Sökning: "ingestion rates"

Visar resultat 6 - 10 av 17 avhandlingar innehållade orden ingestion rates.

  1. 6. Mysid growth, stable isotope fractionation, and energetics : implications for food web studies

    Författare :Elena Gorokhova; Ora Johansson; Stockholms universitet; []
    Nyckelord :Systems Ecology; systemekologi;

    Sammanfattning : Field data, stable isotope analyses of the Baltic Sea food web structure,and experimental studies of the functional response indicate that theomnivorous crustacean Mysis mixta (Crustacea, Mysidacea) has no distinct trophic position, but can potentially affect plankton communitystructure and compete with herring and sprat for the zooplankton. Toevaluate field data on mysid body constituents, abundance and populationstructure, and that of their potentialprey, basic knowledge of feeding behaviour, growth mechanisms, andreproductive capabilities are required. LÄS MER

  3. 7. Metabolic disturbances in shift workers

    Författare :Berndt Karlsson; Giovanni Costa; Umeå universitet; []
    Nyckelord :shift work; epidemiology; mortality; diabetes; stroke; coronary heart disease; obesity; triglycerides; HDL-cholesterol; insulin; glucose; Occupational and Environmental Medicine; arbets- och miljömedicin;

    Sammanfattning : An increased risk for coronary heart disease among shift workers is earlier shown in the epidemiological literature. The aim of this thesis has been to penetrate metabolic disturbances and obesity among shift workers compared to day workers, and to compare if there are differences in total mortality or cause specific mortality of coronary heart disease (CHD), diabetes or ischaemic stroke in between the two groups. LÄS MER

  4. 8. The importance of terrestrial carbon in plankton food webs

    Författare :Cesar Bolivar Daniel; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Ecology; lakes; carbon; zooplankton; Spumella elongata; Poterioochromonas malhamensis; flagellates; bacteria; stable isotopes; photochemistry; autochthonous; DOC; allochthonous; plankton; Ekologi; Hydrobiology; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

    Sammanfattning : Allochthonous substances, i.e. produced in terrestrial ecosystems, are known to fuel bacterial production in humic lakes. I observed that allochthonous carbon subsidizes bacteria even at high levels of phytoplankton biomass. LÄS MER

  5. 9. Effects of toxin-producing phytoplankton on copepods: feeding, reproduction and implications to the fate of toxins

    Författare :Betina Kozlowsky-Suzuki; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Ekologi; GSH transferase; oocyte development; fate of toxins; toxin accumulation; toxic phytoplankton; copepods;

    Sammanfattning : Phytoplankton growth and loss rates are governed by several factors and in many cases, when growth control fails, algal blooms are established. Such blooms can be formed by different phytoplankton species and some of them have harmful impacts on marine ecosystems. LÄS MER

  7. 10. Role of sediment organic matter quality and benthic organisms for the fate of organic contaminants in marine systems

    Författare :Maria E. Granberg; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sediment; ecotoxicology; macrofauna; bacteria; PAH; PCB;

    Sammanfattning : Marine sediments constitute important contaminant sources within our environment. Organic matter input to marine sediments changes seasonally in terms of both quantity and quality, and has been profoundly altered in many coastal areas due to eutrophication. LÄS MER