Sökning: "natural disturbances"

Visar resultat 1 - 5 av 187 avhandlingar innehållade orden natural disturbances.

  1. 1. Interactions between climate, natural disturbances, and regeneration in boreal and hemi-boreal forests

    Detta är en avhandling från Section of Plant Ecology and Systematics, Ekologi Huset, S-223 62 Lund, Sweden

    Författare :Igor Drobyshev; Lund University.; Lunds universitet.; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; conservation strategies; Plant ecology; Växtekologi; taiga; seasonal climate; shoot increment; larch; reconstruction; human; canopy gap; fire history; boreal; natural disturbances; dendrochronology;

    Sammanfattning : Natural disturbance is an important driving force of community dynamics in many forest types around the globe. Understanding spatial and temporal properties of disturbance events in the present and in the past is important in formulating the nature conservation strategies as well as for the modeling of climate and human impacts on forest vegetation. LÄS MER

  2. 2. A network perspective on ecosystems, societies and natural resource management

    Detta är en avhandling från Stockholm : Institutionen för systemekologi

    Författare :Örjan Bodin; Stockholms universitet.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; network; seed dispersal; pollination; natural resource management; lemur catta; social networks; landscape fragmentation; Madagascar; East Africa; fisheries; resilience; co-management; NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : This thesis employs a network perspective in studying ecosystems and natural resource management. It explores the structural characteristics of social and/or ecological networks and their implications on societies’ and ecosystems’ ability to adapt to change and to cope with disturbances while still maintaining essential functions and structures (i. LÄS MER

  3. 3. Ecological restoration of natural disturbances in boreal forests

    Detta är en avhandling från Stockholm : Institutionen för systemekologi

    Författare :Ruaridh Hägglund; Sveriges lantbruksuniversitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Worldwide declines in biodiversity have accentuated the need for conservation actions. Unfortunately, the decline is unlikely to be reversed by traditional conservation alone. Instead the practice of ecological restoration has come to play an ever increasing role. LÄS MER

  4. 4. Anthropogenic Disturbances and Shifts in Tropical Seagrass Ecosystems

    Detta är en avhandling från Stockholm : Systemekologiska institutionen

    Författare :Johan S. Eklöf; Stockholms universitet.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Aquaculture; feedback mechanisms; Kenya; management; overgrazing; regime shift; resilience; seagrass; seaweed farming; sea urchins; Tanzania; trophic cascades; Zanzibar; NATURAL SCIENCES; NATURVETENSKAP; Marine Ecotoxicology; marin ekotoxikologi;

    Sammanfattning : Seagrasses constitute the basis for diverse and productive ecosystems worldwide. In East Africa, they provide important ecosystem services (e.g. fisheries) but are potentially threatened by increasing resource use and lack of enforced management regulations. LÄS MER

  5. 5. Rarity in boreal stream: patterns, causes and consequences

    Detta är en avhandling från Stockholm : Systemekologiska institutionen

    Författare :Per-Ola Hoffsten; Umeå universitet.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Central Sweden; site occupancy; dispersal limitation; natural disturbances; recolonization; flight-morphology; metapopulation; habitat stability; spring specialists; Crunoecia irrorata; niche limitation; Isogenus nubecula; nestedness; longitudinal distribution; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi; zooekologi; Animal Ecology;

    Sammanfattning : Patterns of site occupancy among boreal stream insects were studied in central Sweden with focus on sparsely distributed species and the role of dispersal and niche limitations.In the study of dispersal limitation, I found that effects of an extraordinarily harsh winter in small to medium-sized streams were strongest in sites located in small streams and far from lake outlets. LÄS MER