Sökning: "alternative stable states"

Visar resultat 1 - 5 av 22 avhandlingar innehållade orden alternative stable states.

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

    Detta är en avhandling från Stockholm : Department of Systems Ecology, Stockholm University

    Författare :Albert Norström; Magnus Nyström; Nancy Knowlton; [2010]
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

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

    Detta är en avhandling från Umeå : Ekologi, miljö och geovetenskap

    Författare :Arne Schröder; Lennart Persson; André M. de Roos; Tim Benton; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biomass overcompensation; Chaoborus; emergent Allee effect; Heterandria formosa; juvenile recruitment bottlenecks; ontogenetic niche shifts; Poecilia reticulata; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Sammanfattning : 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. LÄS MER

  3. 3. Paramagnetic states of diiron carboxylate proteins

    Detta är en avhandling från Stockholm : Institutionen för biokemi och biofysik

    Författare :Nina Voevodskaya; Astrid Gräslund; Peter Brzezinski; Howard Dalton; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electron paramagnetic resonance; diiron carboxilate proteins; ribonucleotide reductase; alternative oxidase; TECHNOLOGY Engineering physics Biophysics; TEKNIKVETENSKAP Teknisk fysik Biofysik;

    Sammanfattning : Diiron carboxylate proteins constitute an important class of metall-containing enzymes. These proteins perform a multitude of reactions in biological systems that normally involve activation of molecular oxygen at the diiron site. LÄS MER

  4. 4. Waterfowl herbivory on submerged macrophytes in eutrophic lakes

    Detta är en avhandling från Håkan Sandsten, Ecology Building, 22362 Lund, Sweden

    Författare :Håkan Sandsten; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; limnology; Marinbiologi; limnologi; Hydrobiology; Växtekologi; Plant ecology; akvatisk ekologi; Djurekologi; Animal ecology; Anas; Fulica atra; Cygnus; alternative stable states; water depth; distribution; plant species composition; hydrophytes; propagule size; Herbivory; tuber; Potamogeton; marine biology; aquatic ecology;

    Sammanfattning : Submerged macrophytes are thought to stabilize clear-water states of shallow lakes. The aim of this thesis was to elucidate how waterfowl herbivory can affect abundance, distribution and species composition of submerged macrophytes in eutrophic lakes. LÄS MER

  5. 5. Hydrodynamics of very shallow lakes - A study in Lake Krankesjön, Sweden

    Detta är en avhandling från Håkan Sandsten, Ecology Building, 22362 Lund, Sweden

    Författare :Charlotta Borell Lövstedt; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; alternative stable states; field measurements; reed; resuspension; wave damping; waves; differential heating; vegetation; convective currents;

    Sammanfattning : Shallow lakes have great ecological and recreational values. They are also largely affected by humans, mainly through eutrophication, and great efforts are therefore being put into the understanding of these ecosystems. The knowledge is however not complete, and more research is needed to manage these lakes in a sustainable way. LÄS MER