Search for dissertations about: "Baltic herring Clupea harengus"

Showing result 11 - 14 of 14 swedish dissertations containing the words Baltic herring Clupea harengus.

  2. 11. Disentangling small genetic differences in large Atlantic herring populations: comparing genetic markers and statistical power

    Author : Lena C. Larsson; Linda Laikre; Nils Ryman; Lorenz Hauser; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; conservation genetics; marine fish; spatial and temporal genetic variation; molecular marker comparison; allozyme; microsatellite; selection; fisheries management; Biology; Biologi; populationsgenetik; Population Genetics;

    Abstract : Genes are the foundation of evolution and biodiversity. The genetic structure of natural populations needs to be understood to maintain exploited resources rationally. This thesis focuses on genetic variability and methods to determine spatial and temporal genetic heterogeneities. READ MORE

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

    Author : Natalia Stern; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : 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. READ MORE

  5. 13. Fish predation by the great cormorant (Phalacrocorax carbo sinensis) : analytical basis for ecosystem approaches

    Author : Maria Ovegård; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This thesis concerns the diet of a piscivorus top predator, the Great Cormorant (Phalacrocorax carbo sinensis), in the Baltic Sea. The Great Cormorant has increased exponentially in numbers during the last decades. This has resulted in a human-cormorant conflict because of its perceived competition with fisheries and negative impact on ecosystems. READ MORE

  6. 14. Improved Assessment in Environmental Monitoring of POPs : Using monitoring data from the aquatic ecosystem and human milk

    Author : Elisabeth Nyberg; Anders Bignert; Jochen Mueller; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Environmental monitoring; temporal trends; power analysis; sampling strategy; PCBs; DDTs; HCHs; HCB; PCDD Fs; fish; bird eggs; blue mussels; human milk; miljökemi; Environmental Chemistry;

    Abstract : The thesis deals with several aspects of monitoring of persistent organic contaminants (POPs) in biological matrices, for example choice of sample, sampling design, and statistical treatment of data both for temporal and spatial trends and for compliance towards a set target value. The efficiency has been evaluated through statistical power analyses. READ MORE