Sökning: "salmo trutta"

Visar resultat 1 - 5 av 57 avhandlingar innehållade orden salmo trutta.

1. 1. Divergent Stress Coping Strategies in Brown trout (Salmo trutta)

   Författare :Daniel Brelin; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Stress coping; Salmo trutta; Brown trout; teleost fish; stress response; noradrenalin; adrenalin; dopamine; cortisol; hypoxia; confinement; resident-intruder; Animal physiology; Zoofysiologi;

   Sammanfattning : .... LÄS MER

3. 2. Reproductive pattern and offspring performance in brown trout (Salmo trutta)

   Författare :Hans Olofsson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Salmo trutta; spawning; egg size; fry competition; fry dispersion; Biologi; Biology; Biologi; limnologi; Limnology;

   Sammanfattning : This thesis deals with how reproductive traits and reproductive behaviour in femalebrown trout (Salmo trutta) are linked to offspring performance.In the small stream Tullviksbäcken, the choice of spawning sites was stronglyinfluenced by short-term fluctuations in stream flow and by substrate quality. LÄS MER

4. 3. Stress Coping Strategies in Brown Trout (Salmo Trutta): Ecological Significance and Effects of Sea-Ranching

   Författare :Daniel Brelin; Svante Winberg; Erik Petersson; Jörgen Johnsson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zoophysiology; Stress-coping-strategies; Animal-personalities; Behavioral-syndromes; Brown trout; Salmo trutta; Catecholamines; Sexual maturation; Hatchery; Phenotype; Learning; Zoofysiologi; Biology; Biologi;

   Sammanfattning : Two distinct stress coping strategies, proactive and reactive, have been stated in various animal studies, each associated with a set of behavioural and physiological characteristics. In a given challenging situation, proactive animals show more aggression, a higher general activity and a predominant sympathetic reaction. LÄS MER

5. 4. Behaviour and metabolic rates of brown trout and Atlantic salmon : Influence of food, environment and social interactions

   Författare :Linnea Lans; Larry Greenberg; Eva Bergman; Felicity Huntingford; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Salmo trutta; Salmo salar; behaviour; metabolic rates; Biology; Biologi;

   Sammanfattning : For Atlantic salmon (Salmo salar) and brown trout (Salmo trutta), the decision to migrate or when to migrate is believed to be influenced by the individual’s metabolic rate (MR) relative its food intake. As MR was expected to be related to behaviour, the potential links between behaviour and metabolic costs was studied. LÄS MER

7. 5. Age-class interactions in Atlantic salmon and brown trout: Effects on habitat use and performance

   Författare :Rasmus Kaspersson; Göteborgs universitet; []
   Nyckelord :competition; inter-cohort; density-dependence; growth; habitat; Salmo trutta; Salmo salar; salmon; trout;

   Sammanfattning : This thesis investigates the underlying mechanisms and the density-regulatory effects of age-class interactions, using juvenile Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.) as study species. LÄS MER