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At least 109 records · Page 6Linked to original sources
PubMed2005

Sperm competition and male ejaculate investment in Nauphoeta cinerea: effects of social environment during development.

Selective pressure arising from sperm competition has been predicted to influence evolutionary and behavioural adjustment of ejaculate investment, but also may influence developmental adjustment of ejaculate investment. Immature males able to target resources strategically based on the competitive environment they will experience when they become sexually mature should be at a selective advantage. In our study we investigated how the presence of potential competitors or mates affects ejaculate and testes investment during development in the cockroach Nauphoeta cinerea, a species where males control female remating via their ejaculate size (large spermatophores prevent females from remating and therefore function to avoid sperm competition for males) and females store sperm. Our aim was to determine whether the social environment influences developmental adjustment of ejaculate investment and the relative importance of ejaculate components with different functions; avoidance of or engagement in sperm competition. We conclude that the social environment can influence developmental and behavioural flexibility in specific ejaculate components that may function to avoid or engage in sperm competition.

Analysis of Variance↗
PubMedDate not supplied

Social environment and smoking initiation.

This paper reports exploratory research to predict smoking initiation prospectively as a function of both personal (peer and family) and more macro (school and community) social environment. At the macro level, older peer smoking by school system and school board by school system were significant predictors of smoking onset. At the personal level, the effect of gender varied with time. Males began to smoke earlier than females, but females had higher onset rates in the period from the end of Grade 7 to the end of Grade 9. Significant sibling and peer influences replicate the consistent findings in the smoking initiation area. Implications for the longitudinal study of the smoking onset process are given.

Adolescent↗
PubMedDate not supplied

Marital status and birthrate of deaf people in two Swedish counties: the impact of social environment in terms of deaf community.

Deafness affects many social interactions. The impact of deafness depends on several factors, e.g., the type of social environment in terms of the particular Deaf community a person lives in. The authors recorded the birthrate and the proportions of married and divorced people among deaf people in two Swedish counties: Narke, which had a strong Deaf community, and Varmland, whose Deaf community was weak. In both counties, the authors found that deafness was associated with low marriage rates and low birthrates. Further, in Narke, 99% of the people in the sample were married to another deaf person; only 10% were in Varmland. In Narke, the divorce rate among deaf people was about the same as that of the reference population (i.e., the county's marriage-age population). In Varmland, deaf people had a relatively low divorce rate. The findings are discussed from medical and social perspectives.

Adult↗
PubMed1996

Impact of the social environment on blood pressure in women.

A remarkable increase in life expectancy, a decrease in fertility and delayed first birth as well as increased literacy have all contributed to major changes in women's lifestyles and their social environment. Several factors such as level of education, unemployment and low income have been associated in epidemiological studies with elevations in blood pressure. Social support appears to be an important buffer modulating the cardiovascular effects of a variety of stressors. Studies to date suggest that there may be important gender differences in the way socioenvironmental factors affect blood pressure, thus warranting development of intervention strategies directed uniquely at women.

Female↗
PubMed1995

Effect of staff turnover and the social environment on depressive symptoms in nursing home residents.

Although one would expect a relationship on the basis of anecdotal evidence, there is little objective evidence for a hypothesized relationship between the social environment provided in institutional settings and the psychological well-being of the residents. In an attempt to operationalize this hypothesis, the present study examined the effect of nursing staff turnover, frequency of visitors, and the presence or absence of close friends on depressive symptoms among nursing home residents. Once physical dependency and past history of depression were taken into account, there was no demonstrable relationship between staff turnover and depressive symptoms among the residents of this sample of nursing homes. There was, however, a significant relationship between absence of close friends among other residents and depressive symptoms, although only 13% of the total variance was explained.

Activities of Daily Living↗
PubMed2005

The social environment affects mate guarding behavior in Japanese beetles, Popillia japonica.

The effect of the social environment on post-copulatory mate guarding duration in Japanese beetles, (Popillia japonica Newman), was examined in a laboratory experiment. The mate guarding durations of beetles in different sex ratios and densities were observed for 10 hours. Guarding duration was longer when females were larger, suggesting the presence of 'cryptic' male mate choice. Densities, but not sex ratio, affected the duration of guarding bouts, with males guarding for longer at higher densities. This result implies that males increase their guarding duration under conditions in which their female may be likely to be encountered by other males. The lack of a sex ratio effect on the duration of guarding bouts is consistent with other studies on this species that indicate males have difficulty distinguishing females from males. Consequently, because the sex ratio on food plants is typically male-biased, a paired male may react just to density, treating surrounding individuals as if they were mostly males. The total amount of time males spent guarding was lower at lower densities and at male-biased sex ratios; this suggests that after ceasing to guard one female, males were less able to find a subsequent mate under these conditions.

Animals↗
PubMed2001

Reproductive biology of captive male cottontop tamarin monkeys as a function of social environment.

The cottontop tamarin, Saguinus oedipus oedipus, is a cooperatively breeding monkey in which mature male and female offspring serve as helpers to assist in rearing younger siblings. Generally, only one female per social group reproduces; breeding restriction is mediated in postpubertal female offspring through low and acyclic levels of reproductive hormones. We investigated (1) reproductive activity of postpubertal male offspring, and (2) whether aggression towards male offspring and a cortisol-mediated stress response might restrict breeding of male offspring in the natal group. We examined sexual behaviour, olfactory communication and urinary hormone levels (testosterone, dihydrotestosterone, luteinizing hormone, cortisol) of the subject males while we manipulated their social environment from housing in natal groups to pairing with a novel female, and after the production of their own offspring. Mounting and erection rates of the male subjects were as high in the natal group as when paired with a novel female. However, most mounts in the natal group were directed towards other males, and complete copulation sequences did not occur with natal-group females. Social environment had no significant effect on olfactory investigation of breeding females. Although hormone levels increased significantly after the subjects were removed from the natal group, the elevation was transient; the hormone levels of subjects in their natal groups did not differ from the levels shown by the same males when successfully producing their own offspring. Male offspring received more contact aggression in the natal group than when paired with the novel female. However, most of the aggression was received from siblings rather than the breeding pair, and levels of cortisol did not correspond with levels of aggression. Thus, at both a behavioural and endocrine level, mature male offspring in captive natal groups were potentially fertile, but sexual activity with natal-group females appeared to be behaviourally restricted and directed instead towards group males. In wild cottontop tamarin groups, this reproductive potential may allow male helpers flexibility to respond to breeding opportunities. Copyright 2001 The Association for the Study of Animal Behaviour.

Journal Article↗
PubMed1992

The high-risk infant environment. Part 2. The role of caregiving and the social environment.

Neonatal intensive care units are essential for the successful care of very immature and sick infants. The technology of NICUs has contributed significantly to the reduction of neonatal mortality and improvement of neonatal outcome. While the outcome for high-risk neonates has vastly improved over the past three decades, a number of infants sustain injuries and complications that result in long-term disabilities. It is now clear that some of the long-term problems of high-risk infants are a result of the environment and care practices and are not attributable to the original disease or condition that necessitated intensive care. There is accumulating evidence that environmental factors and care practices can interact with disease processes in ways that can increase morbidity, and possibly mortality. In addition to developmental and behavioral problems, there is growing evidence of effects on visual function and perhaps other sensory systems. Many of the environmental and care factors may cause delay in recovery and increase NICU time or unnecessary discomfort, yet not produce long-term disabilities or problems, as currently assessed. Many of the potential behavioral and developmental problems, as well as many of the potential problems with visual, auditory, and other modes of sensory discrimination, are not included in the usual follow-up assessments. The absence of data or the limitations of existing studies are not a cause for comfort or the assumption that the environment and care practices are safe or not harmful.(ABSTRACT TRUNCATED AT 250 WORDS)

Environment↗
PubMed2004

Social environment modulates photoperiodic immune and reproductive responses in adult male white-footed mice (Peromyscus leucopus).

Social cues may interact with photoperiod to regulate seasonal adaptations in photoperiod-responsive rodents. Specifically, photoperiod-induced adjustments (e.g., reproduction and immune function) may differ among individuals in heterosexual pairs, same-sex pairs, or isolation. Heterosexual cues may be more influential, based on their potential fitness value, than same-sex cues or no social cues. The present study examined the effects of pair (with a male or female) or individual housing on reproductive and immune responses in male white-footed mice (Peromyscus leucopus) maintained in long or short photoperiods. Female pairing did not affect reproductive responses in short-day males. In long days, however, the presence of a female increased both testosterone concentrations and testes mass compared with individually housed and male-paired mice, respectively. Short-day, individually housed males enhanced delayed-type hypersensitivity (DTH) responses compared with single-housed mice in long days, but all paired groups decreased DTH responses regardless of photoperiod. The lack of enhanced DTH response in male mice paired with females coincided with reduced circulating corticosterone concentrations in both photoperiod treatments. Together, these results suggest that social environment may have important modulatory effects on photoperiod-regulated immune responses in male white-footed mice.

Animals↗
PubMed2003

Arginine vasotocin interacts with the social environment to regulate advertisement calling in the gray treefrog (Hyla versicolor).

Arginine vasotocin (AVT) has different effects on social behaviors across species with different social systems. However, less attention has been directed towards the way environmental stimuli interact with AVT to affect social behaviors. Previous work found that AVT affects the production of advertisement calls and the outcome of competitive interactions between male gray treefrogs (Hula versicolor). We conducted a field study to investigate how the presence of other males in a chorus influenced the production of advertisement calls in males treated with AVT or saline. After hormone treatment we placed individuals in call sites either within 50 cm of another calling male (proximate), or more than 2 m away from any calling male (distant). Males treated with AVT produced significantly longer calls with more pulses when placed at proximate call sites, but not distant call sites. Nonsignificant trends indicated that these increases in call length coincided with a decrease in call rate. There was no effect of call site distance on advertisement calls when males were treated with saline. These results indicate that the social environment can modulate the action of AVT on an important reproductive behavior, and that AVT does not influence call duration and pulse number unless another male is nearby. Understanding how social stimuli regulate the action of AVT on behavior could provide insight on the diversity of AVT function across species.

Animals↗
PubMed2002

The effects of social environment on adult neurogenesis in the female prairie vole.

In the mammalian brain, adult neurogenesis has been found to occur primarily in the subventricular zone (SVZ) and dentate gyrus of the hippocampus (DG) and to be influenced by both exogenous and endogenous factors. In the present study, we examined the effects of male exposure or social isolation on neurogenesis in adult female prairie voles (Microtus ochrogaster). Newly proliferated cells labeled by a cell proliferation marker, 5-bromo-2'-deoxyuridine (BrdU), were found in the SVZ and DG, as well as in other brain areas, such as the amygdala, hypothalamus, neocortex, and caudate/putamen. Two days of male exposure significantly increased the number of BrdU-labeled cells in the amygdala and hypothalamus in comparison to social isolation. Three weeks later, group differences in BrdU labeling generally persisted in the amygdala, whereas in the hypothalamus, the male-exposed animals had more BrdU-labeled cells than did the female-exposed animals. In the SVZ, 2 days of social isolation increased the number of BrdU-labeled cells compared to female exposure, but this difference was no longer present 3 weeks later. We have also found that the vast majority of the BrdU-labeled cells contained a neuronal marker, indicating neuronal phenotypes. Finally, group differences in the number of cells undergoing apoptosis were subtle and did not seem to account for the observed differences in BrdU labeling. Together, our data indicate that social environment affects neuron proliferation in a stimulus- and site-specific manner in adult female prairie voles.

Aging↗
PubMed2001

The importance of the social environment for physically active lifestyle--results from an international study.

Physically active lifestyles are regularly associated with improved health and quality of life. Differences in lifestyles in society can partly be understood through the differences in the social and physical environment. This study examines the relationships between reported physical activity, and the extent of perceived support for physical activity in the physical and policy environment (e.g. facilities, programmes and other opportunities), and in the social environment. The data for the study come from a cross-cultural health policy study called MAREPS. In total, 3342 adults, 18 years or older, from six countries (Belgium, Finland, Germany, The Netherlands, Spain, Switzerland) were interviewed via telephone. Respondents were categorised as active or inactive according to self-reported physical activity. Social environmental factors and physical and policy environmental factors were also assessed. The analysis of the data was informed by social cognitive theory, although the study was not originally designed for this purpose. Sixty-eight percent of females and 70% of males were active. The proportions of active and inactive varied by countries to a great extent. The strongest independent predictor of being physically active was social environment. Those who perceived low social support from their personal environment (i.e. family, friends, school and workplace) were more than twice as likely to be sedentary compared to those who reported high social support from their personal environment. Specific knowledge of the programmes and actions for physical activity and sport was also a strong predictor of being active. A supportive physical and policy environment was not associated with participation in physical activity as strongly as had been anticipated. The variation between countries was stronger predictor of being active than the physical and policy environment variables. This study generates the hypotheses and raises the questions that in a preliminary way, there appears to be some relationships between aspects of physical and social environment and physical activity participation. However, future research is needed to refine and clarify this.

Adolescent↗
PubMed1998

The social environment and health in rheumatoid arthritis: marital quality predicts individual variability in pain severity.

OBJECTIVE: To examine prospective relations between a wide array of measures of social functioning and pain, while controlling for disease duration and activity and functional grade. METHODS: As part of a larger study on health care utilization, longitudinal data were collected from 136 Dutch and 98 German outpatients on clinical status and pain. Social data included information on sexual handicap, spouse behavior, loneliness, daily emotional support, and the maintenance of pleasurable life domains. Pain severity was assessed at baseline and 12 months later with standard measures of pain and analyzed with hierarchical regressions. RESULTS: Social measures obtained at baseline were consistently associated with pain at followup. Depression was a moderate correlate of pain in the Dutch and German samples. The regressions revealed that patient reports of negative spouse behavior (such as avoidance and critical remarks) and baseline depression predicted worse pain outcome, and this association remained significant in analyses controlling for baseline pain. The level of formal education was a weak correlate of disability, emotional support, and pain. Daily emotional support and social life domains associated with positive affect had an indirect influence on outcome. The absence of strong rather than weak social ties was the component of the loneliness construct linked to pain. These associations between social prognostic factors and pain severity, however, were mediated by psychological functioning at baseline. CONCLUSION: The social environment was found to operate on the core health outcome, pain severity, via several pathways. Social functioning may be affected by rheumatoid arthritis (RA) progression, but it also appears to form a determinant of future health outcome. Not only the status of being married but also the quality of the relationship in terms of long-term stress and emotional support may be useful prognostic factors in RA.

Activities of Daily Living↗
PubMed2000

Women's work and fertility in a sub-Saharan urban setting: a social environment approach.

Data from three separate studies conducted in Maputo, Mozambique, in 1993 are used to analyse the relationship between the type of social environment in which women work and their fertility and contraceptive use. The analysis finds that women who work in more collectivized environments have fewer children and are more likely to use modern contraception than women who work in more individualized milieus and those who do not work outside the home. Most of these differences persist in multivariate tests. It is argued that collectivized work environments are most conducive to diffusion and legitimation of reproductive innovations. In contrast, individualized environments tend to isolate women and therefore may retard their acceptance of innovative fertility-related behaviour.

Adult↗
PubMed1994

Personality, social environment, and past behavior as predictors of late adolescent alcohol use.

Personality, as measured by subscales of the Sensation Seeking Scale (Zuckerman, 1979), social environmental exposure to alcohol use measured by parental and peer alcohol use, and past alcohol use were examined as predictors of late adolescent alcohol use in a sample of 575 1st-year college students. Efficacious predictors, in order of importance, include peer alcohol use, disinhibition, and age of first intoxication. The results support the relative importance of peer networks over parental models in determining late adolescent alcohol use. Our combinatorial model of personality, social environment, and past behavior is one such model in a growing trend toward the use of interactional models for predicting behavior.

Adolescent↗
PubMed1977

Behavioral and neurological comparisons of neonates born to mothers of differing social environments.

Sixty newborn infants, 30 born to parents of middle to upper-middle socioeconomic status and 30 born to parents of limited personal-social resources, were assessed on the Neonatal Behavioral Assessment Scale. Although no difference between groups was found in motor and neurological status, data from this study did indicate that the prenatal factors, having no obvious physiological base, associated with the parental social environment, may affect the newborn's behavioral outcome.

Child Behavior↗
PubMed1986

Effects of social environment on sexual maturation in female cotton rats (Sigmodon hispidus).

Age at sexual maturation among female cotton rats was measured in a variety of intraspecific social environments. Two experiments were conducted. In Experiment I, female cotton rats attained vaginal perforation and first estrus at younger ages and lighter body masses when paired from weaning with a conspecific juvenile male than when caged alone. In Experiment II, these findings were replicated and extended. Females housed with juvenile males matured at the youngest ages, while those housed alone matured at the oldest ages. Females housed with adult males matured at intermediate ages. Presence of a second juvenile female during maturation was significantly associated with early vaginal opening but not with early first estrus. The results of this study are discussed in context of similar social environmental effects on female sexual maturation that have been identified in other rodent species.

Animals↗