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Visar resultat 1 - 5 av 29 avhandlingar som matchar ovanstående sökkriterier.
1. Upholding the coral loop : Resilience, alternative stable states and feedbacks in coral reefs
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. Alternative Stable States in Size-Structured Communities : Patterns, Processes, and Mechanisms
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. Paramagnetic states of diiron carboxylate proteins
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. Waterfowl herbivory on submerged macrophytes in eutrophic lakes
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. Hydrodynamics of very shallow lakes - A study in Lake Krankesjön, Sweden
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