Sökning: "animal behaviour"

Visar resultat 21 - 25 av 194 avhandlingar innehållade orden animal behaviour.

  1. 21. The Evolution of Sexually Homologous Ornaments : Selection via Male Mate Choice Coinciding with Male-Male Competition in a Neotropical Mosquito

    Författare :Sandra South; Göran Arnqvist; Russell Bonduriansky; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sexual selection; Sabethes cyaneus; Diptera; Culicidae; mosquito; mutual ornamentation; sexual selection; mutual mate choice; male mate choice; female ornament; ecology; animal behaviour; Ethology and behavioural ecology; Etologi och beteendeekologi; Animal Ecology; Zooekologi;

    Sammanfattning : The evolution of elaborate male ornaments via sexual selection is well-understood while the selective pressures acting on female ornaments remains unresolved. Female ornaments in species with strong sexual selection on the male homologue of the ornament were originally thought to result from an intersexual genetic correlation. LÄS MER

  3. 22. Round goby invasion of the Baltic Sea : the role of phenotypic variation

    Författare :Magnus Thorlacius; Tomas Brodin; Göran Englund; Jost Borcherding; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Round goby Neogobius melanostomus ; behaviour; animal personality; dispersal; species invasions; colonisation; spread; sociability; activity; boldness; aggression; cortisol coping-styles; biology; biologi;

    Sammanfattning : Biological invasions are a major threat to biodiversity world wide with annual economic costs up to 1.4 trillion dollars. The round goby (Neogobius melanostomus) is a particularly fierce invader that threatens ecological function of the Baltic Sea. LÄS MER

  4. 23. Pigs for organic production : studies of sow behaviour, piglet-production and GxE interactions for performance

    Författare :Anna Wallenbeck; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  5. 24. Ley crop silage in diets to fattening pigs : How does it affect pig performance, nitrogen utilization, health and behaviour?

    Författare :Johanna Friman; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : There is an increasing interest to use silage as a feed ingredient to pigs. The aim of this thesis was to study the effect of using silage in the diet to fattening pigs and how feeding strategy influenced pig performance, behaviour, gut health and nitrogen utilization. Two studies were performed. LÄS MER

  7. 25. Behaviour under predation risk in birds

    Författare :Cecilia Kullberg; Neil B Metcalfe; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal physiology; Zoofysiologi;

    Sammanfattning : Predation is a major selective force in the evolution of both morphological and behavioural characters in animals. The flexibility in behavioural traits according to perceived predation risk has received much attention in recent years. LÄS MER