A conceptual model for the identification, organization, and measure of influence of fertility policies and programs.

The fertility program of any government is the procedural action intended to effect the government fertility policy. There may also be unintended results of any fertility program. A conceptual model was designed to measure the effect of governmental action on fertility and to identify sociocultural factors that have the greatest influence on fertility. The model uses sociocultural variables as intervening variables between fertility programs and changes in actual fertility. The structural variables considered by the model are characteristics of the pattern of social order; the cultural variables consist of shared values and norms. Fertility trend analysis is effected by polynomial regression formulae. Puerto Rican data from 1946 to 1970 were used to test the proposed model. Analysis of the data indicated that emigration between 1940-1962 had little effect on national fertility. Governmental family planning programs, beginning in 1946, contributed to a sharp decline in fertility. It is recommended that the model be used with data from other countries to assess the effects of their family planning programs.     

The other facets of family life and their role in the evolution of animal sociality

Family life forms an integral part of the life history of species across the animal kingdom and plays a crucial role in the evolution of animal sociality. Our current understanding of family life, however, is almost exclusively based on studies that (i) focus on parental care and associated family interactions (such as those arising from sibling rivalry and parent‐offspring conflict), and (ii) investigate these phenomena in the advanced family systems of mammals, birds, and eusocial insects. Here, we argue that these historical biases have fostered the neglect of key processes shaping social life in ancestral family systems, and thus profoundly hamper our understanding of the (early) evolution of family life. Based on a comprehensive survey of the literature, we first illustrate that the strong focus on parental care in advanced social systems has deflected scrutiny of other important social processes such as sibling cooperation, parent–offspring competition and offspring assistance. We then show that accounting for these neglected processes – and their changing role over time – could profoundly alter our understanding of the origin and subsequent evolution of family life. Finally, we outline how this ‘diachronic’ perspective on the evolution of family living provides novel insights into general processes driving the evolution of animal sociality. Overall, we infer that the explicit consideration of thus‐far neglected facets of family life, together with their study across the whole diversity of family systems, are crucial to advance our understanding of the processes that shape the evolution of social life.     

Evaluation of large‐scale genetic structure in complex demographic and historical scenarios: The mitochondrial DNA and Y‐chromosome pools of the Iberian Atlantic façade

Genetic structural patterns of human populations are usually a combination of long‐term evolutionary forces and short‐term social, cultural, and demographic processes. Recently, using mitochondrial DNA and Y‐chromosome loci, various studies in northern Spain have found evidence that the geographical distribution of Iron Age tribal peoples might have influenced current patterns of genetic structuring in several autochthonous populations. Using the wealth of data that are currently available from the whole territory of the Iberian Peninsula, we have evaluated its genetic structuring in the spatial scale of the Atlantic façade. Hierarchical tree modeling procedures, combined with a classic analysis of molecular variance (AMOVA), were used to model known sociocultural divisions from the third century BCE to the eighth century CE, contrasting them with uniparental marker data. Our results show that, while mountainous and abrupt areas of the Iberian North bear the signals of long‐term isolation in their maternal and paternal gene pools, the makeup of the Atlantic façade as a whole can be related to tribal population groups that predate the Roman conquest of the Peninsula. The maintenance through time of such a structure can be related to the numerous geographic barriers of the Iberian mainland, which have historically conditioned its settlement patterns and the occurrence of genetic drift processes. Am J Phys Anthropol 153:617–626, 2014. © 2013 Wiley Periodicals, Inc.     

The XRCC3 Thr241Met polymorphism and breast cancer risk: a case–control study in a Thai population

The X-ray repair cross-complementing group 3 gene (XRCC3) belongs to a family of genes responsible for repairing DNA double-strand breaks caused by normal metabolic processes and exposure to ionizing radiation. Polymorphisms in DNA repair genes may alter an individual's capacity to repair damaged DNA and may lead to genetic instability and contribute to malignant transformation. We examined the role of a polymorphism in the XRCC3 gene (rs861529; codon 241: threonine to methionine change) in determining breast cancer risk in Thai women. The study population consisted of 507 breast cancer cases and 425 healthy women. The polymorphism was analysed by fluorescence-based melting curve analysis. The XRCC3 241Met allele was found to be uncommon in the Thai population (frequency 0.07 among cases and 0.05 among controls). Odds ratios (OR) adjusted for age, body mass index, age at menarche, family history of breast cancer, menopausal status, reproduction parameters, use of contraceptives, tobacco smoking, involuntary tobacco smoking, alcohol drinking, and education were calculated for the entire population as well as for pre- and postmenopausal women. There was a significant association between 241Met carrier status and breast cancer risk (OR 1.58, 95% confidence interval (CI) 1.02–2.44). Among postmenopausal women, a slightly higher OR (1.82, 95% CI 0.95–3.51) was found than among premenopausal women (OR 1.48, 95% CI 0.82–2.69). Our findings suggest that the XRCC3 Thr241Met polymorphism is likely to play a modifying role in the individual susceptibility to breast cancer among Thai women as already shown for women of European ancestry.     

Demographic Dimensions of an Intervillage Land Dispute in Nubri, Nepal

The demographic basis for a land dispute between two Tibetan villages in Nubri, Nepal, is examined in relation to family systems. Despite close proximity and sociocultural ties, the villages experience divergent population growth rates resulting from different frequencies of marriage. In one, old-age security concerns induce parents to retain female labor within the household by designating daughters to be nuns, a practice that has the unintended consequence of limiting aggregate population growth by barring many women from marriage and reproduction. In the other village the slightly different family system results in fewer nuns, faster population growth, and a need for more land. Comparisons with family systems and demographic outcomes in Europe and Asia reveal this to be a case in which preventive checks can exist in a context of early marriage and high marital fertility and demonstrate how concerns for old-age security can act as a restraint on aggregate fertility. [ Tibetans, family systems, demography, religious celibacy ]     

Social and family characteristics of marriage in England and Wales: information derived from marriage registration records

Information on social and family aspects of marriage was obtained from a sample of over a thousand marriages solemnised in England and Wales in 1979. The data include the standard demographic variables concerning the couple and their marriage and also: the day of the week the marriage was celebrated; whether the fathers or relatives of similar surname to the spouses acted as witnesses; the patterns of name usage by brides; the numbers of forenames of the marriage partners and their fathers; and the frequency of bridegrooms having one or more forenames in common with their fathers. The factors are analysed in terms of social class differences as well as in relation to the distance over which marriages range and other demographic characteristics of the partners and their marriage.     

Abortion in Canada: religious and ideological dimension's of women's attitudes

This paper examines a number of demographic and sociocultural factors (e.g., age, marital status, family size, religion, religious assiduity, sex-role ideology) as predictors of women's attitudes toward abortion, using data from the Canadian Fertility Survey of 1984. The findings suggest that women's abortion attitudes are to a greater extent based on ideological positions. It appears that anti-abortion stance affects those women who are religious, presumably by increasing the relationship between their general sex-role ideological stances and abortion attitudes. Abortion attitudes also vary according to a woman's education, her size, and province/region of residence.     

Clustering Analysis of a Colombian Toxicological Database

The database analysis allows the return of experience needed to support decision-making processes in risk management. A Colombian toxicological database (TED) developed and maintained by the Center of Safety Information and Chemical Products (CISPROQUIM by its Spanish abbreviation in) is analyzed here using a demographic clustering technique. Data-quality processes were performed on the raw data (more than 170 variables) and as a result the database was reduced to 20 meaningful variables. The variables characterized by values with categories were selected for clustering analysis: gender, age, type of emergency, emergency location, means of poisoning, product use, and physical state of the toxic substance. Clustering analysis showed that there are three profiles that are prevalent in the TED database: Young Adult Suicidal Woman, Unsupervised Child, and Man at Work. These profiles could not be identified using traditional statistical analyses performed on the data collected by CISPROQUIM or defined a priori from the categorical variables. The identification of vulnerable populations and the cause of the toxicological events are critical in order to develop national prevention programs and policies. The analysis described provided a methodology for a critical analysis of toxicological databases that can be applied to other databases such as security databases.     

Social carry‐over effects underpin trans‐seasonally linked structure in a wild bird population

Spatial structure underpins numerous population processes by determining the environment individuals' experience and which other individuals they encounter. Yet, how the social landscape influences individuals' spatial decisions remains largely unexplored. Wild great tits (Parus major) form freely moving winter flocks, but choose a single location to establish a breeding territory over the spring. We demonstrate that individuals' winter social associations carry‐over into their subsequent spatial decisions, as individuals breed nearer to those they were most associated with during winter. Further, they also form territory boundaries with their closest winter associates, irrespective of breeding distance. These findings were consistent across years, and among all demographic classes, suggesting that such social carry‐over effects may be general. Thus, prior social structure can shape the spatial proximity, and fine‐scale arrangement, of breeding individuals. In this way, social networks can influence a wide range of processes linked to individuals' breeding locations, including other social interactions themselves.     

Parental perceptions of costs and benefits of children as correlates of fertility in Kuwait

Kuwait is a high fertility country where the average number of desired children still exceeds 5. However, fertility behaviour is beginning to show a noticeable change and the current TFR is about 4.2 children. In order to understand the decline in fertility, the impact of perceived benefits and costs of children on Kuwaiti women's desired and achieved fertility is analysed. Data from a nationally representative survey of Kuwaiti households held in 1999 are used. Bivariate analyses show that the mean desired number of children is significantly higher among those who rank higher on the perceived value of children, and lower among those who are concerned about the cost of raising children. Achieved fertility (children ever born) shows a similar pattern. In the multivariate analysis, however, large family values emerge as the only significant predictor of (higher) desired as well as achieved fertility, net of the respondent's demographic and socioeconomic characteristics. The sociocultural, economic and political contexts that shape the mother's perceptions of the benefits and costs of children are analysed and it is concluded that the need for children as social and national capital is currently the most important driving force behind fertility desires and behaviour.     

Quaternary range and demographic expansion of Liolaemus darwinii (Squamata: Liolaemidae) in the Monte Desert of Central Argentina using Bayesian phylogeography and ecological niche modelling

Until recently, most phylogeographic approaches have been unable to distinguish between demographic and range expansion processes, making it difficult to test for the possibility of range expansion without population growth and vice versa. In this study, we applied a Bayesian phylogeographic approach to reconstruct both demographic and range expansion in the lizard Liolaemus darwinii of the Monte Desert in Central Argentina, during the Late Quaternary. Based on analysis of 14 anonymous nuclear loci and the cytochrome b mitochondrial DNA gene, we detected signals of demographic expansion starting at ~55 ka based on Bayesian Skyline and Skyride Plots. In contrast, Bayesian relaxed models of spatial diffusion suggested that range expansion occurred only between ~95 and 55 ka, and more recently, diffusion rates were very low during demographic expansion. The possibility of population growth without substantial range expansion could account for the shared patterns of demographic expansion during the Last Glacial Maxima (OIS 2 and 4) in fish, small mammals and other lizards of the Monte Desert. We found substantial variation in diffusion rates over time, and very high rates during the range expansion phase, consistent with a rapidly advancing expansion front towards the southeast shown by palaeo‐distribution models. Furthermore, the estimated diffusion rates are congruent with observed dispersal rates of lizards in field conditions and therefore provide additional confidence to the temporal scale of inferred phylogeographic patterns. Our study highlights how the integration of phylogeography with palaeo‐distribution models can shed light on both demographic and range expansion processes and their potential causes.     

Homogeneously sized groups increase aggressive interaction and affect social stress in Thai strain Nile tilapia (Oreochromis niloticus)

Social fish raised in farms are usually kept in groups of similar-sized individuals. However, social animals of similar size typically have similar fighting ability, which increases aggressive interaction for social rank establishment, as well as social stress. We compared Thai strain Nile tilapia fish, Oreochromis niloticus (L.), held under two treatments: (1) The Homogeneous one, with five adult male fish of similar size and (2) the Heterogeneous treatment with five adult males of different sizes. We recorded the frequency of aggressive interactions and checked social stability and stress levels (cortisol) after five days in the groups. Grouping similar sized Thai Nile tilapia increased the aggressive interactions and delayed rank stability with increased body injuries as a consequence. Homogeneous-sized individuals showed a similar level of stress while heterogeneous-sized individuals showed different stress levels with dominants being more stressed than subordinates. The data indicate that the practice of selecting fish of similar size in aquaculture management could reduce the welfare of social fish and that the effect is observed in different lineages.     

The past,present and future of skeletal analysis in palaeodemography

The study of past population dynamics is imperative to our understanding of demographic processes in the context of biology, evolution, environment and sociocultural factors. Retrospective consideration of a population''s capacity to resist and adapt to change aims to contribute insights into our past, a point of comparison to the present and predictions for the future. If these aims are to be achieved, the accuracy and precision of palaeodemographic methods are of paramount importance. This article considers the emergence of skeletally based palaeodemographic methods, specifically life tables and demographic proxies, and early controversies and issues. It details the process of methodological development and refinement, and success in addressing many of the historical limitations. The contribution and potential of skeletally based methods are discussed and comparisons and contrasts made with alternative palaeodemographic approaches, and avenues for future research are proposed. Ultimately, it is concluded that skeletal analysis provides unique opportunities to investigate population dynamics with spatial specificity, examine individuals and groups within a population, and integrate demographic and pathological information to evaluate population health in the past.This article is part of the theme issue ‘Cross-disciplinary approaches to prehistoric demography''.     

Migration and Ethnobotanical Practices: The Case of <Emphasis Type="Italic">Tifey</Emphasis> Among Haitian Immigrants in Cuba

Ethnobotanical knowledge and practices are dynamic and they change as they are transferred and appropriated by people who are adapting to new surroundings and changing environments. Using tifey, a multispecies drink, as a case study, we discuss the changes that emigration brought about related to tifey, and the processes that determined these changes. Tifey is a Haitian drink prepared by soaking Artemisia absinthium and other plants in rum or aguardiente. It probably had its origin in the adoption of the absinthe-based liquor used by French settlers and troops during the colonial period. Haitians progressively added culturally relevant flavorings and medicinal plants to this drink, and differentiated its production and use for medicinal, medicinal food, ritual (religious and social), and economic purposes. When Haitians migrated to Cuba, they brought tifey with them, but over the course of the twentieth century its use declined and its composition changed due to sociocultural factors such as the dissolution of Haitian settlements, and to ecological factors such as difficulty in cultivation and/or procurement of A. absinthium in the new environment.     

Demographic variance in heterogeneous populations: matrix models and sensitivity analysis

The demographic consequences of stochasticity in processes such as survival and reproduction are modulated by the heterogeneity within the population. Therefore, to study effects of stochasticity on population growth and extinction risk, it is critical to use structured population models in which the most important sources of heterogeneity (e.g. age, size, developmental stage) are incorporated as i‐state variables. Demographic stochasticity in heterogeneous populations has often been studied using one of two approaches: multitype branching processes and diffusion approximations. Here, we link these approaches, through the demographic stochasticity in age‐ or stage‐structured matrix population models. We derive the demographic variance, σ²_d, which measures the per capita contribution to the variance in population growth increment, and we show how it can be decomposed into contributions from transition probabilities and fertility across ages or stages. Furthermore, using matrix calculus we derive the sensitivity of σ²_d to age‐ or stage‐specific mortality and fertility. We apply the methods to an extensive set of data from age‐classified human populations (long‐term time‐series for Sweden, Japan and the Netherlands; two hunter–gatherer populations, and the high‐fertility Hutterites), and to a size‐classified population of the herbaceous plant Calathea ovandensis. For the human populations our analysis reveals substantial temporal changes in the demographic variance as well as its main components across age. These new methods provide a powerful approach for calculating the demographic variance for any structured model, and for analyzing its main components and sensitivities. This will make possible new analyses of demographic variance across different kinds of heterogeneity in different life cycles, which will in turn improve our understanding of mechanisms underpinning extinction risk and other important biological outcomes.     

Comparative studies of the population structure of a Kurd village population of Southeast Turkey. II. Morphologic differentiation within the population

A small scale village society from southern Turkey has been investigated by demographic, social and anthropological criteria. An internal differentiation of the population on the basis of demographic and social data could be verified for morphological features, too. This is shown clearly by a differentiation of the population into two family complexes. The consequences for the interpretation of metrical random sample surveys in typological investigations are discussed.     

Community perceptions of reasons for preference for consanguineous marriages in Pakistan

Although the recent Pakistan Demographic and Health Survey (DHS) show that two-thirds of marriages in Pakistan are consanguineous, the sociocultural determinants of such marriages remain largely unexplored. This paper examines the relative importance of the three commonly perceived reasons for such marriages: religious, economic and cultural. The analysis is based on qualitative data collected in 1995 from multi-ethnic and multi-religious communities in Karachi, the largest city of Pakistan. Results show that consanguineous marriages are preferred across all ethnic and religious groups to a varying degree, and that parents continue to be the prime decision-makers for marriages of both sons and daughters. The major reasons for a preference for consanguineous marriages are sociocultural rather than any perceived economic benefits, either in the form of consolidation of family property or smaller and less expensive dowries. Among Muslims, following religious traditions is the least commonly cited reason for such marriages. Despite the reported sociocultural advantages of consanguineous marriages, such unions are perceived to be exploitative as they perpetuate the existing power structures within the family.     

Genetic structure of the feral cat (Felis catus L.) introduced 50 years ago to a sub-Antarctic island

Information about the invasion dynamics and demographic status of invasive species is essential to choose the optimal control options of population numbers. While long-term direct demographic and historical records are generally lacking, the analysis of the genetic variability of a current population might supply information about past and current demographic processes. In this study, we analysed the genetic variability of the cat population living on the main island of the Kerguelen archipelago. Genetic diversity was consistent with the introduction of a very small number of individuals followed by a demographic explosion of the cat population. Significant genetic structure among sites (F_st=0.06 ±0.005) and absence of isolation by distance could indicate that the initial phase of fast colonisation is now over. Estimates of individual relatedness indicated a significant kin structure. Overall data suggested that the cat population of the main island has probably reached carrying capacity.     

Population studies,Reproductive Behavior and family composition: Some theoretical considerations

Human populations are characterized by their heterogeneity, as much cultural as biological. This is why they can but the considered as complex entities. On the one side, this means going beyond the typological approach of traditional physical anthropology and thinking in terms of evolutionary processes, that is to say, population reproduction. On the other side, this implies developing an integrated view which takes into account as much cultural processes as demographic, socio-economic or biological ones. This paper aims to show, in this regard, the pertinence of taking the family as the unit of analysis. Yet, it is not enough to consider family structure, i.e. the composition of the domestic group, but one needs to understand the kinship system on which it is based and its dynamics. This is done by examining the different stages through which the family goes along its life cycle. We close these theoretical considerations by briefly illustrating them with our data on fertility and household composition in two different populations from the Altos de Chiapas in Mexico.