Polygamy

BACKGROUND: Typical ageing changes and the associated health concerns frequently manifest themselves as reduction in their efficiency and functional capacity. OBJECTIVE: To identify the socioeconomic and lifestyle determinants of the functional capacity of elderly patients. METHODS: A cross-sectional study involving 329 patients aged ≥ 60 years who presented to the General Outpatient Clinic. Data on socioeconomic, lifestyle, and functional capacity were collected...

Although over 50 y have passed since W. D. Hamilton articulated kin selection and inclusive fitness as evolutionary explanations for altruistic behavior, quantifying inclusive fitness continues to be challenging. Here, using 30 y of data and two alternative methods, we outline an approach to measure lifetime inclusive fitness effects of cooperative polygamy (mate-sharing or cobreeding) in the cooperatively breeding acorn woodpecker Melanerpes formicivorus . For both sexes, the number of offspring (observed direct fitness) declined while the number of young parented by related cobreeders (observed indirect fitness effect) increased with cobreeding coalition size...

INTRODUCTION: Polygamy has declined in the last decade, but it is still prevalent in West African nations including Ghana even with the arrival of Christianity and colonists, which came to be recognized as a form of slavery that needed to be abolished. AIM: To analyze the determinants of polygyny among married Christian women in Ghana. METHODS: Ghana Maternal Health Survey data was used for this study to do an analytic cross-section study...

A widespread effect of climate change is the displacement of organisms from their thermal optima. The associated thermal stress imposed by climate change has been argued to have a particularly strong impact on male reproduction but evidence for this postulated sex-specific stress response is equivocal.One important factor that may explain intra- and interspecific variation in stress responses is sexual selection, which is predicted to magnify negative effects of stress. Nevertheless, empirical studies exploring the interplay of sexual selection and heat stress are still scarce...

Differences in the strength of sexual selection between males and females can lead to sexual dimorphism. Extra-pair paternity (EPP) can increase the variance in male reproductive success and hence the opportunity for sexual selection. Previous research on birds suggests that EPP drives the evolution of dimorphism in plumage colour and in body size. Because EPP increases the intensity of sexual selection in males, it should lead to increased dimorphism in species with larger or more colourful males, but decreased dimorphism in species with larger or more colourful females...

BACKGROUND: In Ethiopia high population growth and unintended pregnancies are posing pressures where the economy is incapable of holding overpopulation. Despite this problem, utilization of modern contraception is low in rural areas of the country, especially in the areas where polygamy is common. Therefore, this study was conducted to assess contraceptive utilization and associated factors among polygamous and monogamous women in, Ethiopia. METHOD: A community-based comparative cross-sectional and phenomenological study design was employed from July 1 to September 30, 2021, on the total sample size of 774 selected married women of the reproductive age group by using a multistage sampling method and a purposive sampling method were used for the qualitative part of the study...

Good genes theories of sexual selection predict that polygamy will be associated with more efficient removal of deleterious alleles (purifying selection), due to the alignment of sexual selection with natural selection. On the other hand, runaway selection theories expect no such alignment of natural and sexual selection, and may instead predict less efficient purifying selection in polygamous species due to higher reproductive variance. In an analysis of polymorphism data extracted from 150-bird genome assemblies, we show that polygamous species carry significantly fewer nonsynonymous polymorphisms, relative to synonymous polymorphisms, than monogamous bird species (p = ...

BACKGROUND: This study aimed to investigate the prevalence of domestic violence (DV) against women who are undergoing methadone maintenance therapy (MMT) and its related risk factors. METHODS: This case-control study was conducted on 195 women who were under MMT and a control group consisting of 195 women who were not under it in the city of Zahedan from 22 May to 1 December 2019. Data were collected using a questionnaire for the measurement of violence against women and a sociodemographic questionnaire...

AbstractGene drive technology promises to deliver on some of the global challenges humanity faces today in health care, agriculture, and conservation. However, there is a limited understanding of the consequences of releasing self-perpetuating transgenic organisms into wild populations under complex ecological conditions. In this study, we analyze the impact of three such complexities-mate choice, mating systems, and spatial mating network-on the population dynamics for two distinct classes of modification gene drive systems...

Mating rate optima often differ between the sexes: males may increase their fitness by multiple mating, but for females multiple mating confers little benefit and can often be costly (especially in taxa without nuptial gifts or mala parental care). Sexually antagonistic evolution is thus expected in traits related to mating rates under sexual selection. This prediction has been tested by multiple studies that applied experimental evolution technique, which is a powerful tool to directly examine the evolutionary consequences of selection...

Female genital mutilation (FGM) is justified by sociocultural arguments, including that it guarantees girls'/women's appropriate sexual behavior, thus preserving family honor. We explored the perspectives of Guineans who do not practice FGM ("positive deviants"), as well as of Guineans who still practice FGM but who are supportive of abandoning the practice ("reluctant adherents"). We conducted a "focused ethnographic" study in Conakry, Guinea with a sample of 58 people. Individual semi-structured interviews were undertaken to explore the views and experiences of 18 women and 12 men of different generations who abandoned the practice of FGM...

BACKGROUND: Despite vaccine and antiviral treatment availability, hepatitis B virus (HBV) continues to circulate among pregnant women in Iraq. HBV spread is due to many factors. This study evaluated HBV prevalence among pregnant women and Syrian refugees residing in Zakho city, Iraq, and identified risk factors associated with infection. MATERIALS AND METHODS: Demographic data were collected from 2,054 pregnant women via a questionnaire assessing risk factors associated with HBV infection...

Cryptic female choice (CFC) is commonly assumed to act only in polyandrous mating systems, which allows females to bias fertilization towards the sperm of particular males. However, accumulated evidence has demonstrated that sperm show significant phenotypic and genotypic variation also within single ejaculates, which have important consequences for offspring phenotype and fitness. Here, I argue that these neglected sources of intra-male sperm variation often allow CFC to act also within individual males and facilitate fertilization bias towards genetically compatible (or otherwise preferred) sperm haplotypes...

OBJECTIVE: The study was aimed at examining the magnitude, trends and determinants of grand multiparity in the Sidama regional state of Ethiopia. DESIGN: We retrieved cross-sectional data from the Ethiopia Demographic and Health Survey from 2000 to 2016. SETTING: Community-based demographic and health survey (DHS) was conducted in Ethiopia. PARTICIPANTS: The study population was women (aged 15-49 years) who had delivered children with the available DHS data set...

INTRODUCTION: Modern contraception use is the fundamental fulfilment of women's rights to choose when and how many children to have. The study explored predictors of modern contraceptive use among women in Zimbabwe. METHOD: Data from the 1999, 2005/2006, 2010/2011 and 2015 Zimbabwe Demographic and Health Survey (ZDHS) was used in a secondary analysis that involved 5474 women of reproductive age. The outcome measure was modern contraceptive use as reported by women...

Plant sexual dimorphism is thought to evolve in response to sex-specific selection associated with competition for access to mates or resources, both of which may be density-dependent. In wind-pollinated plants in particular, vegetative traits such as plant size and architecture may influence resource acquisition and both pollen dispersal and receipt, with potential conflict between these two components of fitness. We evaluated the role of plant density in shaping plant traits by measuring evolutionary responses in experimental populations of the sexually dimorphic wind-pollinated plant Mercurialis annua...

Background: Contraceptive use in Nigeria has been consistently low despite its many benefits and several efforts by government and development partners to increase its uptake. According to the Nigeria Demographic and Health Survey, the use of any modern method staggeringly increased from 4 to 12% over 28 years (1990-2018). Studies have identified factors at the individual, household, and societal levels that affect contraceptive use. While studies have also shown that decisions such as contraceptive behavior and acquisition of family skills may vary according to the individual or societal factors, there is a dearth of knowledge on how household structure and composition influence contraceptive use in Nigeria...

Behavior is central to interactions with the environment and thus has significant consequences for individual fitness. Sexual selection and demographic processes have been shown to independently shape behavioral evolution. Although some studies have tested the simultaneous effects of these forces, no studies have investigated their interplay in behavioral evolution. We applied experimental evolution in the seed beetle Callosobruchus maculatus to investigate, for the first time, the interactive effects of sexual selection intensity (high [polygamy] vs...

Background: Almost 1 million pregnant women were estimated to be infected with syphilis in 2016, resulting in over 350,000 adverse birth outcomes including 200,000 stillbirths and new-born deaths (7-9). More than half of infected pregnant women transmit the infection to their babies, resulting in adverse pregnancy outcomes, including foetal death, stillbirth, preterm birth, low birth weight, neonatal death, and congenital infection in infants. Objective: The objective of the study was to assess the syphilis status and associated factors among pregnant women attending antenatal care in Kule refugee camp health facilities, Gambella regional state, Southwest Ethiopia, in 2021...

Background : Ensuring the nutritional status of lactating women is crucial to prevent maternal morbidity and mortality in poor countries like Ethiopia. Hence, this study aimed to assess the prevalence of undernutrition and its associated factors among lactating women in Shebedino district, Sidama Regional State, Ethiopia. Methods : A community-based cross-sectional study was conducted among randomly selected 612 lactating women from February to March 2020. Data were collected by using an interviewer-administered, structured, and pretested questionnaire...