Sökning: "crucian carp"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden crucian carp.

  1. 1. Defence on Demand : A physiological perspective on phenotypic plasticity in anti-predator traits

    Författare :Jerker Vinterstare; Enhet akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Phenotypic plasticity; inducible defences; stress physiology; cortisol; immune function; trade-offs; sexual dimorphism; crucian carp; visual ecology; predator-prey interactions; POMC pro-opiomelanocortin ; colour change; eco-immunology; Anti-predator defences; Inducible morphological defence; Phenotypic plasticity; Stress physiology; Cortisol; Immune function; Crucian carp; Predator-prey interactions; Trade-offs; Sexual dimorphism; POMC; Pro-opiomelanocortin; Visual ecology; Eye evolution; Melanin; Eco-immunology; Pace-of-life; Behavioural plasticity;

    Sammanfattning : Almost all species face some degree of predation risk, and, hence, evolution has produced a plethora of anti-predator defences. However, anti-predator strategies require resources, and the prevailing risk of becoming prey is influenced by many factors and rarely constant across time and space. LÄS MER

  3. 2. Mechanisms of failure and survival in the anoxic fish brain : With focus on the crucian carp

    Författare :Dan Johansson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi; Biology; Biologi; limnologi; Limnology;

    Sammanfattning : Neural responses to anoxia were studied in two fish species, the rainbow trout(Oncorhynchus mykiss) and the crucian carp (Carassius carassius). The rainbow troutbrain reacted to anoxia by a massive release of excitatory amino acids and K+ into theextracellular compartment, in a fashion very much like the brain of mammals duringanoxia. LÄS MER

  4. 3. Phenotypic plasticity and the evolution of an inducible morphological defence in crucian carp

    Författare :Lars Pettersson; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal ecology; Benefits; Costs; Predation; Chemical cues; Fish; Djurekologi;

    Sammanfattning : In this thesis, I have investigated factors (cues, benefits, and costs) affecting the evolution of an inducible morphological defence in crucian carp (Carassius carassius). Inducible defences are favoured over permanent defences when prey have reliable cues to detect predators, when defences are effective but costly, and when predation pressure is variable and unpredictable, but sometimes strong. LÄS MER

  5. 4. Responses of male crucian carp (Carassius carassius) and goldfish (Carassius auratus) to hormonal sex pheromones

    Författare :Rickard Bjerselius; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  7. 5. Piscivore-prey fish interactions - consequences of changing optical environment

    Författare :Lynn Ranåker; Enhet akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; behaviour; brownification; freshwater ecosystems; growth; piscivore-prey fish interactions; selectivity; turbidity;

    Sammanfattning : Predator-prey interactions are a primary structuring force in aquatic systems. A change in the predator-prey interactions may cause a change in the strength of trophic cascades and even resulting in ecosystem shifts. LÄS MER