Search for dissertations about: "Sture Hansson"

Showing result 11 - 15 of 15 swedish dissertations containing the words Sture Hansson.

2. 11. Ecology of juvenile turbot and flounder in the Central Baltic Sea : Implications for recruitment

   Author : Jesper Martinsson; Sture Hansson; Magnus Appelberg; Anders Nissling; Leif Pihl; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Psetta maxima; Platichthys flesus; juvenile; Baltic Sea; nursery ground; distribution; recruitment; Marine Ecology; marin ekologi;

   Abstract : Our understanding of turbot and flounder ecology in the Baltic Sea is insufficient for sound management decisions. This thesis aims to fill some gaps in current knowledge by providing information of the ecology of turbot and flounder within their juvenile habitat, and to relate these findings to issues assumed relevant for recruitment variation. READ MORE

4. 12. Species interactions and energy transfer in aquatic food webs

   Author : Jens Munk Nielsen; Monika Winder; Sture Hansson; Michael T. Brett; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Aquatic food webs; zooplankton; stable isotope analysis amino acids; molecular diet analysis; Marine Ecology; marin ekologi;

   Abstract : Food webs are structured by intricate nodes of species interactions which govern the flow of organic matter in natural systems. Despite being long recognized as a key component in ecology, estimation of food web functioning is still challenging due to the difficulty in accurately measuring species interactions within a food web. READ MORE

5. 13. Studies on Baltic Sea mysids

   Author : Martin Ogonowski; Sture Hansson; Jörgen Berge; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mysids; hydroacoustics; Baltic Sea; abundance; stable isotopes; specific dynamic action SDA ; diel vertical migration; partial migration; trophic interactions; physiology; benthic-pelagic coupling; protein:DNA; C:N ratio; genetic structure; Marine Ecology; marin ekologi;

   Abstract : Mysid shrimps (Mysidacea, Crustacea) are efficient zooplanktivores in both marine and freshwater systems as well as lipid rich prey for many species of fish.  Although some efforts have been made to study the role of mysids in the Baltic Sea, very few studies have been carried out in recent time and there are still knowledge gaps regarding various aspects of mysid ecology. READ MORE

6. 14. Eel migration - results from tagging studies with relevance to management

   Author : Niklas B. Sjöberg; Sture Hansson; Håkan Wickström; Erik Petersson; Alan Walker; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Anguilla anguilla; Migration; Stocking; Marking; Anguillicola crassus; Data storage tags; Carlin tagging; Strontium; Survival analysis; Dormancy; Lake Mälaren; Baltic Sea; Atlantic Ocean; Sargasso Sea; Marine Ecology; marin ekologi;

   Abstract : In response to the drastic decline of the European eel (Anguilla anguilla (L.)) fisheries have been reduced and elvers are stocked in areas where natural abundances are low. READ MORE

7. 15. Complexity and Change in a Simple Food Web : Studies in the Baltic Sea (FAO Area 27.IIId)

   Author : Henrik Österblom; Sture Hansson; Robert W Furness; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Avian cholera; Bottom-up; Bycatch; Clupea harengus; Ecosystem; Food web; Gadus morhua; Halichoerus grypus; Regime shift; Sprattus sprattus; Top-down; Trophic cascade; Uria aalge; Marine ecology; Marin ekologi;

   Abstract : An influence at one trophic level can result in dynamic impacts also on other components of a food web. These dynamics are known as trophic cascades, and can be both top-down and bottom-up. After a near-collapse of the Baltic cod Gadus morhua stock in the 1980s, its main prey sprat Sprattus sprattus increased dramatically. READ MORE