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871.
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
872.
An analysis of family sex composition preferences as well as the relationship between actual family sex composition and desire for no additional children among a national sample of Filipino women is presented. An emphasis on balance or son-daughter equivalence is strongest in Metropolitan Manila. Son preference is highest in rural Mindanao and Sulu, primarily due to the concentration of Muslims in this section of the country and secondarily to its pioneer environment and the presumed utility of sons in such a milieu. The importance of eliciting sex composition preferences from both husbands and wives as well as distinguishing the “striking for a balance” from sex-linked preferences in future research is discussed. 相似文献
873.
The pilot family planning studies reported in this paper were conducted in a rural area adjacent to the city of Dacca in East Pakistan. It reports the preliminary findings of action-research in the implementation of educational efforts to reach rural villagers of a developing country.Preliminary analyses of the records identify two significant educational problems: (1) most of the villagers (85-90 percent of the couples) who initially accepted contraceptives do not truly adopt and become continuing users and (2) the continuing users (10-15 percent of the initial users) are generally characterized by large families. (Later data show an even lower percentage of continuing users.)The field activities in the development of various educational approaches to family planning are described. Three separate geographic areas (from 15,000 to 20,000 population) were each approached in a different way, varying in the number and educational qualifications of the workers and in the degree of involvement of village leadership. Preliminary analyses of field records indicate that these variations of approach apparently have little effect on the percentage of the population willing to accept contraceptive supplies.It is the opinion of the writers that more intensive educational efforts are necessary at the village level to develop social support for continuing use of contraception and to gain adoption of contraception by younger married couples primarily for spacing of births.The impact of introduction of the IUCD in populations where condoms and foam tablets have been available for one to two years has also been reported. Preliminary findings indicate that the IUCD encourages adoption by previous non-users and may increase the over-all percentage of contraceptive users. 相似文献
874.
875.
Increasing attention has been directed to the effect of cognitive factors on migration decision making. We evaluate the influence of community size preference status and six domains of community satisfaction on migration intentions per se and short- vs. longterm migration intentions, separately, simultaneously, and with controls on community involvement and social position. The data are from a 1988 statewide migration survey of 851 Utahns. Separate multivariate analyses are conducted for metropolitan and nonmetropolitan residents. Satisfaction/dissatisfaction with selected features of community life primarily impacts migration intentions per se while community size preference status dominates the time frame of migration intentions. 相似文献
876.
Lee WK 《Journal of women & aging》2003,15(1):31-53
Hong Kong's population is aging but retirement research is largely missing from the research agenda in Hong Kong. This study, based on a telephone survey of 1,078 respondents, examines middle-aged adult's retirement planning activities in Hong Kong. The findings show men are more likely to be involved in financial planning, while women are more likely to take part in some forms of health, living arrangement and psychological planning for retirement. Further, there are age, education and income differences in the various forms of retirement planning activities within genders. Women are living longer; because of their lack of financial retirement planning, they are prime candidates for poverty. The discussion concludes with policy implications related to assisting midlife individuals, in particular women, in planning for retirement. 相似文献
877.
878.
Recent changes in older men's retirement patterns are investigated for the United States. The results show that labor force incumbents, particularly those in secondary occupations, experienced increases in the volume of both retirement and reentry to the labor force. In addition, although working life expectancy remained relatively stable across occupations, men in secondary occupations spent increasingly greater portions of their work lives in postretirement jobs. Finally, large increases in nonworking life expectancy occurred because of substantial increases in life expectancy. In several occupations, however, declines in working life expectancy were major contributors to increases in nonworking life expectancy. 相似文献
879.
880.
Cultural aspects of aging have great importance on how older women and men are being treated, in particular in Asia where patriarchal practices dominate. Further, changes in the structure of the Chinese family alter this supportive function, and changes in traditional values affect the nature of the care and support provided to older women and men. This proposition was investigated by a quantitative study involving a survey of 390 older persons in Hong Kong. There are great discrepancies in informal support for older women and men. Older women are less likely to live with adult children; more likely to need financial assistance; and more likely to receive poor informal support. There is evidence that informal support for the elderly is changing in Hong Kong, and older women are being disadvantaged, experiencing insufficient and unavailability of informal support. 相似文献