Generating Probabilistic Spatially-Explicit Individual and Population Exposure Estimates for Ecological Risk Assessments

Exposure to chemical contaminants in various media must be estimated when performing ecological risk assessments. Exposure estimates are often based on the 95th-percentile upper confidence limit on the mean concentration of all samples, calculated without regard to critical ecological and spatial information about the relative relationship of receptors, their habitats, and contaminants. This practice produces exposure estimates that are potentially unrepresentative of the ecology of the receptor. This article proposes a habitat area and quality-conditioned exposure estimator, E[HQ], that requires consideration of these relationships. It describes a spatially explicit ecological exposure model to facilitate calculation of E[HQ]. The model provides (1) a flexible platform for investigating the effect of changes in habitat area, habitat quality, foraging area, and population size on exposure estimates, and (2) a tool for calculating E[HQ] for use in actual risk assessments. The inner loop of a Visual Basic program randomly walks a receptor over a multicelled landscape--each cell of which contains values for cell area, habitat area, habitat quality, and concentration--accumulating an exposure estimate until the total area foraged is less than or equal to a given foraging area. An outer loop then steps through foraging areas of increasing size. This program is iterated by Monte Carlo software, with the number of iterations representing the population size. Results indicate that (1) any single estimator may over- or underestimate exposure, depending on foraging strategy and spatial relationships of habitat and contamination, and (2) changes in exposure estimates in response to changes in foraging and habitat area are not linear.     

The Severely-Distressed African American Family in the Crack Era: Empowerment is not Enough

Numerous African American families have struggled for generations with persistent poverty, especially in the inner city. These conditions were further strained during the 1980s and 1990s by the widespread use of crack cocaine. For many, crack use became an obsession, dominated their lives, and superseded family responsibilities. This behavior placed additional pressure on already stressed kin support networks. This paper explores the processes prevailing in two households during this period. In the 2000s, children born to members of the Crack Generation are avoiding use of crack but face major deficits from their difficult childhoods. This presents both challenges and opportunities. The discussion considers initiatives from both a social problems and a strengths perspective that could help these families and help these families help themselves to advance their economic circumstances.     

Unquestioned Answers or Unanswered Questions: Beliefs About Science Guide Responses to Uncertainty in Climate Change Risk Communication

In two experimental studies we investigated the effect of beliefs about the nature and purpose of science (classical vs. Kuhnian models of science) on responses to uncertainty in scientific messages about climate change risk. The results revealed a significant interaction between both measured (Study 1) and manipulated (Study 2) beliefs about science and the level of communicated uncertainty on willingness to act in line with the message. Specifically, messages that communicated high uncertainty were more persuasive for participants who shared an understanding of science as debate than for those who believed that science is a search for absolute truth. In addition, participants who had a concept of science as debate were more motivated by higher (rather than lower) uncertainty in climate change messages. The results suggest that achieving alignment between the general public's beliefs about science and the style of the scientific messages is crucial for successful risk communication in science. Accordingly, rather than uncertainty always undermining the effectiveness of science communication, uncertainty can enhance message effects when it fits the audience's understanding of what science is.     

How is ‘racism’ understood in literature about black and minority ethnic social work students in Britain? A conceptual review

ABSTRACT

This conceptual review interrogates a body of literature concerned with black and minority ethnic (BME) social work students in Britain since 2008. This period has coincided with an increasing focus on diversity in Higher Education, but also lower prominence being given to race in social work. In social work education, there has been increased attention to the needs and experiences of BME students. While most of this literature acknowledges racism, what constitutes racism and how it can be understood usually remain implicit. This review aimed to explore influential concepts in the literature and the ways these affected how racism is understood and identified. A search was carried out for articles in peer-reviewed academic journals between 2008 and 2018. In this article, we discuss four recurring concepts of racism in this literature: subtle racism, institutional racism, cultural difference and pedagogical solutions. The article analyses the assumptions underpinning these concepts, and the implications for how racism has been understood and investigated in this literature. The subsequent discussion calls for a more reflexive approach and identifies questions that future research could explore, which could lead to improved understandings of racism in social work education.     

Sadness and Chronic Illness: A Conversation with Bruce Perham

Bruce Perham is a social worker and narrative therapist who works at Alzheimers Australia Vic., the peak body representing the interests of people affected by dementia. He previously worked at an adoption agency, the Spastic Society (now Scope), and the Multiple Sclerosis Society. Bruce trained in family therapy in Melbourne and in narrative therapy with Michael White at the Dulwich Centre. Bruce has created an extensive range of written and video resources for people with dementia and MS and their family members. He describes how his family of origin, his resultant personal struggles as an adult, and narrative therapy, have profoundly influenced his work with people with chronic illness and their families, in particular, his approach to sadness.