Search for dissertations about: "Sea Urchins"

Found 5 swedish dissertations containing the words Sea Urchins.

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

    University dissertation from Stockholm : Systemekologiska institutionen

    Author : Johan S. Eklöf; Stockholms universitet.; [2008]
    Keywords : 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;

    Abstract : 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. READ MORE

  2. 2. Macroalgal community dynamics on coral reefs Implications for management

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

    Author : Erik Mörk; Stockholms universitet.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Macroalgae; Coral Reefs; Herbivory; Nutrients; Ecosystem change; Fish; Sea Urchins; East Africa; Marine Ecotoxicology; marin ekotoxikologi;

    Abstract : Although rather inconspicuous on healthy coral reefs, macroalgae form the basis of coral food webs. Today, macroalgae are generally increasing and many reefs undergo transitions from coral to macroalgal dominance resulting from e.g. enhanced nutrient loading or increased fishing. READ MORE

  3. 3. The role of the jelly coat and the block to polyspermy in the fertilazation os sea urchins

    University dissertation from Uppsala : Almqvist & Wiksell

    Author : Berndt E. Hagström; Stockholms högskola.; [1956]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : .... READ MORE

  4. 4. Improving and inhibiting agents acting on the gametes and on their interaction at fertilization in sea urchins

    University dissertation from Uppsala : Almqvist & Wiksell

    Author : Elsa Wicklund; Stockholms högskola.; [1954]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : .... READ MORE

  5. 5. Exploring the resilience in coral reefs

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

    Author : Jerker Lokrantz; Stockholms universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Coral Reefs; Resilience; Functional Groups; Vulnerability; Overfishing; Ecosystem Indicators; Tanzania; Zanzibar; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi Marin ekologi; naturresurshushållning; Natural Resources Management;

    Abstract : Considering the unprecedented global decline of coral reefs concerns about their future existence are well-justified. Safeguarding ecological resilience (i.e. the capacity of ecosystems to absorb disturbance without changing their identity) has become a prime goal for management in order to combat further degradation of coral reefs. READ MORE