Watershed-scale analysis of pollutant distributions in stormwater management ponds

Stormwater management ponds have become a common Best Management Practice in urban and suburban landscapes. Stormwater management ponds are designed to hold runoff from impervious surfaces and allow the settling of sediments and associated pollutants. Various semi-aquatic and aquatic wildlife species have been documented using stormwater management ponds as habitat, but these wetland-like systems are not managed to adhere to freshwater habitat pollutant guidelines. To address the potential for pollutant exposure for wildlife, we used a random sample of 68 stormwater ponds and estimated the proportion of ponds in a third-order watershed that exceed toxicity guidelines for trace metals and polycyclic aromatic hydrocarbons in sediments and chloride in surface waters. Ninety-six percent of ponds exceeded consensus-based threshold effect concentrations for at least one trace metal. Concentrations of at least one of the PAHs measured exceeded the threshold effects concentration in 63% of the ponds. Nine percent of ponds exceeded chronic toxicity levels of chloride on all sampling dates, and 21% exceeded acute toxicity concentrations on at least one sampling date. More studies are needed to evaluate toxic effects of pollutants in stormwater management ponds and the potential for interactive effects of pollutants on wildlife.     

Childhood mortality,family size and birth order in pre-industrial Europe

Demography - Based on parish registers, demographic histories of Crulai (France), Tourouvre-au-Perche (France), and Geneva (Switzerland) established the childhood mortality experienced by complete...     

Self-concept and contraception: Pre-conception decision-making

This paper deals with the extent to which two dimensions of self-concept, perceived competence and attitudes toward the female role, are a factor in pre-conception decision-making on contraceptive usage among women who have unwanted conceptions. The study was done throughout Michigan in 1974–75. The sample was 1746 women with unwanted conceptions, selected by means of a two-stage stratified sampling design. A standardized questionnaire included items on demographics, birth control use, and pregnancy resolution, as well as a feminism scale and a scale to measure perceived competence. Several multiple regression analyses were carried out. A hypothesis that contraceptive usage would be positively associated with perceived competence and negatively associated with traditional attitudes toward the female role was strongly supported. In an analysis of various subgroups, differing in age, race, and marital status, self-concept variables were significant predictors only among unmarried adults, regardless of race. Other important predictors of contraceptive usage among the subgroups were father's educational level, number of children raised by respondent, having a regular physician, and frequency of church attendance. For this sample, self-concept variables generally were better predictors of the pre-conception decision-making than of the post-conception decision.This research was supported by Grant #HD07739, NICHD. The authors are affiliated with Wayne State University.     

“Harder and Harder”? Is Mainstream Pornography Becoming Increasingly Violent and Do Viewers Prefer Violent Content?

It is a common notion among many scholars and pundits that the pornography industry becomes “harder and harder” with every passing year. Some have suggested that porn viewers, who are mostly men, become desensitized to “soft” pornography, and producers are happy to generate videos that are more hard core, resulting in a growing demand for and supply of violent and degrading acts against women in mainstream pornographic videos. We examined this accepted wisdom by utilizing a sample of 269 popular videos uploaded to PornHub over the past decade. More specifically, we tested two related claims: (1) aggressive content in videos is on the rise and (2) viewers prefer such content, reflected in both the number of views and the rankings for videos containing aggression. Our results offer no support for these contentions. First, we did not find any consistent uptick in aggressive content over the past decade; in fact, the average video today contains shorter segments showing aggression. Second, videos containing aggressive acts are both less likely to receive views and less likely to be ranked favorably by viewers, who prefer videos where women clearly perform pleasure.     

Memorable encounters: Ideology,information acquisition,and television news

Many consumers of television news perceive the ideological position held by certain networks as being either consonant with, or dissonant from, their own political beliefs. This raises the question of how the perceived consonance or dissonance of media sources influences the viewer's ability to acquire and recall information. It is possible that being exposed to a consonant media source could lead an individual to pay more attention, whereas the individual would be more inclined to dismiss a dissonant media source. In contrast, however, it is also possible that an individual may pay extra attention to the dissonant media source because it presents a perspective that differs from the one that individual currently holds. Utilizing an experimental research design, I am able to demonstrate that individuals are better able to acquire and recall information presented to them by a media source that they perceive to be ideologically dissonant from their own political position.