Sökning: "anti-predator behaviour"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden anti-predator behaviour.

1. 1. Early life stages of brown trout - Anti-predator responses under warming winters

   Författare :Karl Filipsson; Eva Bergman; Ann Erlandsson; Johan Watz; Martin Österling; Neil Metcalfe; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; behaviour; climate; cortisol; development; egg incubation; embryo; gene expression; ice; light; mRNA; piscivorous; poikilotherm; salmonid; stress; temperature; Biology; Biologi;

   Sammanfattning : During winter, juvenile salmonids in boreal streams are vulnerable to predation, mainly from mammals and birds. Encounters with terrestrial predators can be reduced or avoided if fish limit activity to the darker periods of the day or to periods with surface ice. LÄS MER

3. 2. From behaviour to genes: anti-predator responses of brown trout (Salmo trutta) under winter conditions

   Författare :Karl Filipsson; Eva Bergman; Ann Erlandsson; Martin Österling; Johan Watz; Stefán Óli Steingrímsson; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; burbot; climate change; cortisol; diel behaviour; gene expression; HPI axis; light; mRNA; piscivorous; poikilotherm; predator; salmonid; stream; stress; temperature; thermal; winter behaviour; Biology; Biologi;

   Sammanfattning : Temperature has major effects on the performance of poikilotherms. In encounters with predators, low winter temperatures constrain predator detection and escape capabilities in prey fishes. LÄS MER

4. 3. Individual variation in behaviour: personality and performance of brown trout in the wild

   Författare :Bart Adriaenssens; Göteborgs universitet; []
   Nyckelord :behavioural syndromes; personality; life-history; boldness; hatchery; survival; growth; foraging; anti-predator behaviour; learning; brown trout;

   Sammanfattning : Individuals from the same population often show very different behaviour. These differences, when consistent across time, are referred to as animal personality or behavioural syndromes. Explaining the occurrence of animal personality from an evolutionary perspective has however proven a difficult issue to tackle. LÄS MER

5. 4. Causes and consequences of individual variation in anti-predator traits

   Författare :Kaj Hulthén; Enhet akvatisk ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal migration; partial migration; individual differences; predator; personality trait; phenotypic plasticity; inducible defence; mortality risk;

   Sammanfattning : Predation imposes a potent evolutionary force on prey, moulding the evolution of traits and diversification of species, and can furthermore have powerful ecological consequences. We know that different species vary in how they cope with their natural enemies, and, consequently, a huge range of anti-predator defences are displayed in nature. LÄS MER

7. 5. Predator effects on behaviour and life-history of prey

   Författare :Tomas Brodin; Frank Johansson; Bradley Anholt; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; activity; behaviour; behavioural syndromes; damselfly; development; growth; life-history; predator-prey interaction; predation risk; thinning; Freshwater ecology; Limnisk ekologi;

   Sammanfattning : In this thesis I investigate predator-induced effects on behavioural and life-history characteristics of prey. At any moment a given predator is capable of attacking a small number of prey. LÄS MER