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Trading sex

Ricardo Pagan
BACKGROUND: Although sleep is considered an essential part of individuals' lives, there are no previous studies analysing how sleep duration affects the levels of life satisfaction reported by males and females with disabilities. OBJECTIVE/HYPOTHESIS: To analyse and compare the impact of hours of sleep on life satisfaction scores reported by people without and with disabilities (stratified by sex) in Germany. METHODS: Using data taken from the German Socio-Economic Panel for the period 2008-2013, we estimate life satisfaction equations for males and females (running a fixed-effects model) which include a set of variables measuring the number of sleep hours on workdays and weekends...
October 11, 2016: Disability and Health Journal
Sandra A Heldstab, Carel P van Schaik, Karin Isler
Humans stand out among non-aquatic mammals by having both an extremely large brain and a relatively large amount of body fat. To understand the evolution of this human peculiarity we report a phylogenetic comparative study of 120 mammalian species, including 30 primates, using seasonal variation in adult body mass as a proxy of the tendency to store fat. Species that rely on storing fat to survive lean periods are expected to be less active because of higher costs of locomotion and have increased predation risk due to reduced agility...
November 2016: Journal of Human Evolution
Gladys E Ibañez, Elaine Whitt, Tenesha Avent, Steve S Martin, Leah M Varga, Miguel A Cano, Daniel J O'Connell
OBJECTIVES: Latina women are disproportionately affected by HIV in the US, and account for 30% of all HIV infections in Miami-Dade County, Florida. The main risk for Latina women is heterosexual contact. Little is known about the relational and cultural factors that may impact women's HIV risk perception. This study aims to describe Latina women's perception of their HIV risk within a relational, cultural, and linguistic context. DESIGN: Eight focus groups of Latina women (n = 28), four English speaking groups and four Spanish speaking groups, were conducted between December 2013 and May 2014...
October 21, 2016: Ethnicity & Health
Michael A Woodley Of Menie, Joseph A Schwartz, Kevin M Beaver
Utilizing a newly released cognitive Polygenic Score (PGS) from Wave IV of Add Health (n = 1,886), structural equation models (SEMs) examining the relationship between PGS and fertility (which is approximately 50% complete in the present sample), employing measures of verbal IQ and educational attainment as potential mediators, were estimated. The results of indirect pathway models revealed that verbal IQ mediates the positive relationship between PGS and educational attainment, and educational attainment in turn mediates the negative relationship between verbal IQ and a latent fertility measure...
October 20, 2016: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
Ewa Szwejser, B M Lidy Verburg-van Kemenade, Magdalena Maciuszek, Magdalena Chadzinska
Clinical and experimental evidence shows that estrogens affect immunity in mammals. Less is known about this interaction in the evolutionary older, non-mammalian, vertebrates. Fish form an excellent model to identify evolutionary conserved neuroendocrine-immune interactions: i) they are the earliest vertebrates with fully developed innate and adaptive immunity, ii) immune and endocrine parameters vary with season iii) physiology is constantly disrupted by increasing contamination of the aquatic environment...
October 16, 2016: Hormones and Behavior
Sophia L-Y Ling, David McD Taylor, Jeffery Robinson
OBJECTIVE: The aim of this study is to determine the period prevalence, nature and causes of workplace chemical and toxin exposures reported to the Victorian Poisons Information Centre (VPIC). PATIENTS AND METHODS: All cases classified as 'workplace: acute' when entered into the VPIC database (June 2005-December 2013) were analysed. Data were collected on patient sex, the nature of the chemical or toxin, route of exposure and season. RESULTS: Overall, 4928 cases were extracted...
October 18, 2016: European Journal of Emergency Medicine: Official Journal of the European Society for Emergency Medicine
Simone Vincenzi, Marc Mangel, Dusˇan Jesensˇek, John C Garza, Alain J Crivelli
Understanding the causes of within- and among-population differences in vital rates, life histories, and population dynamics is a central topic in ecology. To understand how within- and among-population variation emerges, we need long-term studies that include episodic events and contrasting environmental conditions, data to characterize individual and shared variation, and statistical models that can tease apart shared and individual contribution to the observed variation. We used long-term tag-recapture data to investigate and estimate within- and among-population differences in vital rates, life histories, and population dynamics of marble trout Salmo marmoratus, an endemic freshwater salmonid with a narrow range...
October 2016: Ecological Applications: a Publication of the Ecological Society of America
Alissa Davis, Beth E Meyerson, Blessing Aghaulor, Katherine Brown, Adisyn Watson, Kathryn E Muessig, Ligang Yang, Joseph D Tucker
BACKGROUND: Increased trade between China and Uganda has fueled trafficking of female Ugandans into China. These women may face challenges accessing health services. This study focused on examining barriers to health care access among female Ugandan sex workers in China. METHODS: In 2014, we undertook in-depth interviews with 19 female Ugandan sex workers in Guangzhou, China. Interviews focused on barriers to health service access and were analyzed using an a priori coding framework followed by open-coding to capture emergent themes...
October 14, 2016: International Journal for Equity in Health
Joshua P Moatt, Shinichi Nakagawa, Malgorzata Lagisz, Craig A Walling
BACKGROUND: Dietary restriction (DR), a reduction in the amount of food or particular nutrients eaten, is the most consistent environmental manipulation to extend lifespan and protect against age related diseases. Current evolutionary theory explains this effect as a shift in the resolution of the trade-off between lifespan and reproduction. However, recent studies have questioned the role of reproduction in mediating the effect of DR on longevity and no study has quantitatively investigated the effect of DR on reproduction across species...
October 7, 2016: BMC Evolutionary Biology
Hanna Koch, Lutz Becks
A species reproductive mode, along with its associated costs and benefits, can play a significant role in its evolution and survival. Facultative sexuality, being able to reproduce both sexually and asexually, has been deemed evolutionary favourable as the benefits of either mode may be fully realized. In fact, many studies have focused on identifying the benefits of sex and/or the forces selecting for increased rates of sex using facultative sexual species. The costs of either mode however can also have a profound impact on a population's evolutionary trajectory...
October 7, 2016: Journal of Evolutionary Biology
Brian Skinner
Same-sex sexual behaviour is ubiquitous in the animal kingdom, but its adaptive origins remain a prominent puzzle. Here, I suggest the possibility that same-sex sexual behaviour arises as a consequence of the competition between an evolutionary drive for a wide diversity in traits, which improves the adaptability of a population, and a drive for sexual dichotomization of traits, which promotes opposite-sex attraction and increases the rate of reproduction. This trade-off is explored via a simple mathematical 'toy model'...
September 2016: Royal Society Open Science
Yung Wa Sin, Chris Newman, Hannah L Dugdale, Christina Buesching, Maria-Elena Mannarelli, Geetha Annavi, Terry Burke, David W Macdonald
The innate immune system provides the primary vertebrate defence system against pathogen invasion, but it is energetically costly and can have immune pathological effects. A previous study in sticklebacks found that intermediate major histocompatibility complex (MHC) diversity correlated with a lower leukocyte coping capacity (LCC), compared to individuals with fewer, or many, MHC alleles. The organization of the MHC genes in mammals, however, differs to the highly duplicated MHC genes in sticklebacks by having far fewer loci...
2016: PloS One
Justine Klingelschmidt, Marie-Claire Parriault, Astrid Van Melle, Célia Basurko, Barbara Gontier, André Cabié, Bruno Hoen, Marie-Thérèse Sow, Mathieu Nacher
The French Antilles (Martinique, Saint Martin and Guadeloupe) and French Guiana are the French territories most affected by the HIV epidemic. Some population groups such as men who have sex with men (MSM), especially those involved in transactional sex, are thought to be particularly vulnerable to HIV but few data exist to help characterize their health-related needs and thus implement relevant prevention interventions. To fill this knowledge gap, we used data collected from an HIV/AIDS Knowledge, Attitudes, Behaviours and Practices survey conducted in 2012 among MSM living in the French Antilles and French Guiana and recruited through snowball sampling...
October 2, 2016: AIDS Care
Danielle B Garfinkel, Kamila A Alexander, Reagan McDonald-Mosley, Tiara C Willie, Michele R Decker
HIV pre-exposure prophylaxis (PrEP) presents new opportunities for HIV prevention. While women comprise approximately 20% of new HIV infections in the US, significant questions remain about how to most effectively facilitate PrEP uptake for this population. Family planning clinics are a dominant source of health care for young women and support an estimated 4.5 million women annually. We explore characteristics associated with HIV risk perception and PrEP acceptability among young adult women seeking reproductive health services in a high-prevalence setting...
September 29, 2016: AIDS Care
Sheina Koffler, Hiara Marques Meneses, Astrid de Matos Peixoto Kleinert, Rodolfo Jaffé
BACKGROUND: Reproductive success is determined by the interplay between mating and fertilization success. In social insect species with male-biased sex ratios and queen monogamy, males face particularly strong pre-copulatory sexual selection since they must compete with thousands of other males for a unique mating opportunity. Ejaculate quality is also expected to be under selection, because queens are long-lived and store sperm for life, so males with higher quality ejaculates are expected to provide queens with larger and longer-lived colonies, which in turn may produce more daughter queens (the only direct fitness gains of haplodiploid males)...
September 27, 2016: BMC Evolutionary Biology
David Lusseau, Phyllis C Lee
Despite the 1989 ivory trade ban, elephants continue to be killed to harvest their tusks for ivory. Since 2008, this poaching has increased to unprecedented levels driven by consumer demand for ivory products. CITES is now considering the development of a legal ivory trade [1, 2]. The proposal relies on three assumptions: (1) harvest regulation will cease all illegal activities, (2) defined sustainable quotas can be enforced, and (3) we can define meaningful sustainable quotas that come close to the current demand...
September 7, 2016: Current Biology: CB
D G Frade, S Nogueira, M J Santos, F I Cavaleiro
The reproductive strategy of Acanthochondria cornuta, a parasitic copepod with dwarf, hyperparasitic males, is described in detail. The potential impact of male parasitism on the reproductive output was evaluated by determining the size of each sex and the female's fecundity, egg size and total reproductive effort for each pair/trio throughout the four seasons of the year. Marked seasonal differences were observed in female size and reproductive output, suggesting two distinct generations, but no differences were observed for male size...
September 19, 2016: Parasitology
Iago Sanmartín-Villar, Adolfo Cordero-Rivera
Current research on female colour polymorphism in Ischnura damselflies suggests that a balanced fitness trade-off between morphotypes contributes to the maintenance of polymorphism inside populations. The genetic inheritance system constitutes a key factor to understand morph fluctuation and fitness. Ischnura genei, an endemic species of some Mediterranean islands, has three female colour morphs, including one androchrome (male-coloured) and two gynochromes. In this study, we reared two generations of I. genei under laboratory conditions and tested male behavioural responses to female colour morphs in the field...
2016: PeerJ
Yelena Bird, Mark Lemstra, Marla Rogers, John Moraros
The transmission and prevalence of Human Immunodeficiency Virus (HIV) among those employed as sex trade workers (STW) is a major public health concern. The present study describes the self-reported responses of 340 STW, at-risk for contracting HIV. The participants were recruited by selective targeting between 2009 and 2010 from within the Saskatoon Health Region (SHR), Saskatchewan, Canada. As of 2012, the SHR has the highest incidence rate of positive test reports for HIV in Canada, at more than three times the national average (17...
December 2016: SAHARA J: Journal of Social Aspects of HIV/AIDS Research Alliance
Nicola Wright, Athfah Akhtar, Graeme E Tosh, Andrew V Clifton
BACKGROUND: People with serious mental illness have rates of Human Immuno-deficiency Virus (HIV) infection higher than expected in the general population for the same demographic area. Despite this elevated prevalence, UK national strategies around sexual health and HIV prevention do not state that people with serious mental illness are a high risk group. However, a significant proportion in this group are sexually active and engage in HIV-risk behaviours including having multiple sexual partners, infrequent use of condoms and trading sex for money or drugs...
September 9, 2016: Cochrane Database of Systematic Reviews
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