effect on her fertility rate, nor did her elder sisters or co-wives. The presence of a woman's elder brothers even decreased her probability of giving birth. There was no evidence that elder children acted as 'helpers at the nest', as the existence of living elder children slowed down rather than increased birth rates. We suggest that the increased fertility in the presence of mothers-in-law may be due to these women helping out their daughters-in-law with domestic and subsistence duties. Given that it is paternal, rather than maternal, relatives who increase fertility, social pressures on women from older kin to bear many children may also be important.
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    • Adongo, P. B., Phillips, J. F., Kajihara, B., Fayorsey, C., Debpuur, C. & Binka, F. N. (1997). Cultural factors constraining the introduction of family planning among the Kassena-Nankana of northern Ghana. Social Science & Medicine, 45, 1789-1804.
    • Allison, P. D. (1984). Event History Analysis: regression for longitudinal event data. Newbury Park: Sage Publications.
    • Bean, L. L. & Mineau, G. P. (1986). The polygyny-fertility hypothesis: a re-evalution. Population Studies, 40, 67-81.
    • Bereczkei, T. (1998). Kinship network, direct childcare and fertility among Hungarians and Gypsies. Evolution and Human Behavior, 19, 283-298.
    • Billewicz, W. Z. & McGregor, I. A. (1981). The demography of two West African (Gambian) villages, 1951-75. Journal of Biosocial Science, 13, 219-240.
    • Borgerhoff Mulder, M. (1989). Marital status and reproductive performance in Kipsigis women: reevaluating the polygyny-fertility hypothesis. Population Studies, 43, 285-304.
    • Borgerhoff Mulder, M. (1990). Kipsigis women's preference for wealthy men: evidence for female choice in mammals? Behavioral Ecology and Sociobiology, 27, 255-264.
    • Borgerhoff Mulder, M. (1998). Brothers and sisters: how sibling interactions affect optimal parental allocations. Human Nature, 9, 119-161.
    • Chisholm, J. S. & Burbank, V. K. (1991). Monogamy and polygyny in Southeast Arnhem-Land: male coercion and female choice. Ethology and Sociobiology, 12, 291-313.
    • Crognier, E., Baali, A. & Hilali, M. K. (2001). Do "helpers at the nest" increase their parents' reproductive success? American Journal of Human Biology, 13, 365-373.
    • Draper, P. & Hames, R. (2000). Birth order, sibling investment, and fertility among Ju/'hoansi (!Kung). Human Nature, 11, 117-156.
    • Dunbar, R. I. M., Clark, A. & Hurst, N. L. (1995). Conflict and cooperation among the Vikings: contingent behavioral decisions. Ethology and Sociobiology, 16, 233-246.
    • Gibson, M. & Mace, R. (2002). The impact of labor-saving technology on first birth intervals in rural Ethiopia. Human Biology, 74, 111-128.
    • Goldstein, H. (1995). Multilevel Statistical Models. London: Edward Arnold.
    • Hawkes, K., O'Connell, J. F. & Blurton Jones, N. G. (1997). Hadza women's time allocation, offspring provisioning and the evolution of long postmenopausal life spans. Current Anthropology, 38, 551-578.
    • Hawkes, K., O'Connell, J. F., Blurton Jones, N. G., Alvarez, H. & Charnov, E. L. (1998). Grandmothering, menopause and the evolution of human life histories. Proceedings of the National Academy of Sciences, USA, 95, 1336-1339.
    • Hern, W. M. (1992). Polygyny and fertility among the Shipibo of the Peruvian Amazon. Population Studies, 46, 53-64.
    • Hill, K. (1982). Hunting and human evolution. Journal of Human Evolution, 11, 521-544.
    • Hill, K. (1993). Life history theory and evolutionary anthropology. Evolutionary Anthropology, 2, 78- 88.
    • Hill, K. & Hurtado, A. M. (1996). Ache Life History: The Ecology and Demography of a Foraging People. New York: Aldine de Gruyter.
    • Isiugo-Abanihe, U. C. (1998). Stability of marital unions and fertility in Nigeria. Journal of Biosocial Science, 30, 33-41.
    • Jasienska, G. & Ellison, P. T. (1998). Physical work causes suppression of ovarian function in women. Proceedings of the Royal Society of London Series B, Biological Sciences, 265, 1847-1851.
    • Josephson, S. C. (1993). Status, reproductive success and marrying polygynously. Ethology and Sociobiology 14, 391-396.
    • Kaplan, H., Hill, K., Lancaster, J. & Hurtado, A. M. (2000). A theory of human life history evolution: Diet, intelligence, and longevity. Evolutionary Anthropology, 9, 156-185.
    • Lamb, W. H., Lamb, C. M. B., Foord, F. A. & Whitehead, R. G. (1984). Changes in maternal and child mortality rates in three isolated Gambian villages over ten years. Lancet, 2 (8408), 912-914.
    • Larsen, U. & Vaupel, J. W. (1993). Hutterite fecundability by age and parity: strategies for frailty modeling of event histories. Demography, 30, 81-102.
    • Locoh, T. (1988). Evolution of the family in Africa. In E. van de Walle, P. Onadike & M. SalaSiakanda (Eds.), The State of African Demography (pp. 47-65.) Liege, Belgium: International Union for the Scientific Study of Population.
    • Low, B. S. (1991). Reproductive life in nineteenth century Sweden: an evolutionary perspective on demographic phenomena. Ethology and Sociobiology, 12, 411-448.
    • Mace, R. (1996). Biased parental investment and reproductive success in Gabbra pastoralists. Behavioral Ecology and Sociobiology, 38, 75-81.
    • Marlowe, F. (2000). Paternal investment and the human mating system. Behavioural Processes, 51, 45- 61.
    • McGregor, I. A. (1991). Morbidity and mortality at Keneba, the Gambia, 1950-75. In R. G. Feacham & D. T. Jamison (Eds.), Disease and Mortality in Sub-Saharan Africa (pp. 306-324.) Oxford: Oxford University Press for the World Bank.
    • Orians, G. H. (1969). On the evolution of mating systems in birds and mammals. American Naturalist, 103, 589-603.
    • Pebley, A. R. & Mbugua, W. (1989). Polygyny and fertility in sub-Saharan Africa. In R. J. Lesthaeghe (Eds.), Reproduction and Social Organisation in Sub-Saharan Africa (pp. 338-364.) Berkeley: University of California Press.
    • Pennington, R. (1992). Did food increase fertility: evaluation of Kung and Herero history. Human Biology, 64, 497-521.
    • Popkin, B. M., Guilkey, D. K., Akin, J. S., Adair, L. S., Udry, J. R. & Flieger, W. (1993). Nutrition, lactation, and birth spacing in Filipino women. Demography, 30, 333-352.
    • Rasbash, J., Browne, W., Goldstein, H., Yang, M., Plewis, I., Healy, M., Woodhouse, G., Draper, D., Langford, I. & Lewis, T. (2000). A User's Guide to MLwiN. London: Institute of Education.
    • Sear, R., Mace, R. & McGregor, I. A. (2000). Maternal grandmothers improve the nutritional status and survival of children in rural Gambia. Proceedings of the Royal Society of London, Series B, Biological Sciences, 267, 461-467.
    • Sear, R., Steele, F., McGregor, I. A. & Mace, R. (2002). The effects of kin on child mortality in rural Gambia. Demography, 39, 43-63.
    • Sellen, D., Borgerhoff Mulder, M. & Sieff, D. F. (2000). Fertility, offspring quality and wealth in Datoga pastoralists: testing evolutionary models of intersexual selection. In L. Cronk, N. Chagnon & W. Irons (Eds.), Adaptation and Human Behaviour: an Anthropological Perspective (pp. 91-113.) New York: Aldine de Gruyter.
    • Sembajwe, I. (1979). Effect of age at first marriage, number of wives, and type of marital union on fertility. Journal of Biosocial Science, 11, 341-351.
    • Singer, J. D. & Willett, J. B. (1993). Its about time: using discrete-time survival analysis to study duration and the timing of events. Journal of Educational Statistics, 18, 155-195.
    • Strassmann, B. I. & Gillespie, B. (2002). Life-history theory, fertility and reproductive success in humans. Proceedings of the Royal Society of London Series B, Biological Sciences, 269, 553- 562.
    • Strassmann, B. I. & Warner, J. H. (1998). Predictors of fecundability and conception waits among the Dogon of Mali. American Journal of Physical Anthropology, 105, 167-184.
    • Thompson, B. & Rahman, A. K. (1967). Infant feeding and child care in a West African village. Journal of Tropical Pediatrics, 13, 124-138.
    • Thompson, E. D. B. (1965). Marriage, Childbirth and Early Childhood in a Gambian Village: a SocioMedical Study. PhD thesis, University of Aberdeen.
    • Tracer, D. P. (1996). Lactation, nutrition, and postpartum amenorrhea in lowland Papua New Guinea. Human Biology, 68, 277-292.
    • Weaver, L. T. & Beckerleg, S. (1993). Is health sustainable? A village study in the Gambia. Lancet, 341, 1327-1330.
    • Whittemore, R. D. & Beverly, E. (1989). Trust in the Mandinka way: the cultural context of sibling care. In P. G. Zukow (Eds.), Sibling Interaction Across Cultures: Theoretical and Methodological Issues (pp. 26-53.) New York: Springer-Verlag.
    • Wood, J. W. (1994). Dynamics of Human Reproduction: Biology, Biometry and Demography. New York: Aldine de Gruyter.
    • Yamaguchi, K. (1991). Event History Analysis. California: Sage Publications.
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