Search for dissertations about: "acidity effects"

Showing result 1 - 5 of 35 swedish dissertations containing the words acidity effects.

  2. 1. Comparative Population Ecology in Moor Frogs with Particular Reference to Acidity

    Author : Fredrik Söderman; Anssi Laurila; Jacob Höglund; Juha Merilä; J.W (Pim) Arntzen; Uppsala universitet; []
    Keywords : Biology; Amphibians; Life-history; Trade-off; Environmental stress; Local adaptation; Acidity; Biologi;

    Abstract : This thesis is an attempt to describe how different environmental factors influence life history traits in different populations, sexes and developmental stages in the moor frog, Rana arvalis. The studied populations are located along 1100 km latitudinal gradient, with pH varying between 4.0 and 8.5. READ MORE

  4. 2. Formation and Transformation of Atmospheric Brown Carbon (BrC)

    Author : Kalyan Mitra; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; brown carbon BrC ; primary organic aerosol POA ; secondary organic aerosol SOA ; BrC bleaching; BrC browning; Toluene photo-oxidation; NOx; Ammonia; NH3; acidity effects; light absorption;

    Abstract : Atmospheric brown carbon (BrC) aerosol absorbs light in the UV-Vis spectrum and has poorly constrained but potentially large climate forcing impacts. Most current climate models lack detailed chemistry and interlinked properties of atmospheric BrC, that induce large uncertainties in radiative forcing predictions. READ MORE

  5. 3. Plant colonization of oak plantations - the interactive effects of local environment and land-use history

    Author : Karin Valtinat; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nitrogen mineralization; Phosphorus; Plant ecology; Växtekologi; Soil acidity; Seed sowing; Dispersal limitation; Species diversity; Indicator species analysis; Functional groups; Succession; Understory vegetation; Land-use history; Temperate forest;

    Abstract : In Europe, only small fragments of deciduous woodlands remain intact and species dependent on this ecosystem have declined. In southern Sweden, a shifting trend during the 20th century, with more afforestations on former arable land, resulted in new oak stands. These new stand are either on former arable fields or on continuously forested land. READ MORE

  6. 4. What are the effects of natural versus human-caused acidity on stream species diversity and ecosystem functioning?

    Author : Zlatko Petrin; Björn Malmqvist; Steve J. Ormerod; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; acid rain; aquatic insects; biodiversity; ecosystem function; Biology; Biologi;

    Abstract : Human activities have caused acidification of freshwater systems on a large scale resulting in reduced species diversity and ecological functioning in many lakes and streams. However, many naturally acidic freshwater systems have also been found, for instance in northern Sweden. READ MORE

  7. 5. Evolutionary implications of acidification: a frog’s eye view

    Author : Katja Räsänen; Andrew Hendry; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; acid stress; amphibians; local adaptation; maternal effects; maternal investment; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

    Abstract : Understanding the diversity of life is one of the main aims of evolutionary biology, and requires knowledge of the occurrence and causes of adaptive genetic differentiation among geographically distinct populations. Environmental stress caused by acidity may cause strong directional selection in natural populations, but is little explored from an evolutionary perspective. READ MORE