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  • Articles  (88)
  • Geography  (88)
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  • Articles  (88)
Journal
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Antipode 8 (1976), S. 0 
    ISSN: 1467-8330
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Antipode 5 (1973), S. 0 
    ISSN: 1467-8330
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    World Development 18 (1990), S. 605-615 
    ISSN: 0305-750X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geography , Political Science , Sociology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    World Development 12 (1984), S. 141-156 
    ISSN: 0305-750X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geography , Political Science , Sociology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford BSL : Blackwell Publishing Ltd
    Global change biology 3 (1997), S. 0 
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Five species of sap-feeding homoptera were studied on Fagus sylvatica and Acer pseudoplatanus and exposed to elevated concentrations of carbon dioxide (600 μL L–1). The concentration of total soluble amino acids in foliage of F. sylvatica was unaffected by growing saplings in elevated atmospheric CO2 concentrations. Although experiments on individual aphids indicated poorer performance of Phyllaphis fagi (fewer, smaller nymphs produced), resultant populations did not differ from those in ambient (350 μL L–1) conditions. The area of beech foliage stippled by the leafhopper Fagocyba cruenta was similar at ambient and elevated CO2 concentrations. The concentration of total amino acids and that of serine of A. pseudoplatanus foliage were significantly lower at elevated CO2 concentrations. However, the relative growth rates of two aphid species Drepanosiphum platanoidis and Periphyllus testudinaceus and one leafhopper Ossiannilssonola callosa were not significantly different in elevated CO2. No evidence was found that, under the conditions of these experiments, populations of aphids and leafhoppers will change as concentrations of CO2 increase.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: The phenology of Fagus sylvatica was unaffected by exposure to an atmosphere of elevated CO2 (600 μL L-1) after two years of fumigation. Non-significant changes in nitrogen and phenolic content of the leaves decreased the nutritional status of beech for female larvae in elevated CO2 such that they responded by eating in a compensatory manner; males were unaffected. Rates of development, mortality and adult biomass of Rhynchaenus fagi were no different from those in ambient CO2 concentrations (355 μL L -1). It is possible that, with the changes in leaf chemistry affecting the females, fecundity will be altered, with important consequences for populations of beech weevil.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: The biosphere–atmosphere exchange of methane (CH4) was estimated for a temperate/boreal lowland and wetland forest ecosystem in northern Wisconsin for 1997–1999 using the modified Bowen ratio (MBR) method. Gradients of CH4 and CO2 and CO2 flux were measured on the 447-m WLEF-TV tower as part of the Chequamegon Ecosystem–Atmosphere Study (ChEAS). No systematic diurnal variability was observed in regional CH4 fluxes measured using the MBR method. In all 3 years, regional CH4 emissions reached maximum values during June–August (24±14.4 mg m−2 day−1), coinciding with periods of maximum soil temperatures. In 1997 and 1998, the onset in CH4 emission was coincident with increases in ground temperatures following the melting of the snow cover. The onset of emission in 1999 lagged 100 days behind the 1997 and 1998 onsets, and was likely related to postdrought recovery of the regional water table to typical levels. The net regional emissions were 3.0, 3.1, and 2.1 g CH4 m−2 for 1997, 1998, and 1999, respectively. Annual emissions for wetland regions within the source area (28% of the land area) were 13.2, 13.8, and 10.3 g CH4 m−2 assuming moderate rates of oxidation of CH4 in upland regions in 1997, 1998, and 1999, respectively. Scaling these measurements to the Chequamegon Ecosystem (CNNF) and comparing with average wetland emissions between 40°N and 50°N suggests that wetlands in the CNNF emit approximately 40% less than average wetlands at this latitude. Differences in mean monthly air temperatures did not affect the magnitude of CH4 emissions; however, reduced precipitation and water table levels suppressed CH4 emission during 1999, suggesting that long-term climatic changes that reduce the water table will likely transform this landscape to a reduced source or possibly a sink for atmospheric CH4.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Geoforum 12 (1981), S. 71-84 
    ISSN: 0016-7185
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geography
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 67 (1998), S. 217-237 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Rainfall regimes are primarily unimodal in central and eastern Venezuela but bimodal (peaks in May–June and September-October-November with a minimum in July–August) in the northwest. There is a sharp transition across the Andes suggesting a topographic-circulation connection. However, a mid-summer minimum also occurs at other locations in Venezuela and Central America during individual years. This paper addresses the nature and control of the regimes including the role of large-scale circulation features and convection as indicated by outgoing longwave radiation data. Altitudinal characteristics of precipitation in the Andes and their spatial variability are also investigated. The development of the minimum within the rainy season annual cycle is shown to be related to the combined effects of the evolution of sea surface temperatures in the east Pacific warm pool and reinforced in the area of the Andes by enhanced easterlies during July and August.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International journal of biometeorology 9 (1965), S. 21-28 
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Alle bekannten Einflüge von LAPHYGMA EXIGUA nach England von 1947–1963 wurden in Beziehung zu den vorhergehenden möglichen Fluglinien von der Süd-Biskaya aus untersucht; statistisch wird gezeigt, dass in jedem Fall die Motten aus Südspanien oder jenseits davon kamen. Motten, die zu Beginn des Jahres eintrafen, stammten aus Gebieten südlich 40°N, in den meisten Fällen aus Marokko oder Madeira. Von Mai ab war das Ursprungsland der meisten Motten Nordwestspanien, ausgenommen 1962,als sich die Herkunft einer verhältnismässig grossen Anzahl in Südengland bis Marokko zurückverfolgen liess.
    Abstract: Resume Toutes les migrations connues de LAPHYGMA EXIGUA vers l'Angleterre entre 1947 et 1963 ont été étudiées en fonction des lignes de vol possibles à partir du Sud de la Biscaye; il est statistiquement établi que, dans tous les cas, ces mites venaient du Sud de l'Espagne ou d'au-delà. Les arrivées précoces dans l'année sont originaires de régions au Sud du 40 ème degré de Latitude Nord, la plupart du Maroc ou de Madère. A partir du mois de mai, la région d'origine de la plupart des mites a été le Nord-Ouest de l'Espagne, sauf en 1962 où les arrivées dans le Sud de l'Angleterre étaient originaires du Maroc.
    Notes: Abstract All known immigrations of the LAPHYGMA EXIGUA into Britain in the period 1947 to 1963 were examined in relation to preceding potential trajectories from South Biscay and a statistical demonstration is given that in every case moths originated from North Spain or beyond. Arrivals early in the year are shown to have originated from south of 40°N, and in most cases from Morocco or Madeira.From May onwards,however, moths came mainly from North-west Spain, except in 1962 when relatively huge numbers in southern England could also be traced back to Morocco.
    Type of Medium: Electronic Resource
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