Sökning: "roach Rutilus rutilus"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden roach Rutilus rutilus.

  1. 1. Paleolimnological reconstructions of fish population changes in acidified lakes

    Författare :Fredrik Palm; Göteborgs universitet; []
    Nyckelord :Acidification; Chaoborus; C. flavicans; C. obscuripes; Cyprinids; Daphnia; Fish loss; Fish community composition; Ephippia; Fragmentation; Mandibles; Perch; Roach; Sediments; 210-Pb chronology;

    Sammanfattning : This thesis deals with the potential of using subfossil Chaoborus spp. and Daphnia spp. remains preserved in lake sediments to reveal past fish community alterations related to progressive acidification. LÄS MER

  3. 2. The estrogen receptor in fish and effects of synthetic estrogens in the environment - Ecological and evolutionary perspectives and societal awareness

    Författare :Lina Nikoleris; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; the estrogen receptor; salmon evolution and ecology; contraceptives; information gaps; synthetic hormones; EE2; Atlantic salmon Salmo salar ; brown trout Salmo trutta ; roach Rutilus rutilus ;

    Sammanfattning : Synthetic hormones are a group of pharmaceuticals used for various human and animal treatments. However, consumption and disposal of these substances have also given rise to negative effects and environmental problems for organisms in the wild which is why these substances have been classified as estrogenic endocrine-disrupting chemicals (EDCs). LÄS MER

  4. 3. Phenotypic Processes Triggered by Biological Invasions

    Författare :Philipp E Hirsch; Richard Svanbäck; Skúli Skúlason; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Resource polymorphism; phenotypic plasticity; phenotypic divergence; anti-predator responses; Perca fluviatilis; Rutilus rutilus; Dreissena polymorpha; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

    Sammanfattning : Individuals within a single population can vary widely in their phenotype e.g. in their body shape. These differences are an important source of biodiversity and they can precede evolutionary divergence within a population. LÄS MER

  5. 4. Structural aspects of the hypothalamo-hypophysical complex of the roach, Leuciscus rutilus

    Författare :Bo Ekengren; Stockholms universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  7. 5. Environmental influence on Hg and 137Cs levels in perch (Perca fluviatilis L.) and roach (Rutilus rutilus L.) from circumneutral lakes

    Författare :Lars Sonesten; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Hg; 137Cs; fish; PLS; land use; cations; humic substances; circumneutral; Biologi; Biology; Biologi; limnologi; Limnology;

    Sammanfattning : Mercury and radioactive caesium have received immense attention in Sweden during the past decades, as common contaminants in fish. This thesis examines how the Hg and 137Cs levels in fish from 79 circumneutral lakes are affected by various environmental factors. LÄS MER