Sökning: "sea urchins"

Hittade 5 avhandlingar innehållade orden sea urchins.

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

    Författare :Johan S. Eklöf; Nils Kautsky; Patrik Rönnbäck; Teresa Alcoverro; Stockholms universitet; []
    Nyckelord :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

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

    Författare :Erik Mörk; Nils Kautsky; Magnus Nyström; Tim R. McClanahan; Stein Fredriksen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Macroalgae; Coral Reefs; Herbivory; Nutrients; Ecosystem change; Fish; Sea Urchins; East Africa; marin ekotoxikologi; Marine Ecotoxicology;

    Sammanfattning : 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. LÄS MER

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

    Författare :Berndt E. Hagström; Stockholms högskola; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

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

    Författare :Elsa Wicklund; Stockholms högskola; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  7. 5. Exploring the resilience in coral reefs

    Författare :Jerker Lokrantz; Magnus Nyström; Morgan Pratchett; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Coral Reefs; Resilience; Functional Groups; Vulnerability; Overfishing; Ecosystem Indicators; Tanzania; Zanzibar; Marine ecology; Marin ekologi; naturresurshushållning; Natural Resources Management;

    Sammanfattning : 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. LÄS MER