Search for dissertations about: "alternative stable state"

Showing result 1 - 5 of 42 swedish dissertations containing the words alternative stable state.

  1. 1. Upholding the coral loop Resilience, alternative stable states and feedbacks in coral reefs

    University dissertation from Stockholm : Department of Systems Ecology, Stockholm University

    Author : Albert Norström; Stockholms universitet.; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; resilience; alternative stable states; regimes; feedbacks; recruitment; coral reefs; marine ecosystem management; regime shifts; phase shifts; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Marine ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Marin ekologi; Natural Resources Management; naturresurshushållning;

    Abstract : Coral reefs are suffering unprecedented declines in coral cover and species diversity. These changes are often associated with  substantial shifts in community structure to new dominant organisms. Ultimately, these “phase shifts” can be persistent and very difficult to return from. READ MORE

  2. 2. Alternative Stable States in Size-Structured Communities Patterns, Processes, and Mechanisms

    University dissertation from Umeå : Ekologi, miljö och geovetenskap

    Author : Arne Schröder; Umeå universitet.; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biomass overcompensation; Chaoborus; emergent Allee effect; Heterandria formosa; juvenile recruitment bottlenecks; ontogenetic niche shifts; Poecilia reticulata; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Abstract : Alternative stable states have been, based on theoretical findings, predicted to be common in ecological systems. Empirical data from a number of laboratory and natural studies strongly suggest that alternative stable states also occur in real populations, communities and ecosystems. READ MORE

  3. 3. Long-lasting ecological legacies of reindeer on tundra vegetation

    University dissertation from Umeå : Umeå University

    Author : Dagmar D. Egelkraut; Umeå universitet.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Alternative stable state; Herbivory; Historical contingency; Nutrient cycling; Plant-herbivore interactions; Plant-soil feedbacks; Rangifer tarandus; Reindeer herding; Traditional land use; Tundra vegetation;

    Abstract : Reindeer can have strong effects on the plant species composition and functioning of tundra ecosystems, and often promote a transition towards a graminoid-dominated vegetation type. As a result, they influence many ecological processes, such as nutrient dynamics, soil biotic composition and functioning, and carbon storage. READ MORE

  4. 4. Submerged macrophytes in shallow eutrophic lakes - regulating factors and ecosystem effects

    University dissertation from Limnology, Department of Ecology, Lund University

    Author : John A Strand; Lund University.; Lunds universitet.; [1999]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; marine biology; Hydrobiology; plasticity; seed banks; periphyton; grazing; alternative stable state; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

    Abstract : In this thesis I have studied factors that regulate submerged macrophyte abundance, morphology and distribution in shallow eutrophic lakes, and how submerged macrophytes may affect the ecosystem. Light attenuation through the water column (turbidity and water depth) is probably not the most important factor regulating the distribution of submerged vegetation in macrophyte dominated shallow eutrophic lakes, e. READ MORE

  5. 5. Competing Under Pressure State Anxiety, Sports Performance and Assessment

    University dissertation from Stockholm : Psykologiska institutionen

    Author : Carolina Lundqvist; GIH. Gymnastik- och idrottshögskolan; Stockholms universitet.; [2006]
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Samhällsvetenskap Humaniora; Social Sciences Humanities; SOCIAL SCIENCES Social sciences Psychology; SAMHÄLLSVETENSKAP Socialvetenskap Psykologi; competition; intra-individual variability; directional interpretations; emotions; sports performance; CSAI-2; psychometrics;

    Abstract : Elevated levels of anxiety are a common response to stressful competitive sports situations, are known to moderate athletic performance and are referred to as an unpleasant emotional state associated with perceptions of situational threat. The empirical studies in this dissertation considered primarily psychometric, methodological and conceptual issues of relevance for the study of anxiety and sports performance. READ MORE