Moving from Pattern to Process: Coexistence Mechanisms Under Intermediate Disturbance Regimes

Coexistence mechanisms that require environmental variation to operate contribute importantly to the maintenance of biodiversity. One famous hypothesis of diversity maintenance under disturbance is the intermediate disturbance hypothesis (IDH). The IDH proposes patterns of peaked diversity under intermediate disturbance regimes, based on a tension between competitively superior species and species which can rapidly colonize following disturbance. We review the literature, and describe recent research that suggests that more than one underlying mechanism can generate this unimodal diversity pattern in disturbed environments. Several exciting emerging research areas are identified, including interactions between disturbance types, operation of the IDH in multi-trophic systems, and changes in disturbance regimes. However, empirical work is still focussed on describing the IDH pattern, with little emphasis on identifying its mechanistic basis. We discuss how to extend methods for identifying different coexistence mechanisms, developed in the theoretical literature, to experimental research. In an attempt to operationalize these various ideas we outline a hypothetical IDH research programme. A solid understanding of the life history attributes of the component species and their responses to disturbance will facilitate identification of the coexistence mechanism(s) underlying the IDH pattern, and provide a framework by which empirical and theoretical results can be more fully integrated

Moving from Pattern to Process: Coexistence Mechanisms Under Intermediate Disturbance Regimes

Coexistence mechanisms that require environmental variation to operate contribute importantly to the maintenance of biodiversity. One famous hypothesis of diversity maintenance under disturbance is the intermediate disturbance hypothesis (IDH). The IDH proposes patterns of peaked diversity under intermediate disturbance regimes, based on a tension between competitively superior species and species which can rapidly colonize following disturbance. We review the literature, and describe recent research that suggests that more than one underlying mechanism can generate this unimodal diversity pattern in disturbed environments. Several exciting emerging research areas are identified, including interactions between disturbance types, operation of the IDH in multi-trophic systems, and changes in disturbance regimes. However, empirical work is still focussed on describing the IDH pattern, with little emphasis on identifying its mechanistic basis. We discuss how to extend methods for identifying different coexistence mechanisms, developed in the theoretical literature, to experimental research. In an attempt to operationalize these various ideas we outline a hypothetical IDH research programme. A solid understanding of the life history attributes of the component species and their responses to disturbance will facilitate identification of the coexistence mechanism(s) underlying the IDH pattern, and provide a framework by which empirical and theoretical results can be more fully integrated

Experiences of Mental Health Care Among Women Treated for Postpartum Psychosis in England: A Qualitative Study

Postpartum psychosis has been found to affect 0.89-2.6 per 1000 women. Onset is typically rapid and severe. Early recognition and appropriate treatment are crucial for a good prognosis. Our aim in this study was to understand women's experiences of mental health care and services for psychosis in the postnatal period. Semi-structured interviews were conducted with 12 women who reported being treated for postpartum psychosis. Findings were analysed thematically. Women reported that healthcare professionals across maternity and mental health services often lacked awareness and knowledge of postpartum psychosis and did not always keep them or their partners/families informed, supported, and involved. Women wanted better collaboration between and within services, and more efficient, appropriate, and timely care. They valued inpatient services that could meet their needs, favouring Mother and Baby Units over general psychiatric wards. Early Intervention in Psychosis services and specialist perinatal community mental health teams were also well liked

How Design Features in Digital Math Games Support Learning and Mathematics Connections

Current research shows that digital games can significantly enhance children’s learning. The purpose of this study was to examine how design features in 12 digital math games influenced children’s learning. The participants in this study were 193 children in Grades 2 through 6 (ages 8-12). During clinical interviews, children in the study completed pre-tests, interacted with digital math games, responded to questions about the digital math games, and completed post-tests. We recorded the interactions using two video perspectives that recorded children’s gameplay and responses to interviewers. We employed mixed methods to analyze the data and identify salient patterns in children’s experiences with the digital math games. The analysis revealed significant gains for 9 of the 12 digital games and most children were aware of the design features in the games. There were eight prominent categories of design features in the video data that supported learning and mathematics connections. Six categories focused on how the design features supported learning in the digital games. These categories included: accuracy feedback, unlimited/multiple attempts, information tutorials and hints, focused constraint, progressive levels, and game efficiency. Two categories were more specific to embodied cognition and action with the mathematics, and focused on how design features promoted mathematics connections. These categories included: linked representations and linked physical actions. The digital games in this study that did not include linked representations and opportunities for linked physical actions as design features did not produce significant gains. These results suggest the key role of mathematics-specific design features in the design of digital math games

Moving from pattern to process: Coexistence mechanisms under intermediate disturbance regimes

Coexistence mechanisms that require environmental variation to operate contribute importantly to the maintenance of biodiversity. One famous hypothesis of diversity maintenance under disturbance is the intermediate disturbance hypothesis (IDH). The IDH proposes patterns of peaked diversity under intermediate disturbance regimes, based on a tension between competitively superior species and species which can rapidly colonize following disturbance. We review the literature, and describe recent research that suggests that more than one underlying mechanism can generate this unimodal diversity pattern in disturbed environments. Several exciting emerging research areas are identified, including interactions between disturbance types, operation of the IDH in multi-trophic systems, and changes in disturbance regimes. However, empirical work is still focussed on describing the IDH pattern, with little emphasis on identifying its mechanistic basis. We discuss how to extend methods for identifying different coexistence mechanisms, developed in the theoretical literature, to experimental research. In an attempt to operationalize these various ideas we outline a hypothetical IDH research programme. A solid understanding of the life history attributes of the component species and their responses to disturbance will facilitate identification of the coexistence mechanism(s) underlying the IDH pattern, and provide a framework by which empirical and theoretical results can be more fully integrated

Mental health among older married couples: the role of gender and family life.

PURPOSE: As shared family context may be an important influence on mental health, and gender differences in mental health, in later life we investigated how gender, family-related variables and gender roles were associated with mental health in older married couples. METHODS: Using data on a sample of 2,511 married couples born between 1923 and 1953 (drawn from the British Household Panel Survey) we analysed differences in the mental health of husbands and wives by fertility history, length of marriage, presence of co-resident children, reported social support, hours of household work, attitudes to gender roles and health of husband and wife. Mental health in 2001 was measured using the General Health Questionnaire (GHQ-12). Multilevel modelling was used to assess effects in husbands and wives and variations between husbands and wives. RESULTS: Results showed that although the mental health of married couples was correlated, wives had poorer mental health than their husbands. The gender difference was smaller in couples who lived with a child aged 16 or more (and had no younger co-resident children) and in couples in which both spouses had experienced early parenthood. The influence of individual and family characteristics on mental health also differed between husbands and wives. For husbands, early fatherhood and co-residence with a child or children aged 16 or more increased the odds of poor mental health. For wives, having had a child when aged 35 or more appeared protective while having traditional gender role attitudes increased the odds of poorer mental health. CONCLUSIONS: The role of family characteristics in the shared marital context has complex associations with mental health, some of which seem gender specific. Although wives express more mental distress, husbands in general show poorer mental health related to family characteristics