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61.
62.
Summary Experiments were conducted to determine if slug density, or food quantity and quality could cause dispersal by slugs.Arion ater dispersed quickly from overcrowded areas, where high mortality was incurred by this species. Poor food conditions, caused
more dispersal than good food conditions, but food had no effect on the mortality ofA. ater. Neither food nor density factors had significant effects on the dispersal ofAriolimax columbianus. However, moreA. columbianus died in the high- than low-density treatments.A. columbianus mortality was unaffected by the food factor. DispersingArion were heavier than non-dispersers, but there was no difference between the weights of dispersing and non-dispersingAriolimax. There were significant seasonal changes in the dispersal rate, mortality and weight of dispersingArion, whereas only the mortality ofAriolimax changed significantly during the experiments.
SinceArion ater did not markedly reduce its activity during unsuitable weather it was able to leave areas of poor food and high slug density
fairly rapidly.Ariolimax columbianus' large size allowed it to remain inactive during unfavourable weather and permitted this species to be relatively unresponsive
to the experimental treatments. 相似文献
63.
Objective. Economic theory suggests that competition reduces employers' latitude to engage in wage discrimination ( Becker, 1957 ). This study investigates the impact of foreign and domestic competition on wage discrimination. Method. Utilizing the sample of males in U.S. manufacturing industries from the 1990 Public Use Micro Sample (PUMS), industry wage equations are estimated. In a second stage, the impact of domestic and foreign competition on racial wage disparity is assessed. Results. We find little evidence to support our hypothesis. Conclusions. Notwithstanding, the failure of conventional economic theory to satisfactorily explain racial wage disparity reiterates the need to incorporate alternative theories of discrimination into mainstream economic theory. 相似文献
64.
This paper examines an aspect of social inequality experienced by Aboriginal people living in a remote Queensland mining town. We contend that non-Aboriginal perceptions and attitudes of Aboriginal drinking behaviour contribute directly to structural inequalities within the Mount Isa community. Social drinking in the township is, for reserve-dwelling Aborigines, restricted mainly to one bar in one hotel and adjoining park and river bank area. The restrictions are preserved through both overt and covert discrimination. Aboriginal inebriation and excessive drinking are therefore more visible to the wider community and more accessible to police prosecution than that of any other ethnic group in the town. Although White folk tales concerning Aboriginal drinking often contain fear about acts of violence and crime directed towards the White community, soundly documented incidents are rare. This paper argues that the persistence of such attitudes is at the heart of a symbolic differential between the White and Black community in Queensland. Moreover, problems within the Aboriginal community that can be directly related to the excessive consumption of alcohol must also be seen as a product of these White reactions and perceptions. 相似文献
65.
J. Hamilton Stewart 《Journal of Labor Research》2006,27(4):443-472
Employer “neutrality” and union recognition by “card check” are tools unions use to bolster their shrinking numbers. Employee
freeinformed choice and the sanctity of a democratic, secretballot National Labor Relations Board (NLRB) election are the
casualties of this fast-track approach to organizing. The NLRB is faced with challenging issues about some of the agreements
which may overreach legal boundaries. This paper addresses those issues and highlights pending NLRB cases which may resolve
some of them. 相似文献
66.
In this paper results are reported for a series of counterfactual experiments with an eight- region numerical general equilibrium model of world trade, production, and welfare. In these analyses trade restrictions in the developing world are modeled as quantity constrained import licensing, which generates competitive rent-seeking behavior. Model experiments concentrate on the implications of differential factor endowment growth for the North-South terms of trade, and the effects of alternative trade policy changes in developing countries. 相似文献
67.
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69.
This study examined predictors of attrition from a clinical trial examining the effects of an expressive writing intervention for sexual problems among female survivors of child sexual abuse. Participants were 124 women all reporting sexual difficulties, who were randomized to a trauma-focused condition (n?=?45), an experimental sexual schema-focused condition (n?=?37), or a control condition (n?=?42). Thirty-five women (28%) dropped out before completing posttreatment assessments. Younger age, less education, and increased use of positive coping strategies were each independently associated with dropout. Results have implications for both researchers and clinicians working with this population, and it is hoped that these data can help bolster retention of those who are more likely to discontinue treatment. 相似文献
70.
Cynthia S. Hamilton 《Slavery & abolition》2013,34(4):631-652
The image of the kneeling slave, designed for the seal of the Society for Effecting the Abolition of the Slave Trade, then widely distributed as a cameo manufactured and distributed by Josiah Wedgwood became a powerful abolitionist icon. The image has been seen as both one of victimization and one that acknowledges the agency of the slave. While the former interpretation is understandable given the re-configurations of the image within the polemics of the Abolitionist campaign of the nineteenth century, the original image needs to be examined within the context of its construction. For this, it is necessary to explore the classical nature of the figure, particularly the representations and mythic significance of Hercules. These associations are combined with references to supplication as depicted in earlier token books, religious iconography, contemporary treatises on acting, eighteenth century treatises on gesture and rhetoric, and eighteenth century treatises on phrenology, physiognomy and ethnology. It is the complexity derived from such blending that became simplified and limited in later re-presentations where the image is used in conjunction with sentimental appeals to the benevolence of the viewer. As the classical resonances gave way to sentimental imperatives, the changing array of discourses changed not only the context which gave the image meaning, but reshaped the very image of the kneeling slave in subtle, but significant ways. The result provides us with a complex study of the dynamics of visual rhetoric. 相似文献