Intervals between marriage and first birth in mothers and daughters

Desjardins, Bertrand; Bideau, Alain; Heyer, Évelyne; Brunet, Guy

doi:10.1017/s0021932000019064

Cited by 17 publications

(14 citation statements)

References 4 publications

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“…The protogenesic interval is considered as a reliable index of reproductive potential in human populations. 39 HP and GLM both uncovered an independent positive effect of the long-term inbreeding coefficient of offspring (f o ) on the protogenesic interval (HP, 2.1% of variance, P ¼ 0.029; GLM, Po0.05). GLM models including interactions indicated that this effect was significantly stronger for spouses with a high long-term inbreeding coefficient of the female (Po0.0005).…”

Section: Inbreeding and Human Fertilitymentioning

confidence: 99%

Impact of inbreeding on fertility in a pre-industrial population

et al. 2008

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Little is known about the effects of inbreeding on reproduction in modern human societies. It appears indeed that biological effects are hidden by socioeconomic factors, which are the major determinants of fertility. It has been established, in particular, that socially induced reproductive compensation tends to homogenize the number of offspring per family in a given population. Besides, in the field of evolutionary biology, a number of empirical and theoretical studies have shown that the effects of inbreeding are condition dependent. In particular, theoretical developments on the evolution of senescence predict that the deleterious effects of inbreeding should increase with age. We rely on these developments to examine the effects of inbreeding on fertility in a cohort of Canadian women born in the late 19th century. The analysis does not allow for the detection of any effect of inbreeding on the overall number of offspring of women. However, results indicate that high levels of close father inbreeding are associated with a reduction of the productivity of parents during the second half of their reproductive period, as compared with the first half. We suggest that inbreeding depression affects reproduction in modern societies through an interaction with age.

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Section: Inbreeding and Human Fertilitymentioning

confidence: 99%

Impact of inbreeding on fertility in a pre-industrial population

et al. 2008

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“…All the ancestors of every individual who married before 1800 were traced back to the founders of the population. Previous studies have shown that the population of that period lived under 'natural fertility' conditions, as defined by Henry (Henry, 1972) as it was free of deliberate fertility control (Charbonneau, 1993;Desjardins et al, 1994;Desjardins et al, 1991).…”

Section: Data and Selection Of Casesmentioning

confidence: 99%

Postreproductive Longevity in a Natural Fertility Population

Gagnon

Mazan

Desjardins

et al. 2008

Kinship and Demographic Behavior in the Past

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Fertility patterns may be useful markers for rates of biological aging. Based on evolutionary and socio-demographic approaches to historical data from the population of Québec (taken from the Registre de population du Québec ancien at the University of Montreal), we examine the effects of reproduction on longevity. Using Cox hazard models on about 2,000 couples married in the colony before 1740, we show that women bearing their last child late in life had longer post-reproductive lives, suggesting that late menopause is associated with an overall slower rate of aging. Increased parity had an opposite, detrimental effect on women's post-reproductive survival. On the other hand, husband's longevity was less sensitive to parity and reproductive history. For husbands increased effective family size (EFS; the number of children who survived up to age 18) in a "compressed" reproductive time-span meant higher chances for survival past age 60.Children may serve as strong economical assets on farmstead during colonization, which would mostly benefit fathers. In a collaborative effort to unveil post-reproductive aging patterns in historical populations, the results are compared to previous analyses conducted on the Utah population database and evolutionary and socio-demographic theories addressed in light of the results.3

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“…The primary interest of this correlation is that it allows a synthetic view on the vertical transmission of demographic behaviors (i.e., fertility, mortality, nuptiality, and migration) that are important for the effective reproduction of an individual. Studies on the transmission of any one of these factors taken alone in the Québec population do not show a strong link between generation (Desjardins and Charbonneau, 1990;Desjardins et al, 1991): correlations were very low and even null.…”

Section: What Runs In Families?mentioning

confidence: 99%

“…Entirely reconstituted from its first permanent settlement in 1608 to the end of the 18 th century by the Programme de recherche en démographie historique (PRDH), this semiclosed and homogeneous population provides a means to measure fertility transmission at a time when birth control was unknown. Studies based on the PRDH file displayed a relatively low (if not null) impact of biological factors on many demographic measurements of interest, such as the heritability of longevity (Desjardins and Charbonneau, 1990), the transmission of the capacity to reproduce, i.e., the transmission of fecundity (Desjardins et al, 1991), and the hypothesis of a trade-off between early fecundity and longevity (Le Bourg et al, 1993). More recent studies exhibit a somewhat inverse relationship, i.e., an impact of environmental factors (such as climate), on biologically related reproductive variables (e.g., sex ratio; Nonaka et al, 1999).…”

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confidence: 99%

Intergenerational correlation of effective family size in early Québec (Canada)

Gagnon

Heyer

2001

American J Hum Biol

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The use of a comprehensive demographic database of the early French Canadian population (1608-1800) reveals an almost null impact of parents' fertility on children's fertility (r approximately 0.01-0.05), which contradicts the commonly held view that family size has a tendency to run in families. However, in this population, there is a clear transmission from one generation to the next of the effective family size within a given geographical area (EFS, defined as the number of children that settle per settled individual). Three types of correlations between EFS of parents and children are presented in order to account for the impact of socio-demographic differentials. Individuals who belong to a large sibship and who settled in a given subdivision tend to encourage the settlement of a high number of their own children in the same subdivision (r approximately 0.1-0.3). An additional correlation was introduced to see if geographically-based differentials of EFS can account for the differential of founders' regional genetic contribution. The analysis shows that EFS correlation has a definite impact on the concentration of a population's gene pool (it increases it by approximately 20%-45%), and partly accounts for the differences between subdivisions in this regard.

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Intervals between marriage and first birth in mothers and daughters

Cited by 17 publications

References 4 publications

Impact of inbreeding on fertility in a pre-industrial population

Impact of inbreeding on fertility in a pre-industrial population

Postreproductive Longevity in a Natural Fertility Population

Intergenerational correlation of effective family size in early Québec (Canada)

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