Avancerad sökning

Visar resultat 6 - 10 av 15 avhandlingar som matchar ovanstående sökkriterier.

1. 6. The neglected ecology of the sand goby: Abundance and feeding in the Baltic sublittoral

   Författare :Sigrid Z. Ehrenberg; Ragnar Elmgren; Sture Hansson; Gunilla Ejdung; Erik Bonsdorff; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sand goby; sublittoral; sub-thermocline; abundance; feeding; consumption; activity; Marine ecology; Marin ekologi; marin ekologi; Marine Ecology;

   Sammanfattning : I investigated the ecology and population density of the sand goby, Pomatoschistus minutus, at sub-thermocline depth in the north-western Baltic proper. Most previous research on the sand goby, and the co-occurring closely related common goby, P. LÄS MER

3. 7. Effects of Great Cormorant Predation on Fish Populations and Fishery

   Författare :Henri Engström; Sture Hansson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Great Cormorant; Phalacrocorax carbo sinensis; predation; population regulation; diet; diet preferences; eel; behavioural responses; bird-fishery conflicts; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; populationsbiologi; Population Biology;

   Sammanfattning : The strong increase in number of Great cormorants Phalacrocorax carbo in Sweden in recent years has led to conflicts - particularly with fishery. This thesis focuses on the possible effects of cormorant predation on fish populations. LÄS MER

4. 8. Summer cyanobacterial blooms in the Baltic Sea - implications for copepod recruitment

   Författare :Hedvig Hogfors; Sture Hansson; Wim Kimmerer; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cyanobacteria; Calanoid copepods; Food web interactions; Harmful algae blooms; Zooplankton; Nodularin; Allelopathy; Baltic Sea; Biochemical markers; RNA-based indices; Acidification; Global Climate Change; Marine Ecology; marin ekologi;

   Sammanfattning : During summer, the Baltic Sea is subjected to the world’s largest cyanobacterial blooms. These blooms are linked to eutrophication and raise many questions concerning their effects on the ecosystem. To understand their impacts on the food web dynamics, it is essential to assess growth responses of grazers to these cyanobacteria. LÄS MER

5. 9. Trophic interactions and behaviour : Studies relevant to a Baltic Sea biomanipulation

   Författare :Per B. Holliland; Sture Hansson; Elena Gorokhova; Peter Tiselius; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; zooplankton; non-indigenous species; selectivity; food web; rearing environment; fish stocking; Sander lucioperca; diel vertical migration; ontogeny; ovigerous; Marine Ecology; marin ekologi;

   Sammanfattning : The main theme of this thesis is the interactions of animals with the environment and each other. The thesis was written within the framework of a biomanipulation project “Pikeperch in Himmerfjärden”. LÄS MER

7. 10. Zooplankton growth and trophic linkages : Implications for fish feeding conditions in the Baltic Sea

   Författare :Towe Holmborn; Elena Gorokhova; Sture Hansson; Ilppo Vuorinen; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; AARS activity; biochemical markers; Clupea harengus; copepod physiology; food web interactions; non-indigenous species; RNA-based indices; Sprattus sprattus; stable isotopes; Marine ecology; Marin ekologi; Marine Ecology; marin ekologi;

   Sammanfattning : The aim of this Thesis was to improve our understanding and assessment of feeding conditions for zooplanktivorous fish in the Baltic Sea.We investigated (papers I, II) the usefulness of biochemical proxies for assessments of growth and metabolic rates in the dominant Baltic copepod Acartia bifilosa. LÄS MER