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  • EPA  (1)
  • Fruit production  (1)
  • Key words: Interstate migration  (1)
  • Springer  (3)
  • American Physical Society
  • 1995-1999  (3)
  • 1960-1964
Collection
Keywords
Publisher
  • Springer  (3)
  • American Physical Society
Years
  • 1995-1999  (3)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Seedling establishment in an epiphytic orchid: an experimental study of seed limitation (1996)
    Springer
    Oecologia 106 (1996), S. 192-198 
    Details
    ISSN: 1432-1939
    Keywords: Pollination limitation ; Selection potential ; Seed dispersal ; Microsite limitation ; Fruit production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Will increased fruit and seed production in a severely pollination-limited orchid stimulate population growth? We tested whether safe sites for germination and seedling establishment are limiting for the twig epiphyte, Tolumnia variegata, by manipulating fruit set and monitoring subsequent seedling establishment for two seasons (1991–1992, 1992–1993). In the Cambalache Forest Reserve of Puerto Rico, we established 36 plots along a transect. Each plot consisted of nine trees. A center tree was designated as the site for attaching Tolumnia and manipulating fruit set. The other eight potential host trees were 1–3 and 3–5 m from the center tree in each of the cardinal directions. A 1-m length of stem 1 m from the ground was monitored for recruits on each of the nine trees of 24 fruit-enhanced plots and 12 controls (23 and 13, respectively for the 1992–1993 season). Fruit enhancement plots were divided among two treatments: one-fruit and five-fruit additions for the 1st year and one to five and more than five fruits for the 2nd year. Availability of suitable host species was not limiting. T. variegata showed little specificity for host tree species, good host trees and shrubs were common, and there was no evidence that the orchid had a preference for small branches, despite possessing the entire suite of characteristics thought to respresent “obligate” twig epiphytes. Fruit enhancement increased seed rain and seedling establishment consistently in only the high-fruit treatment plots. Most recruitment occurred near fruiting plants. Over the 2-year period, mortality was 18% for adults and 85.5% for the 1991–1992 cohort of recruits. Net recruitment was positive for both the treatment (average = 1.74) and control plots (average = 0.67). Seedling establishment at our study site was not microsite-limited. If selection for increased pollinator attraction occurs, then an increase in seed output should result in population growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328598
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An empirical analysis of the welfare magnet debate using the NLSY (1999)
    Springer
    Journal of population economics 12 (1999), S. 391-409 
    Details
    ISSN: 1432-1475
    Keywords: JEL classification: I38 ; Key words: Interstate migration ; welfare ; poverty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract. This paper examines the extent to which differences in welfare generosity across states leads to interstate migration. Using microdata from the National Longitudinal Survey of Youth (NLSY) between 1979 and 1992, we employ a quasi-experimental design that utilizes the categorical eligibility of the welfare system. The pattern of cross-state moves among poor single women with children, who are likely to be eligible for benefits is compared to the pattern among other poor households. We find little evidence indicating that welfare-induced migration is a widespread phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001480050105
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  • 3
    Electronic Resource
    Electronic Resource
    Best management practices for storm water at industrial facilities (1996)
    Springer
    Water, air & soil pollution 90 (1996), S. 153-162 
    Details
    ISSN: 1573-2932
    Keywords: Best Management Practices (BMPs) ; Clean Water Act (CWA) ; discharge ; EPA ; general permit ; housekeeping ; National Pollutant Discharge Elimination System (NPDES) ; runoff ; sheet-flow ; source control ; storm water pollution prevention plan (SWPPP) ; treatment control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Contaminated storm water runoff has been identified as a significant source of degradation to our nation's waterways. Industrial and construction activities are primary sources of this contamination. After identifying this problem, Congress passed the Clean Water Act Amendments of 1987 which required EPA to publish regulations to control storm water discharges from certain activities. As a result, industrial facilities subject to the program are required to obtain permits and implement controls referred to as Best Management Practices (BMPs) to reduce the pollutants in the storm water runoff from their sites. BMPs can be implemented to reduce contaminants from entering storm water (source controls) or to treat storm water after it has contacted industrial areas (treatment controls). In general, source controls are more effective in reducing pollutant levels in storm water runoff, and are therefore, preferred by EPA and other regulatory agencies. This paper provides an overview of the EPA Storm Water Program which also applies to most state programs and discusses methods to identify and implement BMPs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619277
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