Sökning: "Akvatisk ekologi"

Visar resultat 36 - 40 av 98 avhandlingar innehållade orden Akvatisk ekologi.

  1. 36. Food Quality for Zooplankton in Humic Lakes

    Författare :Kelly Gutseit; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; limnology; Hydrobiology; marine biology; Clear water lakes; Plankton; Seston; Elements; Fatty acids; Humic lakes; Food quality; Zooplankton; limnologi; akvatisk ekologi; aquatic ecology; Marinbiologi;

    Sammanfattning : Food quality affects growth, reproduction and community structure of zooplankton, and has implications for nutrient cycling and the transfer of energy and matter in aquatic food chains. While the issue of food quality in clear water lakes has received great recent attention, studies on food quality for zooplankton in humic lakes are scarce. LÄS MER

  3. 37. Zooplankton responses to threats from UV and predation

    Författare :Samuel Hylander; MPEA ; Zooplankton Ecology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Akvatisk ekologi; Aquatic Ecology;

    Sammanfattning : .... LÄS MER

  4. 38. Ecological implications of the production of toxic substances by fish killing phytoplankton species grown under variable N:P-ratios

    Författare :Niclas Johansson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; mixotrophy; grazing; allelopathic interactions; allelopathy; algae; phytoplankton; nutrient limitation; toxicity; Toxic haptophytes; fishkilling phytoplankton; Hydrobiology; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

    Sammanfattning : The influence of different nutrient conditions on the production of toxins was studied in certain fishkilling haptophytes (e.g. Prymnesium parvum and Chrysochromulina polylepis). LÄS MER

  5. 39. Phytoplankton defense mechanisms against grazing : the role of grazing infochemicals

    Författare :Veronica Lundgren; Edna Granéli; Takeshi Yasumoto; Aaron Barkoh; Linnéuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Akvatisk ekologi; Aquatic Ecology;

    Sammanfattning : Many phytoplankton species have evolved a variety of different defenses to decrease losses from grazing; morphological features, changes in life-history/behavior, and production of toxins. These defenses may be associated with costs. Therefore, some phytoplankton only express the defense when needed, i.e. LÄS MER

  7. 40. Waterfowl in temperate eutrophic lakes - Interactions with macroinvertebrates, submerged vegetation and fish

    Författare :Ola Marklund; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Hydrobiology; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi; Chara; Asellus; chironomidae; ultraviolet radiation; epiphytes; predation; herbivory; diel vertical migration; fish; Waterfowl; macroinvertebrates; submerged vegetation;

    Sammanfattning : The aim of this thesis was to explore some of the important links between waterfowl and the biota in shallow eutrophic lakes in temperate areas. Waterfowl depend on macroinvertebrates as sources of protein and calcium, which are essential for egg production and growth. Macroinvertebrates in turn depend on submerged vegetation for food and shelter. LÄS MER