Kin Proximity Research Articles

Sample contamination explains evidence of close kin proximity in yellowfin tuna (Thunnus albacares) in the Western and Central Pacific Ocean

Anderson et al.’s 2019 paper ‘Close Kin Proximity in Yellowfin Tuna (Thunnus albacares) as a Driver of Population Genetic Structure in the Tropical Western and Central Pacific’ provided observations of genetically related individuals among sampled yellowfin tuna. Resampling of some individuals from the original study produced very different sequencing results when compared with the original dataset, one possible explanation of which is cross-contamination among the original samples. Re-analyses produced no indication of strong population structure, including a very slightly and consistent heterozygosity deficit with only one statistically significant pairwise FST value of 0.002. We identified only one pair of genetically similar individuals that could still be an artefact of lingering contamination. These new results therefore support a highly connected population of yellowfin tuna in the study area, although we do not rule out the potential for local adaptation driven by non-observed loci or genetic sub-structure operating at more contemporary scales.

Retraction: Close kin proximity in yellowfin tuna (Thunnus albacares) as a driver of population genetic structure in the tropical Western and Central Pacific Ocean

Retraction: Close kin proximity in yellowfin tuna (Thunnus albacares) as a driver of population genetic structure in the tropical Western and Central Pacific Ocean

Keeping kin close? Geographies of family networks by race and income, 1981-2017.

This study examined changes in geographic proximity to family members among race and income groups in the United States from 1981 to 2017. Close geographic proximity to family members can facilitate mutual support and strengthen family bonds. Some scholars argue that institutional sources of support have replaced many core family functions, which might mean that households are likely to live increasingly farther away from family. Advancing technology and changing labor market opportunities might reinforce this pattern. Yet, the ongoing cultural and emotional salience of family might curtail the effects of these factors on the increasing distance to family. We conducted a quantitative analysis of longitudinal data from the Panel Study of Income Dynamics (PSID). We utilized the multigenerational structure of the PSID and restricted-use geocodes to map kin proximity at every interview from 1981 to 2017. We cross-classified our sample by race and income, focusing on Black and White respondents across income quartiles (n = 171,501 person-periods). High-income White respondents showed the greatest increases in distance from kin over time, whereas proximity to kin among other race-income groups was relatively stable. Proximate kin has become less central in the lives of high-income White households over time, whereas close proximity to kin has been the norm over time for other racial and income groups. These results have implications for racial and income differences in kin relations over time.

Kinship, inter- and intraethnic social networks and refugees' division of housework

Objective: This article investigates the role of social connections - kin proximity, premigration friends, and exposure to intra- and interethnic contacts in the host country - in the division of routine housework in refugee couples in Germany. Background: Although social connections are established as an influential factor in the economic and societal integration of newcomers, the role of such connections for the household division of labor among immigrant couples is less understood. Method: Pooled OLS and fixed-effect models were applied to four waves of the longitudinal IAB-BAMF-SOEP Survey of Refugees (2016-2019) to study coupled refugees of working age (1,045 couples, 2,699 couple-years). Results: We find that social connections are significant to the gendered division of routine housework among refugee couples. In particular, networks consisting of new inter- and intraethnic contacts are more influential than those consisting of kins and premigration friends. Moreover, it appears that the kin and new coethnic contacts of the husband are negatively related to their involvement in housework in absolute hours and relative to their wives. Husbands' new contacts with Germans are positively related to their involvement in routine housework. In turn, wives’ contacts with Germans are not associated with a more egalitarian division of housework. Conclusion: Social networks may provide useful explanations for immigrants' domestic behavior, and they should be considered in setting up new policies that guide their integration.

The Influence of Kin Proximity on the Reproductive Success of American Couples, 1900-1910.

Children require a large amount of time, effort, and resources to raise. Physical help, financial contributions, medical care, and other types of assistance from kin and social network members allow couples to space births closer together while maintaining or increasing child survival. We examine the impact of kin availability on couples' reproductive success in the early twentieth-century United States with a panel data set of over 3.1 million couples linked between the 1900 and 1910 U.S. censuses. Our results indicate that kin proximity outside the household was positively associated with fertility, child survival, and net reproduction, and suggest that declining kin availability was an important contributing factor to the fertility transition in the United States. We also find important differences between maternal and paternal kin inside the household-including higher fertility among women residing with their mother-in-law than among those residing with their mother-that support hypotheses related to the contrasting motivations and concerns of parents and parents-in-law.

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 correlations?

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. 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 the association between the geographical proximity of the grandparents on net marital fertility, which we measured as the number of surviving children born between 1900 and 1910, and the mother's survival. Models were fitted with and without fixed effects to assess the effects of unobserved characteristics shared at the parish and the family level. The results indicate that net fertility and maternal survival increased with the husband's parents' geographic proximity. In contrast, we found no evidence that the geographic proximity of the wife's parents was associated with increased fertility or maternal survival. Rather, the presence of the mother's parents in the household lowered net fertility and reduced maternal survival. This study provides evidence that kin proximity was associated with fertility and mortality of married women, and that the associations differed for paternal and maternal kin in the societal context of Swedish nuclear families (1900-1910). However, the patterns of kin proximity that we identified were correlated with characteristics such as socioeconomic status, occupation, and wealth, which also exhibited strong correlations with fertility and survival. Future research assessing the effects of kinship on demographic developments must therefore carefully consider the socio-environmental context.

Social support, nutrition and health among women in rural Bangladesh: complex tradeoffs in allocare, kin proximity and support network size.

Malnutrition among women of reproductive age is a significant public health concern in low- and middle-income countries. Of particular concern are undernutrition from underweight and iron deficiency, along with overweight and obesity, all of which have negative health consequences for mothers and children. Accumulating evidence suggests that risk for poor nutritional outcomes may be mitigated by social support, yet how social support is measured varies tremendously and its effects likely vary by age, kinship and reproductive status. We examine the effects of different measures of social support on weight and iron nutrition among 677 randomly sampled women from rural Bangladesh. While we find that total support network size mitigates risk for underweight, other results point to a potential tradeoff in the effects of kin proximity, with nearby adult children associated with both lower risk for underweight and obesity and higher risk for iron deficiency and anaemia. Social support from kin may then enhance energy balance but not diet quality. Results also suggest that a woman's network of caregivers might reflect their greater need for help, as those who received more help with childcare and housework had worse iron nutrition. Overall, although some findings support the hypothesis that social support can be protective, others emphasize that social relationships often have neutral or negative effects, illustrating the kinds of tradeoffs expected from an evolutionary perspective. The complexities of these effects deserve attention in future work, particularly within public health, where what is defined as 'social support' is often assumed to be positive. This article is part of the theme issue 'Multidisciplinary perspectives on social support and maternal-child health'.

All in the family? The community context of childcare options and parents’ childcare choices

ABSTRACT Childcare in the United States is an important issue impacting parents as they navigate a landscape characterized by challenging choices between parental care only, the price of paid childcare, and largely unpaid kin care. Drawing on guidance from the accommodation model, the current work extends the examination of childcare choices by including non-paid care and by using a sample of families across a broad range of incomes. Data from a statewide childcare survey linked to information regarding proximity of kin, unpaid childare, childcare prices, and other potentially relevant community characteristics are used in the empirical work. Multivariate analyses treat the mother’s employment decision and childcare choices as simultaneous decisions. We find that childcare choices are linked to community caracteristics inlcuding the price of licenced family-based childcare, proximity of kin, the percentage of adults in the community who have a college degree, and the community level unemployment rate. Our work suggests that childcare resource agencies should look at a range of community characteristics beyond area-level poverty rates when identifying communities of high need. The role of childcare information flows from the community to parents should also be the subject of future research.

Kin location and racial disparities in exiting and entering poor neighborhoods

Blacks and Latinos/as are less likely than Whites to move from a poor neighborhood to a non-poor neighborhood and are more likely to move in the reverse direction. Using individual-level data from the Panel Study of Income Dynamics (1980–2013) and neighborhood-level census data, this study explores the role that the spatial location of familial kin networks plays in explaining these racially and ethnically disparate mobility patterns. Blacks and Latinos/as live closer than Whites to nuclear kin, and they are also more likely than Whites to have kin members living in poor neighborhoods. Close geographic proximity to kin and higher levels of kin neighborhood poverty inhibit moving from a poor to a non-poor neighborhood, and increase the risk of moving from a non-poor to a poor tract. Racial/ethnic differences in kin proximity and kin neighborhood poverty explain a substantial portion of racial gaps in exiting and entering poor neighborhoods.

RETRACTED: Close Kin Proximity in Yellowfin Tuna (Thunnus albacares) as a Driver of Population Genetic Structure in the Tropical Western and Central Pacific Ocean

Recent studies argue for the presence of genetic population structure in yellowfin tuna (Thunnus albacares) in all oceans. However, the persistence of family groups has never been considered a viable mechanism of structure, nor has it been measured. We analyzed genetic similarity among 280 yellowfin tunas from seven population samples collected in the Western and Central Pacific Ocean (WCPO) using single nucleotide polymorphisms, and found population structure that was significantly explained by the presence of 96 individuals involved in 332 half or full sib dyads. We found significantly higher mean and median relatedness between individuals from the same sample groups, compared to individuals from different groups; and high relatedness between individuals caught at the same fish-aggregating device (FAD) than between those caught in the wider exclusive economic zone (EEZ). Alternatively, the EEZ of the Federated States of Micronesia may harbor exceptionally large numbers of close kin. We conclude that yellowfin directly school with related individuals through their first year, and at least demonstrate tightly overlapping regional fidelity as adults. These results may explain, to some extent, the patterns of population genetic structure recently observed in yellowfin tuna.

Beyond household walls: the spatial structure of American extended kinship networks

ABSTRACT How far do Americans live from their close and extended kin? The answer is likely to structure the types of social, instrumental, and financial support that they are able to provide to one another. Based on the Panel Study of Income Dynamics, kin pairs vary widely in odds of household co-residence, co-residence in the same administrative units, and inter-tract distances if they do not live in the same census tract. Multivariate regression tests show that family structure, educational attainment, and age are closely associated with kin proximity. Fixed-effects models demonstrate that family formation shapes spatial relations between kin.

Mapping family connectedness across space and time

Understanding the structure and evolution of family networks embedded in space and time is crucial for various fields such as disaster evacuation planning and provision of care to the elderly. Computation and visualization can potentially play a key role in analyzing and understanding such networks. Graph visualization methods are effective in discovering network patterns; however, they have inadequate capability in discovering spatial and temporal patterns of connections in a network especially when the network exists and changes across space and time. We introduce a measure of family connectedness that summarizes the dynamic relationships in a family network by taking into account the distance (how far individuals live apart), time (the duration of individuals’ coexistence within a neighborhood), and the relationship (kinship or kin proximity) between each pair of individuals. By mapping the family connectedness over a series of time intervals, the method facilitates the discovery of hot spots (hubs) where family connectedness is strong and the changing patterns of such spots across space and time. We demonstrate our approach using a data set of nine families from the US North. Our results highlight that family connectedness reflects changing demographic processes such as migration and population growth.

Alternatives to the Grandmother Hypothesis

We conducted a meta-analysis of 17 studies that tested for an association between grandparental survival and grandchild survival in patrilineal populations. Using two different methodologies, we found that the survival of the maternal grandmother and grandfather, but not the paternal grandmother and grandfather, was associated with decreased grandoffspring mortality. These results are consistent with the findings of psychological studies in developed countries (Coall and Hertwig Behavioral and Brain Sciences 33:1-59, 2010). When tested against the predictions of five hypotheses (confidence of paternity; grandmothering, kin proximity, grandparental senescence, and local resource competition), our meta-analysis results are most in line with the local resource competition hypothesis. In patrilineal and predominantly patrilocal societies, the grandparents who are most likely to live with the grandchildren have a less beneficial association than those who do not. We consider the extent to which these results may be influenced by the methodological limitations of the source studies, including the use of retrospective designs and inadequate controls for confounding variables such as wealth.

Kin selection in Columbian ground squirrels ( Urocitellus columbianus ): littermate kin provide individual fitness benefits

Since W. D. Hamilton's seminal work on the evolution of sociality, a large body of research has accumulated on how kin selection might explain the evolution of cooperation in many group-living species. Our study examined the evolutionary basis of philopatry and cooperation; specifically, whether individuals benefit from the presence of close kin. We applied an individual fitness approach to a 16-year study of Columbian ground squirrels (Urocitellus columbianus) to investigate potential causal paths by which the presence of kin might act on individual fitness. Our results indicate that individual fitness benefits resulted from associations of philopatric female kin, and support the hypothesis that increased tolerance of proximity of kin is a proximate mechanism for these benefits. The major life-history influence of kin on individual fitness was through improved reproductive success, and this benefit may have been owing to philopatric settlement of kin that were recognized through familiarization in the natal burrow. Thus, we demonstrated an evolutionary basis necessary for ongoing kin-selected cooperation in Columbian ground squirrels, though the mechanism of familiarity may determine which kin individuals benefit from cooperative behaviours.

Family matters: The impact of kin on the mortality of the elderly in rural Bangladesh

This study uses high quality longitudinal data on kin availability, proximity, and marital status from the Matlab surveillance area in rural Bangladesh to explore the impact of kin members on the survival of the elderly over a six year period. The results - from discrete time hazard models- suggest that the presence of a spouse, sons, and brothers substantially improves survivorship, but with differing effects by the sex of the elderly and the number of sons and brothers. This study offers little support of any of the following as mechanisms by which kin affect the survival of the elderly: changes in the economic status of the elderly as proxied by land holdings; improved access to instrumental support as proxied by the marital status of sons; decreases in social isolation as proxied by proximity of kin.

Reply [to Commentaries on "Race, Gender, Class, and Health" Issue

welcome the opportunity to respond to the commentaries directly related to my article on gender and generation poor women's household health production experiences. First, I found Porter's theoretical critique of gender and generation the household production of health both incisive and important to further research and theory building. I echo her concern that ethnic effects must be disentangled from class and status effects. As Rubel and Murray (1993:22) also observe, in failing to consider how social class factors mitigate the influence of ethnicity, the analytic power of the latter is defused. For good reason, the struggle to differentiate between situational contexts (such as degrees of poverty or proximity of kin) contrast to culturally influenced patterns of relationships will continue to consume researchers. I agree with Barbee, however, that for most of us, the relative influence of poverty, proximity of kin, culture, or gender on our behavior cannot be parcelled out experience. My interest was primarily women's experience household health production all its confounded complexity. Future research, my own included, must take careful account of the ways concepts are conceived, linked, and then communicated, order to avoid theoretically unexciting results. Another issue addressed the commentaries is a question of scope or, as Barbee summed it up, problems of ignoring the larger social order the production of poverty for Mexican American women. To clarify, my research was about the production of health, not the production of poverty. Because poverty influences household behaviors affecting health, the research design attempted to control for those effects by selecting households already poverty as participants. Why they lived poverty or how social injustices facilitated a heavier poverty burden among the Mexican American households was beyond the immediate scope of this research.

Family support networks among elders in a native American community: Contact with children and siblings among the prairie band potawatomi

Although a great deal is known about family support networks among older whites, little is known about the workings of family support networks among elderly Native Americans. Face-to-face interviews focused on the availability and proximity of kin and the frequency of nine common family activities with each child and sibling. The effects of proximity, gender, marital status, and the equity of helping relationships on family support network operation are analyzed revealing similarities and differences with previous research findings among Anglos. Differences with previous research findings include that the strongest sibling tie is between brothers rather than between sisters, the presence of a spouse insulates elders rather than invigorates contact within the network, and marital dissolution (whether through widowhood, divorce or separation) does not isolate elders from children or siblings. The study concludes with suggestions for future research to refine our understanding of family support network operation.

Giving between generations in American families

This paper documents the types and amounts of aid exchanged between adults and their non-coresidential parents. Data for the study are drawn from a representative national sample survey of Americans age 19 and older conducted in 1987-1988. Exchanges of monetary and material resources, childcare, household assistance, and companionship and advice are considered.Patterns of intergenerational exchange are found to differ by gender, family structure, age, ethnicity, and socioeconomic situation. Differences in exchange between males and females and between whites and Mexican-Americans are related to other life-course characteristics, and to the availability and proximity of kin. Blacks and persons living in poverty are shown to be less involved than other groups in intergenerational exchanges. Finally, patterns of prior assistance and the available needs and resources of the respondents and their parents are found to influence current patterns of exchange.

Family networks in prenatal and postnatal health

This paper examines the effects of kin access on prenatal health practices, birth outcome, and postnatal health practice for infants born to black and white mothers ages 21 to 28 in the U.S. during 1984-86. The data used for this research were compiled from three sources: (1) The National Longitudinal Survey of Youth; (2) The Children of the National Longitudinal Survey of Youth; (3) special kin access data files, which were created specifically for this study. Logistic regression procedures are used to assess the effects of kin proximity, maternal grandmother proximity, and presence of the child's father on health practices (N = 1,030) and birth outcome (N = 1,385), controlling for the mother's educational attainment, work experience, poverty, presence of the child's father, and birth order of the child. We find no evidence supporting the notion that kin access positively affects the prenatal and postnatal health practices of young mothers. The results suggest that young mothers who reside with their mothers or other adult kin, and those who are in close proximity to them, are no more likely to seek prenatal care during the first trimester, or to avoid smoking or drinking during pregnancy. Mothers who live with a sexual partner or husband are, however, somewhat more likely to seek prenatal care and to avoid alcohol use during pregnancy. Closer kin access is associated with a lower probability of breastfeeding. These results suggest that it will not be adequate to rely on kin networks or kin assistance to improve the prospect of healthy birth outcomes.

Primary-Group Differentiation in Urban Ireland

This research attempts to replicate and extend the work of Litwak and Szelyeni on primary group structures in Hungary and the United States. Their findings indicated that proximity of kin and occupation affected primary-group relationships. Employing data drawn from interviews with 686 Irish women, we generally confirmed their findings; however, by means of a step-wise regression procedure we were able to show that occupational prestige was negatively correlated with kin usage in our three time-demand situations because of its association with low fertility in respondent's families of orientation and higher rates of geographic mobility.