Sökning: "herring"

Visar resultat 26 - 30 av 70 avhandlingar innehållade ordet herring.

  1. 26. The ecology of the plankton fauna in the Gulf of Bothnia

    Författare :Olof Sandström; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Zooplankton; ecology; the Baltic; selective predation production biology; patchiness;

    Sammanfattning : The geographical distribution of the Gulf of Bothnia zooplankton species is presented together with observations of abundancies and vertical distributions. The historical development of this plankton community in the last 70 years is discussed.Spring and summer development of the plankton fauna was studiedin the Bothnian Bay. LÄS MER

  3. 27. Baltic cod predation: mechanisms, impact on prey, implications for fisheries

    Författare :Nataliia Kulatska; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Trophic interactions are fundamental in the functioning of ecosystems. Predator-prey interactions between cod (Gadus morhua), herring (Clupea harengus) and sprat (Sprattus sprattus) in the Baltic Sea are typical examples of strong trophic interactions with consequences on the structure of this ecosystem. LÄS MER

  4. 28. Seals and fisheries: a study of the conflict and some possible solutions

    Författare :Sara Königson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; seals and fisheries; grey seal; coastal fisheries; harbour seal; seal-safe fishing gear;

    Sammanfattning : Interaction between seals and fisheries along the Swedish coast has serious environmental and economic consequences. This thesis describes the conflict as it affects four different small-scale coastal fisheries; the eel fisheries on the west coast, the herring fisheries and salmon fisheries in the northern Baltic and the cod fisheries in the central Baltic. LÄS MER

  5. 29. Organohalogen environmental pollutants in Baltic fish : chemical characterization and toxicological evaluation with a focus on bone disturbances

    Författare :Natalia Stern; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : The present study was initiated due to concern about toxicological consequences associated with the exposure to persistent organic pollutants (POPs) via the consumption of Baltic fish. In Sweden, fish from the Baltic Sea is a major dietary source of POPs but also an important source of essential nutrients. LÄS MER

  7. 30. 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