Kai P Willführ
Dados Biográficos
| ID | 122622 |
|---|---|
| NOME | Kai P Willführ |
| PRENOMES | Kai P |
| SOBRENOME | Willführ |
| ASSINATURA | WILLFÜHR K P |
| AFILIAÇÕES | Max Planck Institute for Demographic Research |
| ORCID | 0000-0002-9789-341X |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 14 |
| TOTAL DE CITAÇÕES | 13 |
| TOTAL COMO AUTOR | 13 |
| TOTAL COMO EDITOR | 1 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2009 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 2 |
Affected by many births, supported by many children? Later-life survival from a life course perspective in three historical populations
Is high fertility related to shorter lifespan? Evolutionary theories predict negative physiological effects of fertility on women’s later-life survival. However, kin and especially one’s own children may contribute positively to women’s survival in old age. Family members may transfer resources and provide caretaking assistance as women age and be a source of social support that contributes to health and survival. This paper focuses on the extent…
Evolutionary Social Sciences
and social sciences.The contributions of the present book were largely presented at these two conferences.In addition, selected further contributions were invited to cover evolutionary social science research in the German-speaking area as broadly as possible.The present work is the first comprehensive overview of evolutionary social science research in the German-speaking area, which is intended to further promote the aforementioned increase in …
The Aftermath of the February Flood of 1825
In February 1825, the dikes broke after a spring tide in the Krummhörn region in East Frisia, Germany, causing a severe disaster. Although the flood did not claim many victims, substantial damage was done to the farmland, and the economic crisis that followed permanently changed the social structure in the Krummhörn. We study family reconstitutions of the region linked to information about socioeconomic status, detailed reports of the flood damag…
The impact of kin proximity on net marital fertility and maternal survival in Sweden 1900–1910—Evidence for cooperative breeding in a societal context of nuclear families, or just contextual correlati…
OBJECTIVE: We investigate the association between the geographic proximity of the grandparents on net marital fertility and maternal survival in Sweden, 1900-1910, within the framework of the cooperative-breeding-hypothesis. METHODS: Data were derived from Swedish full-count censuses (1880-1910) and the Swedish Death Index. Married couples were linked to their parental households. Poisson and logistic regression analyses were used to investigate …
Effects of Individual Mortality Experience on Out-of-Wedlock Fertility in Eighteenth- and Nineteenth-Century Krummhörn, Germany
Life history theory predicts that exposure to high mortality in early childhood leads to faster and riskier reproductive strategies. Individuals who grew up in a high mortality regime will not overly wait until they find a suitable partner and form a stable union because premature death would prevent them from reproducing. Cox proportional hazard models were used to determine whether women who experienced sibling death during early childhood (0-5…
High consanguinity promotes intergenerational wealth concentration in socioeconomically privileged Krummhörn families of the 18th and 19th centuries
Step-Parenting
Why does paternal death accelerate the transition to first marriage in the C18-C19 Krummhörn population?
Among the population of the Krummhörn region (Ostfriesland, Germany) in the 18th and 19th centuries, the death of the father in the family led on average to the accelerated marriage of his children. Three evolutionary explanations are offered for this “paternal absence” effect in the literature: namely, (i) the assumption of an adaptive “psychosocial acceleration” of the children with prepubertal experience of uncertainty; (ii) an opportunistic a…
The consequences of sibling formation on survival and reproductive success across different ecological contexts
This article investigates the relationship between additional siblings and the probability of offspring survival, marriage, and fertility across the historical populations of the St Lawrence Valley in Quebec (1670–1799) and the Krummhörn region in Germany (1720–1874). Both populations existed in agriculturally based economies, but differ in important ways. The Krummhörn population faced a fixed supply of land, which was concentrated amongst a sma…
Social Strata Differentials in Reproductive Behavior among Agricultural Families in the Krummhörn Region (East Frisia, 1720-1874)
In this paper, we investigate how the reproductive behavior of families in the historical Krummhörn region was affected by their social status and by short-term fluctuations in their socioeconomic conditions. Poisson and Cox regression models are used to analyze the age at first reproduction, fertility, the sex ratio of the offspring, sex-specific infant/child survival, and the number of children. In addition, we investigate how fluctuations in c…
Phenotype‐environment mismatch due to epigenetic inheritance? Programming the offspring's epigenome and the consequences of migration
OBJECTIVE: It has been suggested that epigenetic inheritance is an important factor influencing mortality. We use data about the historical population of Québec (years 1670-1740) to study whether parents modify their offspring's phenotype epigenetically prior to conception in response to predicted/perceived mortality. If so, children growing up in the predicted environment enjoy a phenotype-environment-match that should lower mortality, whereas c…
Are Stepparents Always Evil? Parental Death, Remarriage, and Child Survival in Demographically Saturated Krummhörn (1720-1859) and Expanding Québec (1670-1750)
Parental death precipitates a cascade of events leading to more or less detrimental exposures, from the sudden and dramatic interruption of parental care to cohabitation with stepparents and siblings in a recomposed family. This article compares the effect of early parental loss on child survival in the past in the Krummhörn region of East Frisia (Germany) and among the French Canadian settlers of the Saint Lawrence Valley (Québec, Canada). The K…
Are Stepmothers Evil or Simply Unskilled? Infant Death Clustering in Recomposed Families
We measure the concentration of infant deaths in families in the historical populations of Krummhörn, Germany and Québec, Canada in order to investigate whether mothers in recomposed families differ regarding their maternal quality. In particular, we are interested in whether stepmothers in Krummhörn are responsible for a diminution in the survival of their stepchildren because they poorly substitute maternal child care or because they disadvanta…
Short‐ and long‐term consequences of early parental loss in the historical population of the Krummhörn (18th and 19th century)
The impact of the early loss of one's father or one's mother on the survival and age at death of children was investigated on the basis of a historical reconstitution of families from the Krummhörn (East Frisia/Ostfriesland; Germany) with the aid of Kaplan‐Meier plots and the Cox regression. In our analyses, we took into account the changed situation of the family after the death of a parent by incorporating the surviving spouse's remarriage or r…
The consequences of sibling formation on survival and reproductive success across different ecological contexts
This article investigates the relationship between additional siblings and the probability of offspring survival, marriage, and fertility across the historical populations of the St Lawrence Valley in Quebec (1670–1799) and the Krummhörn region in Germany (1720–1874). Both populations existed in agriculturally based economies, but differ in important ways. The Krummhörn population faced a fixed supply of land, which was concentrated amongst a sma…
Are Stepparents Always Evil? Parental Death, Remarriage, and Child Survival in Demographically Saturated Krummhörn (1720-1859) and Expanding Québec (1670-1750)
Parental death precipitates a cascade of events leading to more or less detrimental exposures, from the sudden and dramatic interruption of parental care to cohabitation with stepparents and siblings in a recomposed family. This article compares the effect of early parental loss on child survival in the past in the Krummhörn region of East Frisia (Germany) and among the French Canadian settlers of the Saint Lawrence Valley (Québec, Canada). The K…
The Aftermath of the February Flood of 1825
In February 1825, the dikes broke after a spring tide in the Krummhörn region in East Frisia, Germany, causing a severe disaster. Although the flood did not claim many victims, substantial damage was done to the farmland, and the economic crisis that followed permanently changed the social structure in the Krummhörn. We study family reconstitutions of the region linked to information about socioeconomic status, detailed reports of the flood damag…
Short‐ and long‐term consequences of early parental loss in the historical population of the Krummhörn (18th and 19th century)
The impact of the early loss of one's father or one's mother on the survival and age at death of children was investigated on the basis of a historical reconstitution of families from the Krummhörn (East Frisia/Ostfriesland; Germany) with the aid of Kaplan‐Meier plots and the Cox regression. In our analyses, we took into account the changed situation of the family after the death of a parent by incorporating the surviving spouse's remarriage or r…
Are Stepmothers Evil or Simply Unskilled? Infant Death Clustering in Recomposed Families
We measure the concentration of infant deaths in families in the historical populations of Krummhörn, Germany and Québec, Canada in order to investigate whether mothers in recomposed families differ regarding their maternal quality. In particular, we are interested in whether stepmothers in Krummhörn are responsible for a diminution in the survival of their stepchildren because they poorly substitute maternal child care or because they disadvanta…
Phenotype‐environment mismatch due to epigenetic inheritance? Programming the offspring's epigenome and the consequences of migration
OBJECTIVE: It has been suggested that epigenetic inheritance is an important factor influencing mortality. We use data about the historical population of Québec (years 1670-1740) to study whether parents modify their offspring's phenotype epigenetically prior to conception in response to predicted/perceived mortality. If so, children growing up in the predicted environment enjoy a phenotype-environment-match that should lower mortality, whereas c…
Are Stepparents Always Evil? Parental Death, Remarriage, and Child Survival in Demographically Saturated Krummhörn (1720-1859) and Expanding Québec (1670-1750)
Parental death precipitates a cascade of events leading to more or less detrimental exposures, from the sudden and dramatic interruption of parental care to cohabitation with stepparents and siblings in a recomposed family. This article compares the effect of early parental loss on child survival in the past in the Krummhörn region of East Frisia (Germany) and among the French Canadian settlers of the Saint Lawrence Valley (Québec, Canada). The K…
Social Strata Differentials in Reproductive Behavior among Agricultural Families in the Krummhörn Region (East Frisia, 1720-1874)
In this paper, we investigate how the reproductive behavior of families in the historical Krummhörn region was affected by their social status and by short-term fluctuations in their socioeconomic conditions. Poisson and Cox regression models are used to analyze the age at first reproduction, fertility, the sex ratio of the offspring, sex-specific infant/child survival, and the number of children. In addition, we investigate how fluctuations in c…
The consequences of sibling formation on survival and reproductive success across different ecological contexts
This article investigates the relationship between additional siblings and the probability of offspring survival, marriage, and fertility across the historical populations of the St Lawrence Valley in Quebec (1670–1799) and the Krummhörn region in Germany (1720–1874). Both populations existed in agriculturally based economies, but differ in important ways. The Krummhörn population faced a fixed supply of land, which was concentrated amongst a sma…
Why does paternal death accelerate the transition to first marriage in the C18-C19 Krummhörn population?
Among the population of the Krummhörn region (Ostfriesland, Germany) in the 18th and 19th centuries, the death of the father in the family led on average to the accelerated marriage of his children. Three evolutionary explanations are offered for this “paternal absence” effect in the literature: namely, (i) the assumption of an adaptive “psychosocial acceleration” of the children with prepubertal experience of uncertainty; (ii) an opportunistic a…
High consanguinity promotes intergenerational wealth concentration in socioeconomically privileged Krummhörn families of the 18th and 19th centuries
Step-Parenting
Effects of Individual Mortality Experience on Out-of-Wedlock Fertility in Eighteenth- and Nineteenth-Century Krummhörn, Germany
Life history theory predicts that exposure to high mortality in early childhood leads to faster and riskier reproductive strategies. Individuals who grew up in a high mortality regime will not overly wait until they find a suitable partner and form a stable union because premature death would prevent them from reproducing. Cox proportional hazard models were used to determine whether women who experienced sibling death during early childhood (0-5…
The impact of kin proximity on net marital fertility and maternal survival in Sweden 1900–1910—Evidence for cooperative breeding in a societal context of nuclear families, or just contextual correlati…
OBJECTIVE: We investigate the association between the geographic proximity of the grandparents on net marital fertility and maternal survival in Sweden, 1900-1910, within the framework of the cooperative-breeding-hypothesis. METHODS: Data were derived from Swedish full-count censuses (1880-1910) and the Swedish Death Index. Married couples were linked to their parental households. Poisson and logistic regression analyses were used to investigate …
Evolutionary Social Sciences
and social sciences.The contributions of the present book were largely presented at these two conferences.In addition, selected further contributions were invited to cover evolutionary social science research in the German-speaking area as broadly as possible.The present work is the first comprehensive overview of evolutionary social science research in the German-speaking area, which is intended to further promote the aforementioned increase in …
The Aftermath of the February Flood of 1825
In February 1825, the dikes broke after a spring tide in the Krummhörn region in East Frisia, Germany, causing a severe disaster. Although the flood did not claim many victims, substantial damage was done to the farmland, and the economic crisis that followed permanently changed the social structure in the Krummhörn. We study family reconstitutions of the region linked to information about socioeconomic status, detailed reports of the flood damag…
Affected by many births, supported by many children? Later-life survival from a life course perspective in three historical populations
Is high fertility related to shorter lifespan? Evolutionary theories predict negative physiological effects of fertility on women’s later-life survival. However, kin and especially one’s own children may contribute positively to women’s survival in old age. Family members may transfer resources and provide caretaking assistance as women age and be a source of social support that contributes to health and survival. This paper focuses on the extent…
Population (12 obras) · Demography (11 obras) · Sociology (11 obras) · Biology (7 obras) · Geography (7 obras) · Demographic Trends and Gender Preferences (6 obras) · Family Dynamics and Relationships (6 obras) · Psychology (6 obras) · Fertility (4 obras) · Demography (3 obras)