Sökning: "Asellus"

Visar resultat 1 - 5 av 10 avhandlingar innehållade ordet Asellus.

1. 1. Cholesterol and apolipoprotein E in suicidal behavior

   Författare :Peter Asellus; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Introduction: Low cholesterol has repeatedly been associated with an increased risk of suicidal and violent behavior. The increase in risk is believed to be associated with alterations in serotonergic signaling, which is associated with low cholesterol. LÄS MER

3. 2. 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

4. 3. Behaviour under predation risk - antipredator strategies, behavioural syndromes and sex-specific responses in aquatic prey

   Författare :Sanna Harris; Biodiversitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; phenotypic integration; Poecilia reticulata; Asellus aquaticus; behavioural syndromes; chemical cues; predation; antipredator behaviour;

   Sammanfattning : In many natural ecosystems, predation is well recognized as a strong evolutionary force, and predator-mediated selection has been demonstrated to induce changes in prey morphology, life history and behaviour. In my thesis, I have focused on behavioural responses in aquatic prey under the risk of predation. LÄS MER

5. 4. Mating strategies and sexual conflicts in aquatic invertebrates: consequences for evolutionary differentiation

   Författare :Kristina Karlsson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Asellus aquaticus; Dytiscidae; gender bias; genetic polymorphism; mate guarding; parallel evolution; plasticity; population divergence; sexual conflict; sexually antagonistic selection; sexual selection;

   Sammanfattning : In this thesis I investigated how mating related strategies may differ among populations and how these strategies evolve in response to their local ecological environments. I have used two different study systems of aquatic invertebrates: diving beetles (Dytiscidae) and the fresh water isopod Asellus aquaticus. LÄS MER

7. 5. Local adaptive pigmentation in Asellus aquaticus -effects of UV-radiation and predation regime

   Författare :Jonas Johansson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Marinbiologi; limnology; aquatic ecology; marine biology; Hydrobiology; Ekologi; Ecology; damselfly; perch; UV-avoidance; isopod; anti-predator traits; evolution; selective predation; limnologi; akvatisk ekologi; Animal ecology; Djurekologi;

   Sammanfattning : Pigmentation in the freshwater isopod Asellus aquaticus differed between two habitats. Asellus were lighter pigmented in stands of submerged stonewort vegetation, than in nearby reed stands. Moreover, Asellus pigmentation became lighter with time in recently established stonewort stands. LÄS MER