Sökning: "ecosystems"

Visar resultat 11 - 15 av 749 avhandlingar innehållade ordet ecosystems.

1. 11. Dynamics of omnivorous crayfish in freshwater ecosystems

   Författare :Karin Olsson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; crayfish; freshwater ecosystems; niche width; growth rate; stable isotope analysis; recruitment; RNA:DNA analysis; Ecology; food availability and quality; trophic position; population dynamics;

   Sammanfattning : In this thesis I examine the dynamics of crayfish in streams and lakes. I have studied the influence of abiotic and biotic factors on abundance, growth, trophic position, niche breadth, and recruitment of crayfish, by conducting field studies, an outdoor channel experiment and timeseries analysis. LÄS MER

3. 12. The evolution of markets - A service ecosystems perspective

   Författare :Kaisa Koskela-Huotari; Per Skålén; Bo Edvardsson; Stephen L. Vargo; Hope Schau; Karlstads universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Market; innovation; market evolution; service ecosystems; institutions; institutional change; value cocreation; service-dominant logic; conceptual research; transdisciplinary research; Business Administration; Företagsekonomi;

   Sammanfattning : This conceptual dissertation aims to build an integrative and transdisciplinary framework of market evolution by reconnecting the study of innovations and markets, with help from the service ecosystems perspective. The service ecosystems perspective offers a processual, systemic, and institutional view on value creation, which is grounded in the axiomatic assumptions of service-dominant (S-D) logic. LÄS MER

4. 13. Effects of Marine Protected Areas on Tropical Seagrass Ecosystems

   Författare :Elisa Alonso Aller; Johan S Eklöf; Charlotte Berkström; Martin Gullström; Glenn Hyndes; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; coastal ecosystems; seagrass; marine protected areas; management; conservation; fish; herbivory; Western Indian Ocean; East Africa; tropical; Marine Ecology; marin ekologi;

   Sammanfattning : Seagrass beds are highly productive coastal ecosystems that sustain a rich and diverse associated fauna and flora. Increasing anthropogenic pressures threaten seagrass ecosystems and have already led to major seagrass losses across the world. LÄS MER

5. 14. Entrepreneurial Ecosystems in Life Science Industry : A study of start-ups, scale ups and resilience of Entrepreneurial Ecosystems

   Författare :Janna Alvedalen; Innovationsteknik; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Entrepreneurial ecosystems; Life Sciences; Sweden; US; scale up; high-growth firms; Resilience; place leadership; social capital; entrepreneurship; closure of large firm; productive entrepreneurship;

   Sammanfattning : The Entrepreneurial Ecosystem (EE) literature has presented itself as promising in recent years, as it adopts a systemic network approach on entrepreneurship. Despite its popularity, scholars have also raised some serious concerns, showing it is yet a rather underdeveloped concept. LÄS MER

7. 15. Swedish seagrass ecosystems in a changing climate : Coastal connectivity and global change sensitivity

   Författare :Diana Perry; Martin Gullström; Jason Hall-Spencer; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; coastal seascape; shallow-water ecosystems; fish assemblages; connectivity; global change; climate change; multiple stressors; seagrass; Zostera marina; temperate region; Marine Ecology; marin ekologi;

   Sammanfattning : Coastal shallow-water ecosystems are essential for providing several goods and services globally, with seagrasses as an important contributor for maintaining high biodiversity and productivity within the nearshore seascape. The temperate species Zostera marina serves as a vital habitat for many species, including ecologically and economically important juvenile fish. LÄS MER